The EPC certificate London landlords rely on is about to matter more than ever. The government has signalled that minimum energy efficiency standards for rental properties will tighten, and London’s housing stock includes a disproportionately high share of older, energy-inefficient properties. This guide covers what the current rules require, what is changing, and what London landlords should do now to stay compliant and protect their rental income.

The Current Minimum EPC Rating for London Rentals

All privately rented properties in England, including London, must have a valid EPC certificate with a minimum rating of E before a tenancy can begin. This requirement has been in place since 2018 for new tenancies and since 2020 for all existing tenancies.

If your London rental property currently has an F or G rating, you cannot legally let it without first improving the rating or registering a valid exemption. The Minimum Energy Efficiency Standards (MEES) regulations enforce this, and local authorities can issue civil penalties of up to £30,000 for non-compliance.

What Is Changing: The Move Toward EPC C

The government has proposed raising the minimum EPC rating for new tenancies to C by 2028 and for all tenancies by 2030. These dates have shifted several times, so landlords should check the current timeline with the government’s official guidance. However, the direction of travel is clear. In practice, most London landlords who own older properties will need to carry out improvement work to comply.

London presents a particular challenge in this regard. A large proportion of London rental properties are Victorian and Edwardian conversions with solid walls, single-glazed windows, and older heating systems. These properties typically sit at EPC D or below without intervention.

How to Improve Your EPC Certificate London Rating

The fastest ways to improve an EPC rating in a London rental property are loft insulation, wall insulation, and boiler replacement. Of these, wall insulation delivers the largest single improvement for solid-walled properties.

For properties with cavity walls, cavity wall insulation is quick, affordable, and often funded through ECO4. For solid-walled properties, internal or external wall insulation is required. Costs range from £4,000 to £15,000 depending on the method, but ECO4 funding may cover part or all of this for eligible tenants.

Our sister site wallinsulation.co.uk covers all wall insulation options and grants in detail, including the routes available to London landlords with solid-walled properties.

The Cost of an EPC Certificate in London

An EPC assessment in London typically costs between £60 and £120 depending on the size and complexity of the property. London assessors tend to charge more than the national average due to higher operating costs and travel time. However, the certificate is valid for ten years, which makes the annual cost minimal.

For landlords with multiple properties, bulk assessment rates are often available. Contact us for a quote covering your full portfolio.

How Quickly Can You Get an EPC Certificate in London?

Most London assessors can carry out an assessment within two to five working days of booking. In urgent cases, same-day or next-day assessments are sometimes available. The certificate is lodged on the official government register within 24 hours of the assessment, which means you can provide it to prospective tenants almost immediately.

For the government’s official register where you can verify any existing EPC certificate, see: https://find-energy-certificate.service.gov.uk

EPC Exemptions for London Landlords

If you cannot achieve the minimum EPC rating despite making all cost-effective improvements, you may be able to register an exemption. Valid grounds for exemption include cases where the cost of improvements exceeds the current cap, where a tenant refuses access for improvement works, or where planning restrictions prevent the required works.

Exemptions must be registered on the PRS Exemptions Register. They are valid for five years and do not remove the obligation to improve the property when the exemption expires. For full guidance on exemptions, the government provides detailed information here. 

Book Your EPC Certificate in London Today

Whether you need a new EPC certificate for a London property, want to understand your options for improving your rating, or are managing a portfolio across multiple boroughs, contact us today. We arrange qualified London assessors, fast turnaround, and certificates lodged on the official register the same day.

The commercial EPC certificate cost is higher than a domestic EPC, and for good reason. Commercial and domestic EPCs are fundamentally different assessments. They use different methodologies, require different qualifications, and serve different legal purposes. This guide explains the key differences so you know what to expect before you commission either type.

What Is a Domestic EPC?

A domestic EPC assesses the energy performance of a residential property. The assessor visits the property, records details about the construction, insulation, heating system, and glazing, and uses government-approved software to produce a rating from A to G.

Domestic EPCs are required when you sell or let a residential property in England. The assessment typically takes 30 to 60 minutes for a standard home. The cost ranges from £60 to £120 depending on property size and location.

What Is a Commercial EPC?

A commercial EPC, also known as a non-domestic EPC, assesses the energy performance of a commercial building. This includes offices, shops, warehouses, hotels, schools, and any building that is not used as a dwelling.

The commercial EPC certificate cost is higher because the assessment is considerably more complex. Commercial buildings vary enormously in size, use, and mechanical systems. As a result, the assessment requires a Level 3, 4, or 5 qualified assessor depending on the building type, and the methodology used is entirely different from the domestic approach.

How Commercial EPC Certificate Cost Compares to Domestic

For a small commercial property such as a single office unit or retail shop, the commercial EPC certificate cost typically starts at £150 to £300. For larger or more complex buildings, costs rise significantly. A medium-sized office building might cost £400 to £800. A large industrial unit or mixed-use development can cost £1,000 or more.

By comparison, a domestic EPC for a two-bedroom flat costs £60 to £90 in most parts of England. The commercial EPC certificate cost reflects the additional time, specialist software, and higher qualification level required.

Key Differences Between Commercial and Domestic EPCs

• Legal requirement: Both types are required when selling or letting a property. However, commercial buildings above 500 square metres that are frequently visited by the public must also display the EPC in a prominent location.
• Assessor qualification: Domestic assessors hold a Level 3 qualification. Commercial assessors hold Level 3, 4, or 5 depending on building complexity. As a result, commercial assessors are harder to find and command higher fees.
• Methodology: Domestic EPCs use the Standard Assessment Procedure (SAP) or Reduced Data SAP (RdSAP). Commercial EPCs use the Simplified Building Energy Model (SBEM) or dynamic simulation modelling for complex buildings.
• Validity: Both domestic and commercial EPCs are valid for ten years.
• Recommendations: Both types include a recommendations report. However, commercial recommendations tend to focus on building services, lighting, and controls rather than fabric improvements.

When Do You Need a Commercial EPC?

You need a commercial EPC when you sell or let a commercial property in England. Furthermore, you need one when a building is newly constructed or undergoes a material change of use. Public buildings above a certain size must also display a Display Energy Certificate (DEC), which is a separate but related document.

For the government’s full guidance on commercial EPC requirements, see here.

Can the Same Assessor Do Both Types?

No. A domestic assessor is not qualified to produce a commercial EPC. If you need both types for a mixed-use building, you will need separate assessors for the residential and commercial parts. This is common in properties with retail units on the ground floor and flats above.

For domestic EPC assessments across your portfolio, see our guide to finding your EPC certificate.

Our sister site ecoinsulation.co.uk covers external wall insulation options for commercial and mixed-use buildings looking to improve their EPC rating before a sale or lease renewal.

Get a Quote for Your Commercial EPC Today

Commercial EPC certificate cost varies by building type and complexity. Contact us today for a fast, accurate quote from a qualified assessor. We cover all commercial property types across England and lodge certificates on the official register the same day.

An EPC for rental property has never been more consequential than it is in 2026. The government’s Warm Homes Plan, published in January and described as the largest public investment in home upgrades in British history, places rental sector energy efficiency at the centre of its ambitions. At the same time, the 2030 EPC C deadline for privately rented homes has been confirmed, ECO4 is running down toward its December closure, and the new Warm Homes Local Grant is actively distributing funding through local councils. For landlords, understanding the EPC for their rental property is no longer a compliance formality. It is the starting point for a set of decisions that will determine whether their properties remain legally lettable in four years.

Every privately rented property in England and Wales is required to have a valid EPC before it is marketed or let. That requirement is not new. What is new in 2026 is the combination of a confirmed minimum standard, a closing window for funded support, and a penalty regime that makes non-compliance genuinely costly. Fines for failing to meet the EPC C requirement from October 2030 have been confirmed at up to £30,000 per property.

What an EPC for Rental Property Tells You

An Energy Performance Certificate rates a property on a scale from A to G, where A is the most energy efficient and G is the least. The rating reflects the calculated energy performance of the building based on its construction, insulation levels, heating system, hot water provision, ventilation, and lighting. The assessment is carried out by a qualified Domestic Energy Assessor using the Standard Assessment Procedure, known as SAP.

The certificate shows the current rating and the potential rating, which is the rating the property could achieve if all the recommended improvements listed in the certificate were carried out. The gap between the current rating and the potential rating tells you what the property is capable of with investment and what measures the assessor has identified as worth doing.

For landlords, the most important number on the EPC for their rental property in 2026 is the current rating. If it is C or above, the property already meets the 2030 requirement and the task is to maintain it. When it is D, the property is one band below the requirement and a targeted package of improvements will typically close the gap. If it is E, F, or G, the compliance challenge is more significant and the planning needs to start now.

The EPC also has a validity period of ten years. Landlords whose EPC was issued before 2017 should arrange a new assessment, not only because the certificate may have expired but because a new assessment will reflect any improvements made since the last one and will provide an updated recommended measures list that reflects current standards.

The Warm Homes Plan and What It Means for Rental EPC Improvement

The Warm Homes Plan is directly relevant to landlords trying to improve the EPC for their rental property. The plan allocates £15 billion to upgrading five million homes by 2030 and places insulation, heating system improvements, and clean energy measures at the centre of the programme. For rental properties specifically, the relevant strands are ECO4, the Warm Homes Local Grant, and the forthcoming Warm Homes Fund.

ECO4 remains active until 31 December 2026 and covers a range of energy efficiency measures including wall insulation, loft insulation, floor insulation, and heating system upgrades. Landlords whose tenants receive qualifying benefits and whose properties have an EPC rating of D or below may be eligible for fully funded improvements through this route. The tenant’s eligibility drives the ECO4 application, but landlords can facilitate the process and many ECO4 installers work directly with landlords to identify eligible properties in their portfolios.

The Warm Homes Local Grant, delivered through local councils, provides funded upgrades for low income households in less energy efficient homes. Eligibility varies by area but the scheme covers the same range of measures as ECO4 and in some areas is actively targeting rental sector properties. Landlords should contact the local councils for each area where they hold rental properties and ask specifically about the Warm Homes Local Grant and whether their properties or their tenants might qualify.

For landlords whose tenants do not meet the eligibility criteria for either funded scheme, the Warm Homes Fund is expected to offer low or zero interest loans for energy efficiency improvements later in 2026. This will provide a route to EPC improvement without requiring benefit status, which is particularly relevant for landlords with properties let at market rent to working households.

How to Prioritise Improvements for EPC Compliance:

• The recommended measures on an EPC are listed in order of cost effectiveness, but they are not always listed in the order that will have the greatest impact on the rating. A qualified retrofit assessor, working under PAS 2035, can produce a medium term improvement plan that sequences the measures most likely to move the property to EPC C within the available budget.
• For most D rated properties in the private rented sector, the compliance pathway involves insulation improvements to the walls, loft, and floor combined with heating system and controls upgrades. The combination of these measures, particularly in post-1945 properties with cavity walls and accessible loft spaces, is typically sufficient to reach C within the £10,000 cost cap that applies under the new rules.
• For properties at E or below, and particularly for solid wall properties where cavity fill is not an option, the compliance pathway is longer and more expensive. External or internal wall insulation, floor insulation, and potentially a new heating system may all be required. These properties need to be identified now, assessed now, and their improvement programmes started in 2026 to give realistic time for completion before October 2030.
• The EPC for a rental property is the document that tells you where you stand. In 2026, with funded support still available, the landlord deadline confirmed, and the Warm Homes Plan actively distributing money to improve the housing stock, reading that document carefully and acting on what it says is the most important thing a landlord can do right now.

Check your EPC

An EPC rating check in 2026 is not just an administrative task. For landlords with privately rented properties in England and Wales, it is the starting point for understanding their compliance position under one of the most significant pieces of housing regulation in a generation. The government confirmed in February 2026 that all privately rented homes must achieve a minimum EPC C by 1 October 2030. Fines for non-compliance reach up to £30,000 per property. With four years until the deadline, the window to plan, fund, and complete the necessary improvements is narrower than it appears, and it starts with knowing exactly what the current EPC rating check shows.

A rating check takes minutes. The government’s Find an Energy Certificate service lets any landlord enter a property address and retrieve the current EPC, the rating band, the SAP score, the recommended improvements, and the certificate’s validity date. For landlords with multiple properties, running an EPC rating check for each one and building a compliance matrix from the results is the most practical way to understand the scale of the task and prioritise where to act first.

What an EPC Rating Check Shows

The EPC rating check result contains more useful information than the headline band. The SAP score is the number behind the band and it tells you precisely how close or far the property is from the C threshold. A C rating begins at SAP 69. A property scoring 65 needs four SAP points to reach compliance. A property scoring 50 needs nineteen. That distinction shapes the complexity and cost of the improvement pathway entirely.

The recommended measures on the certificate are listed in order of cost effectiveness and each one shows the estimated SAP improvement it would deliver. A landlord who does an EPC rating check and then works through the recommended measures list with a competent retrofit assessor can quickly build a picture of which combination of measures reaches SAP 69 within the £10,000 cost cap and which properties will require a compliance exemption because the target is genuinely unachievable within that budget.

The validity date on the certificate is also worth checking. EPCs are valid for ten years. A certificate issued in 2015 or 2016 is approaching or at its expiry date, and any improvements made since the last assessment will not be reflected in the current rating. A new EPC assessment in these cases is worth commissioning even if the certificate has not yet formally expired, because the updated rating and the new recommended measures list will reflect the current state of the property and provide a more accurate picture of what is needed.

Reading the Result Against the 2030 Deadline:

• Once a landlord has carried out an EPC rating check for each of their properties, the results fall broadly into three categories that determine the urgency and nature of the response.
• Properties already at C or above are compliant for 2030. The task is to maintain the rating through any refurbishment works and to ensure that any changes to the heating system, insulation, or building fabric do not inadvertently reduce the SAP score below 69. A new EPC assessment after any significant works is good practice.
• Properties at D are one band below the threshold. These are the most common properties in the private rented sector and also the most straightforward compliance challenge. Most D rated properties can reach C through a targeted combination of cavity or solid wall insulation, loft insulation, and heating controls upgrades. Many of these measures remain fundable through ECO4 until December 2026 for eligible tenants, and through the Warm Homes Local Grant for qualifying households in council areas where the scheme is active.
• Properties at E, F, or G are the compliance priority. They have the furthest to travel, the most complex improvement pathways, and the greatest exposure to the £30,000 fine if they remain unimproved. They are also the properties most likely to qualify for the most substantial funded support through ECO4 and the Warm Homes Local Grant, precisely because the schemes target the least energy efficient homes. Running an EPC rating check and identifying these properties within a portfolio is therefore both the most urgent thing to do and the action most likely to unlock available funding.

How to Act on an EPC Rating Check Result in 2026

• The practical sequence after an EPC rating check is straightforward. For properties at D or below, contact an ECO4 approved installer and ask for a free eligibility check based on the rating and the tenant’s benefit status. If the household qualifies, the installer manages the rest of the process. For properties where tenants do not meet the ECO4 criteria, contact the local council for the area where the property sits and ask about the Warm Homes Local Grant. For properties where neither scheme applies, monitor the Warm Homes Fund for the low interest loan product expected later in 2026.
• For properties at E, F, or G where the compliance pathway requires multiple measures or solid wall insulation, instructing a PAS 2035 retrofit coordinator to produce a medium term improvement plan is the recommended next step. The plan sequences the measures in the correct order, identifies the funding routes for each one, and provides a realistic timeline for reaching EPC C before October 2030.
• The EPC rating check is the beginning of that process, not the end of it. Running the check takes two minutes. Acting on the result takes planning, funding, and time. The landlords who run their EPC rating check now and start that planning process in 2026 are the ones who will complete it comfortably before the deadline. Those who wait until 2028 or 2029 will be competing for installer capacity, paying higher prices as demand peaks, and running out of the time they need to manage works sensitively around existing tenants.

Check your EPC.

The average EPC rating UK properties carry on their certificates may no longer reflect how those properties are actually performing, and England’s record wet winter of 2025 to 2026 is making that gap wider. After rainfall ran 42% above the long term average according to the Met Office, with some areas recording their wettest winter since 1836, millions of homes are operating at a lower effective thermal performance than their EPC certificate assumes. Understanding why this happens, and what it means for your property, is increasingly important as the 2030 compliance deadline approaches.

The Average EPC Rating by Property Type

Government EPC data for England and Wales shows that the average EPC rating UK existing dwellings hold sits around band D, specifically in the low to mid D range, corresponding to a score of approximately 60 to 65 on the 1 to 100 scale.

This average conceals significant variation. New builds (post 2010) predominantly rate at B or C. Government statistics for Q3 2025 show 85% of new dwellings received an A or B rating. Post war housing (1945 to 1980) typically rates at C or D depending on what improvements have been made. Pre 1919 solid wall properties rate at E, F or G in unimproved form, and these are precisely the properties most vulnerable to the moisture effects of a wet winter.

The average EPC rating UK landlords need to achieve by 2030 is C. The gap between where much of the housing stock currently sits and where it needs to be is significant, and wetter winters are quietly making that gap harder to close.

Why the Average EPC Rating by Property Type Can Overstate Real Performance

An EPC rating represents modelled energy performance, not measured energy use. A Domestic Energy Assessor visits the property, records specific features, wall construction, insulation presence, glazing type, heating system, and enters this data into SAP calculation software. The software outputs a score and band.

The EPC records what is theoretically present in the property. It does not measure how that fabric is performing. And it does not account for the condition of insulation, the moisture content of walls, or the effective thermal resistance of materials that have absorbed water.

Water is a much better conductor of heat than air. When insulation absorbs water, whether cavity fill mineral wool saturated by moisture bridging, floor insulation in a wet subfloor void, or loft insulation dampened by eaves defects, its effective thermal resistance drops significantly. Wet mineral wool can lose 50% or more of its dry thermal resistance. The insulation is still physically present. The average EPC rating UK calculation still records it as present. But it is not delivering the performance the certificate assumes.

 

What the SHDF Data Shows About Real EPC Improvements

The most useful published dataset on real EPC improvement comes from the Social Housing Decarbonisation Fund (SHDF). The government’s December 2025 SHDF statistics show that almost 100% of households upgraded under Wave 2.1, those starting from EPC band D or below, reached band C or above following the programme of works. Wave 2.2 replicated this result, with 99% of upgraded households reaching C or above.

This data demonstrates that moving properties well below the average EPC rating UK holds, E, F and G rated homes, up to band C is achievable at scale. However, it also reflects a package approach where multiple measures are installed together. A property that holds the average EPC rating UK properties sit at, band D, may need fewer measures but still requires accurate diagnosis of which measures deliver the most improvement.

Which Properties Are Most at Risk From Wet Winter Performance Degradation

Not all properties face equal risk from wetter winters degrading their effective thermal performance below the average EPC rating UK calculation assumes.

Properties with older cavity wall insulation. Mineral wool installed in the 1980s or 1990s that has settled or been exposed to previous moisture events carries greater risk of performance degradation in a wet winter than recently installed EPS bead systems.

Solid wall properties without EWI. Solid walls that have absorbed months of sustained rainfall are losing heat faster than their notional U values suggest.

 

Properties with suspended timber floors above poorly ventilated voids. Elevated void moisture means wet ground and potentially wet joist surfaces, both of which conduct heat more readily than dry equivalents.

 

Why This Spring Is the Right Time for a New EPC Assessment

Getting a new EPC assessment this spring serves two practical purposes for homeowners and landlords whose properties fall below or near the average EPC rating UK target of C.

First, it establishes an accurate current baseline under RdSAP 10, the updated methodology introduced in June 2025. Properties assessed before this date used the old RdSAP 9.94 methodology. Some property types, particularly solid brick properties with walls thicker than 280mm, may score differently under the new methodology.

Second, it triggers an up to date recommended improvements table. For landlords planning improvements to reach C before the 2030 deadline, an accurate 2026 baseline is more useful than a certificate issued several years ago before this winter’s rainfall tested the building fabric.

For detailed guidance on EPC bands, what the ratings mean, and how RdSAP 10 changed the methodology, read here 

 

Frequently Asked Questions

What is the average EPC rating UK properties hold?

The average for existing dwellings in England and Wales is approximately D, in the range of 60 to 65 on the 100 point scale. New builds average B.

Does a wet winter automatically lower my EPC rating?

No. Your EPC certificate does not update based on weather conditions. However, your property’s real world thermal performance may fall below what the certificate assumes if insulation has been degraded by moisture this winter.

How can I tell if this winter has affected my insulation performance?

A thermal imaging survey of the internal walls in cold conditions reveals cold spots and areas of reduced insulation performance. A borescope inspection of the cavity can confirm whether cavity insulation is wet or degraded.

Should the average EPC rating UK holds be higher by now?

The average EPC rating UK properties hold has improved significantly over the past two decades through insulation programmes, glazing upgrades and heating improvements. However, the pace of improvement needs to accelerate to meet the government’s targets, and maintaining that improvement through increasingly wet winters requires resilient insulation materials and correctly specified systems.

 

Met Office climate projections available at metoffice.gov.uk

An EPC assessment booked this spring, after England’s record wet winter, gives homeowners and landlords something that many current certificates cannot: an accurate picture of where their property actually stands. After the wettest winter England has recorded in years — with rainfall running 42% above average according to the Met Office and some areas seeing rain on 41 consecutive days — the gap between what an old EPC assumes and what a property’s fabric is actually delivering has never been wider.

 

Why This Spring Is a Particularly Critical Moment

Three factors make spring 2026 an unusually important time to get an EPC assessment, even for properties that already have a valid certificate.

 

The building fabric has just been tested by extreme conditions. The winter of 2025 to 2026 was England’s eighth wettest on record. Cavity insulation, floor insulation, loft insulation, and the walls and mortar of millions of properties have been exposed to sustained saturation unlike anything seen in recent years. An assessment done now — while the effects of that saturation are still visible to an experienced assessor — captures an accurate current state.

 

The methodology changed in June 2025. RdSAP 10, introduced in June 2025, updated the way EPC assessors calculate ratings for existing homes. Properties assessed before this date used the old RdSAP 9.94 methodology. Some property types — particularly solid brick properties with walls thicker than 280mm — may score differently under the new methodology. If your certificate predates June 2025, a new assessment under RdSAP 10 may produce a different rating.

 

The 2030 landlord compliance deadline is approaching. Landlords must achieve EPC band C for all tenancies by 1 October 2030. A property assessed in spring 2026 and found to be at D 62 has a clear roadmap to C. A property operating from a certificate issued in 2019 under the old methodology may have an inaccurate baseline that leads to poorly targeted investment.

 

Who Specifically Needs an EPC Assessment This Spring

Landlords Planning Improvements

If you are a landlord planning insulation or heating improvements to reach EPC C before 2030, a current assessment under RdSAP 10 is the correct starting point. The recommended improvements table on a 2026 certificate reflects the current methodology, current U value assumptions for your wall type, and the current SAP weighting of each measure.

 

Investing in improvements guided by a certificate from 2021 means your improvement plan may be based on inaccurate starting assumptions. The same money spent guided by a current certificate typically delivers a more efficient route to C.

Properties With Cavity Insulation Installed Before 2000

Older mineral wool cavity insulation that has settled, degraded, or been affected by moisture over multiple wet winters may not be delivering the performance assumed in the existing EPC. Under RdSAP 10, an assessor who can evidence the current condition of the insulation records the accurate state rather than the theoretical state. If your cavity insulation has been investigated and found to be degraded, a new assessment captures this and produces an accurate baseline for improvement planning.

Solid Brick Properties

Solid brick properties with walls thicker than 280mm may score better under RdSAP 10 than under the previous methodology, because the updated default U value for thick solid brick walls is 1.4 W/m²K rather than the previous 2.1 W/m²K. If your property has thick solid brick walls and your existing certificate predates June 2025, a new assessment may produce a higher rating without any physical improvements to the property.

Properties Close to the D to C Boundary

If your property currently holds a D rating anywhere from 55 to 68, and you or a previous owner have made improvements since the last assessment — loft insulation top up, a new boiler, double glazing, solar panels — a new assessment is very likely to produce a higher score. Even without improvements, a solid brick property may rate higher under RdSAP 10.

 

For a property at D 65 or above, a new assessment alone — reflecting documented improvements and the updated methodology — may be enough to secure band C without any further work.

 

What Happens During a Spring EPC Assessment

An EPC assessment takes 30 to 60 minutes for a standard domestic property. Under RdSAP 10, the assessor uses an evidence hierarchy that prioritises documented performance over default assumptions. Gathering your paperwork before the assessor arrives makes a real difference to the outcome.

 

Bring out documentation for:

 

Boiler make, model, and installation certificate. The manufacturer’s efficiency rating, if evidenced, produces a more accurate score than a default assumption.

 

Loft insulation depth and installation records. If loft insulation was installed or topped up since the last assessment, a completion certificate or dated invoice allows the assessor to record the current depth accurately.

 

Cavity or wall insulation certificates. Any installation completed under a government scheme should have a completion certificate. This is the evidence the assessor needs to record the insulation as present.

 

Window installation records. FENSA certificates for double or triple glazing installed since the last assessment allow the assessor to record the correct glazing specification.

 

Solar panel MCS certificates. Photovoltaic panels are recorded based on system size and specification. The installation certificate provides this information.

 

The assessor also observes:

 

Wall construction and thickness — relevant to the RdSAP 10 U value revisions for solid brick properties.

 

Heating system controls — programmers, thermostats, and thermostatic radiator valves all contribute to the rating.

 

Hot water cylinder insulation — an uninsulated cylinder records differently from an insulated one.

 

The Cost of Getting an EPC Assessment

A domestic EPC assessment costs approximately £60 to £120 in 2026, depending on property size, assessor availability, and location. For a landlord with a portfolio of properties, volume rates may apply.

 

This is a modest cost relative to the value of the information it produces. A landlord who spends £10,000 on improvements based on an inaccurate 2019 baseline may not reach the C rating they need and face additional expenditure. The same landlord working from a £90 assessment conducted in May 2026 has accurate information and an efficient improvement plan.

 

The 2027 Home Energy Model: Another Reason to Act Now

The government is developing the Home Energy Model (HEM) as a replacement for the current SAP and RdSAP framework. HEM is expected from late 2027 and will introduce four headline metrics — fabric performance, heating system, smart readiness, and energy costs — rather than the current single band rating.

 

EPC certificates issued under the current methodology remain valid for 10 years. A property that achieves a valid EPC C under RdSAP 10 before October 2029 locks in current methodology compliance for up to 10 years — avoiding the more demanding dual metric requirements that HEM will introduce.

 

Getting an accurate assessment this spring, followed by targeted improvements to reach C, is therefore not just useful for current planning. It is the most efficient route to securing long term compliance before the goalposts change in 2027.

 

For detailed guidance on what each EPC band means and how the RdSAP 10 changes affect your rating, visit our guide to EPC band ratings explained.

 

Frequently Asked Questions

Do I legally need a new EPC after a wet winter? No. A valid EPC certificate remains valid for 10 years regardless of weather conditions. However, commissioning a voluntary new assessment is sensible if your certificate predates June 2025, if significant improvements have been made since the last assessment, or if you are planning improvement works and need an accurate baseline.

 

Will a new assessment always produce a better result? Not necessarily. If insulation has been degraded by this winter’s moisture and the assessor records this accurately, the new rating may be lower than the existing certificate. However, an accurate lower rating is more useful than an optimistic one when planning improvements.

 

How do I find an accredited assessor? Search the national EPC Register at epcregister.com, or contact an accreditation body such as Elmhurst Energy, Stroma, or ECMK. Always verify accreditation before booking.

 

Can I get a new EPC assessment if my tenants are in the property? Yes. The assessor needs access to all rooms, the loft, and the heating system, but does not need the property to be vacant. Give tenants advance notice of the assessment and explain what it involves.

 

What if my property cannot reach C even after improvements? If the cost of reaching C exceeds £10,000 and no grant funding covers the balance, a cost cap exemption can be registered on the PRS Exemptions Register. The exemption requires evidence that all available improvements have been made within the cost cap. Always exhaust grant funding options first — ECO4 and GBIS may fund measures that bring the cost within the cap.

 

Met Office winter 2025 to 2026 seasonal data published March 2026. RdSAP 10 methodology information from DESNZ published guidance, June 2025. The national EPC Register for England and Wales is available at epcregister.com.

 

If you had an EPC assessment before June 2025 and are now getting a new one, the score may be different from what you expected, even if nothing has changed about the property. On 15 June 2025, the methodology used to calculate EPC ratings for existing homes in England and Wales changed from RdSAP 9.94 to RdSAP 10. This was the most significant update to the EPC assessment methodology in over a decade, and it affects how some properties score, how assessors collect information, and what documentation homeowners need to provide.

 

EPC band ratings explained: What EPC Bands Mean and How They Are Calculated

An EPC rates a property on a scale of 1 to 100, divided into seven bands:

 

Score	Band
92 to 100	A
81 to 91	B
69 to 80	C
55 to 68	D
39 to 54	E
21 to 38	F
1 to 20	G

 

The score calculates using the Standard Assessment Procedure (SAP) for new buildings and the Reduced Data SAP (RdSAP) for existing homes, “reduced” because an assessor visiting an existing building collects a defined set of data points rather than the full design specifications available for new construction.

 

The score represents the estimated energy cost of heating, lighting, and hot water for the property under standard occupancy assumptions. It does not reflect actual energy use, which varies with occupant behaviour, the number of people in the property, and energy tariffs.

 

What RdSAP 10 Changed

The June 2025 update made changes across several areas of the assessment methodology. The most significant for homeowners and landlords are:

Evidence Based Assessment Replaces Default Assumptions

Under the previous methodology (RdSAP 9.94), assessors frequently relied on default assumptions when specific information was unavailable. For example, if the make and model of a boiler could not be verified, the system used a default efficiency figure, often lower than the actual boiler’s performance. If insulation was present but the installer certificate was unavailable, the assessor might not be able to record it accurately.

 

RdSAP 10 introduces a hierarchy that prioritises actual evidence over assumptions. An assessor who can verify the boiler model and manufacturer data uses the actual efficiency figure. An assessor who cannot provide evidence uses a lower default that reflects the uncertainty.

 

The practical consequence for property owners is that documentation matters more under RdSAP 10 than it did before. Keeping records of:

 

• Boiler make, model, and installation date
• Insulation certificates or building regulations completion certificates
• Window installation certificates showing glazing type and installation date
• Solar panel installation records

 

These documents allow an assessor to use better performance data in the calculation, which can meaningfully affect the score.

Revised U Values for Solid Walls

The previous methodology used a fixed default U value of 2.1 W/m²K for solid brick walls, applied regardless of the actual wall thickness. RdSAP 10 introduces a step change for solid brick walls: properties with walls thicker than 280mm now receive a default U value of 1.4 W/m²K rather than 2.1 W/m²K.

 

This change is based on evidence from research showing that the actual U value of UK solid walls is on average closer to 1.3 W/m²K than the previously assumed 2.1 W/m²K. The revision makes EPCs more accurate for solid wall properties, but it also means that some solid brick properties score slightly better than they did under the previous methodology, purely from the methodology change, with no physical improvement to the building.

 

For solid stone walls, sandstone, limestone, and granite, RdSAP 10 also provides revised U values, with slightly more generous figures for the thick stone walls typical of older Scottish and northern English construction.

Improved Handling of Flats and Terraced Properties

Previous versions of RdSAP applied default assumptions about heat loss through party walls and shared floors and ceilings that could understate the performance of mid floor flats and mid terrace properties. RdSAP 10 adjusts these calculations, which may result in improved scores for some flat and terrace properties even without any physical changes.

Heating System Evidence Requirements

The RdSAP 10 hierarchy requires assessors to record the specific make and model of heating systems where this can be verified. Smart heating controls, programmers, thermostats, and thermostatic radiator valves, are captured more accurately where the assessor can confirm their presence.

 

For properties with heat pumps, RdSAP 10 captures more detail about the specific heat pump model and its Seasonal Coefficient of Performance (SCOP), which affects the score more precisely than the previous methodology’s more generalised treatment of heat pump installations.

 

How Your Score May Have Changed

Some property types are more affected by the RdSAP 10 changes than others:

 

Solid brick properties with walls over 280mm thick, these properties may score slightly better under RdSAP 10 due to the revised U value, even with no physical improvement.

 

Properties with documented improvements, where the owner can provide installer certificates and documentation, the assessor can record better performance data, producing a more accurate (and often higher) score than under a default assumption methodology.

 

Flats and terraced houses, the revised heat loss assumptions for shared elements may produce modestly improved scores.

 

Properties with unverified heating systems, where a boiler’s details cannot be confirmed, the new methodology may apply a lower efficiency default than before, potentially producing a worse score for the same boiler.

 

EPC band ratings explained: What Homeowners Should Do Before a New Assessment

Given the evidence requirements under RdSAP 10, prepare for any new assessment by gathering:

 

Boiler documentation. The installation certificate from when the boiler was installed, or at minimum the make, model, and installation year. If the current boiler replaced an original system, the replacement paperwork is what matters.

 

Insulation records. Building regulations completion certificates for any insulation installed since 2002. Installer certificates from loft, wall, or floor insulation installed under government schemes. Even a dated invoice from an insulation company is better than nothing.

 

Window installation records. FENSA certificates or equivalent for double or triple glazing installed since 2002. These confirm the glazing type and installation date.

 

Solar panel records. The installer certification and any MCS (Microgeneration Certification Scheme) documentation for solar PV or solar thermal.

 

Heat pump documentation. The make, model, and SCOP figure from the installation certificate.

 

An assessor working from good documentation produces a more accurate assessment than one working from default assumptions. For some properties, the difference between a documented and an assumed assessment can be several EPC points, enough to cross a band boundary.

 

The Next Methodology Change: Home Energy Model from 2027

RdSAP 10 is not the last change coming. The government is developing the Home Energy Model (HEM) as a replacement for the current SAP and RdSAP framework. HEM is expected to be ready in the second half of 2027.

 

Under HEM, domestic EPCs will move to four new headline metrics: fabric performance, heating system performance, smart readiness, and energy costs. The single band rating from A to G will be supplemented with these additional metrics.

 

The implications for properties currently rated C are significant. A property that achieves C under RdSAP 10 may score differently under HEM if its heating system changes how it is assessed. The government has confirmed that EPCs issued under the current methodology will remain valid for 10 years, so an EPC C obtained before HEM takes effect will not automatically require reassessment.

 

Homeowners and landlords who achieve a valid EPC C before October 2029 under the current methodology lock in compliance for up to 10 years, avoiding the more demanding HEM requirements during that period.

 

EPC band ratings explained: Frequently Asked Questions

Why is my new EPC score different from my old one when nothing has changed? The RdSAP 10 methodology change may have affected your score. Solid brick properties with thick walls, terraced properties, and flats may all see changes due to revised calculation assumptions. Changes in documented evidence, either better documentation producing a higher score or less documentation producing a lower one, also explain differences between assessments.

 

Does RdSAP 10 make it easier or harder to achieve an EPC C? It depends on the property. Solid brick properties with thick walls may find it slightly easier due to the revised U value. Properties where the owner cannot provide boiler or insulation documentation may find the new evidence hierarchy means their score is lower than a previous assessment that used more generous defaults.

 

Is an EPC from before June 2025 still valid? Yes. EPCs remain valid for 10 years from the date of issue, regardless of methodology changes. A certificate from 2018 is valid until 2028 for the purpose of a sale or letting. However, it does not reflect RdSAP 10 and may not accurately represent the property’s performance under the current methodology.

 

Do I need a new EPC because of RdSAP 10? Not unless your existing certificate has expired or you are undertaking a transaction that requires a current certificate. If you are planning improvements and want an accurate baseline, commissioning a new assessment under RdSAP 10 gives you a starting point that reflects the current methodology.

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Information correct as of April 2026. EPC methodology continues to evolve, monitor government guidance for the transition to the Home Energy Model from 2027.

 

Average EPC rating UK by property type: Understanding how EPC ratings distribute across the UK housing stock. Read on to find out  which improvement measures move properties between bands, matters for homeowners planning improvements, landlords facing the 2030 compliance deadline, and anyone trying to understand what their current rating actually means. The data from government published sources provides a clear picture of where the UK housing stock stands and what the evidence shows about effective interventions.

 

Where the UK Housing Stock Sits Today

Government EPC data for England and Wales, published through the EPC Register, shows that the average EPC rating for existing dwellings sits around band D, specifically in the low to mid D range, corresponding to a score of approximately 60 to 65 on the 1 to 100 scale.

 

This average conceals significant variation by property type, age, and tenure:

 

New builds (post 2010), the overwhelming majority rate at B or C. Government statistics for Q3 2025 show that 85% of new dwellings received an A or B rating, reflecting the progressive tightening of building regulations over the past two decades.

 

Post war housing (1945 to 1980), typically rates at C or D, depending on what improvements have been made. Cavity walls filled and loft insulated push these properties to the C boundary. Unimproved, they sit solidly in D.

 

Victorian and Edwardian properties (pre 1919): solid wall construction, single glazing, and older heating systems combine to produce E, F, or G ratings in unimproved form. These properties are the ones the government’s retrofit programmes primarily target.

 

Private rented sector: data from the 2024 English Housing Survey identifies private rented households as having the highest rates of fuel poverty of any tenure type in England, which correlates with a concentration of lower EPC rated stock in this sector.

 

The Social Housing Decarbonisation Fund: Before and After Evidence

The most useful published dataset on EPC improvement from specific interventions comes from the Social Housing Decarbonisation Fund (SHDF). The government’s December 2025 SHDF statistics provide specific before and after EPC data for tens of thousands of upgraded properties.

 

The headline finding is striking: almost 100% of households upgraded under SHDF Wave 2.1, those starting from EPC band D or below where pre and post installation data was available, reached band C or above following the programme of works. This was replicated across Wave 2.2, where 99% of upgraded households reached C or above.

 

This data reflects a package approach, multiple measures installed together rather than a single intervention. However, it demonstrates clearly that moving a poorly rated property to band C or above is achievable at scale when the right combination of measures is applied.

 

The measures installed under the SHDF were predominantly insulation measures, which accounted for 52% of all measures under Wave 2.1. Solid wall insulation (both external and internal) and other insulation measures including roof and floor insulation made up the majority of this share, alongside electricity related measures (22%) and windows and doors upgrades (16%).

 

What Individual Measures Contribute to an EPC Score

The EPC score is calculated using the Standard Assessment Procedure (SAP), which weights measures by their contribution to the overall energy demand and carbon output of the property. The contribution of each measure varies by property type, but some broad patterns hold:

Loft Insulation

Upgrading from no insulation to 270mm significantly reduces the calculated heat loss through the roof. The EPC impact is typically 5 to 15 points, with larger impacts on detached properties with a proportionally larger roof area. Loft insulation is usually the highest impact per pound spent measure available for an unimproved property.

Cavity Wall Insulation

Filling an unfilled cavity wall typically adds 8 to 20 points to the EPC score, depending on the property type and what other measures are present. For a solid brick semi the calculation is different, there is no cavity to fill, but for the majority of post 1930 properties with unfilled cavities, this is one of the most cost effective EPC improvements available.

Solid Wall Insulation (External or Internal)

The EPC impact of solid wall insulation depends heavily on how much exposed external wall the property has. A detached property with four external elevations sees a much larger improvement than a mid terrace with only front and rear.

 

Published data from the London EPC practice provides a worked example: a 100 year old solid brick end of terrace property rated F31 moved to D55 following solid wall insulation to a U value of 0.30 W/m²K, a 24 point improvement. The same property with additional insulation to a U value of 0.22 moved only one further point to D56, illustrating that there is a point of diminishing returns beyond building regulations compliance.

 

For detached solid wall properties, improvements of three EPC bands, for example E to B, are possible from solid wall insulation combined with other measures.

Heating System Upgrade

Replacing an old G rated gas boiler with a modern A rated condensing boiler adds around 3 to 8 points. A move to an air source heat pump produces a larger improvement in the current SAP methodology because heat pumps use electricity, which SAP weights more favourably than gas on a carbon basis.

 

However, from 2027 the new Home Energy Model (HEM) will introduce a different assessment methodology. Under HEM, heat pump performance is assessed differently and properties currently rated C on a gas boiler may see their rating change. Homeowners planning improvements ahead of this change should be aware that the methodology itself is moving.

Double Glazing

Moving from single glazed to double glazed windows typically adds 2 to 8 points. There may be larger impacts on properties with more glazing area. The marginal improvement from double to triple glazing is considerably smaller and rarely the most cost effective next step.

Solar Photovoltaic Panels

A 2 to 4kWp solar PV system adds approximately 10 to 20 points to the EPC score under the current methodology. Solar PV is therefore one of the highest impact individual measures for EPC score improvement, particularly on properties where fabric improvements alone leave the rating below C.

 

The 39% Who Moved Up a Band

Analysis by Hamptons of Ministry of Housing, Communities and Local Government data found that between January and August 2024, 39% of rental homes with new EPC assessments moved into a higher band compared to their previous certificate. More than one in 10 (13%) dropped into a lower band, while 48% saw no change.

 

This data reflects a housing stock in active transition, with a significant minority of landlords and homeowners making improvements between EPC cycles. Over half of rental properties assessed in this period had a rating of C or higher.

 

The government estimates that up to 4% of rental properties will not be able to achieve a minimum EPC rating of C regardless of investment. Typically, the most technically constrained properties including some listed buildings and properties in specific conservation areas.

 

What This Means for Your Property

The national data provides useful context but property level performance depends on the specific construction, existing measures, and what the EPC assessor has recorded. The practical starting point for any homeowner or landlord planning improvements is their existing EPC certificate, specifically:

 

The current score and band. Where do you actually sit on the scale?

 

The potential score. What does the EPC assessor calculate the property could achieve if all recommended measures were implemented?

 

The recommended improvements table. Which measures does the assessor identify, what is their estimated impact, and in what order should they be implemented?

 

The gap to C. If the current rating is D 65 and the potential is C 72, you need 3 points. If the current rating is E 45 and the potential is C 74, you need 29 points. The measures required are very different.

 

An EPC that is more than five years old may not reflect recent improvements or the updated RdSAP 10 methodology introduced in June 2025. If you are planning improvements based on an old EPC, commissioning a new assessment first gives you an accurate baseline.

 

Frequently Asked Questions

What is the average EPC rating in the UK? The average for existing dwellings in England and Wales is approximately D, in the range of 60 to 65 on the 100 point scale. New builds average B.

 

What percentage of homes have an EPC rating of C or above? Over half of rental properties assessed in 2024 rated C or above, according to Hamptons analysis of government data. The proportion varies significantly by tenure and property age. New builds are predominantly A or B, while pre 1919 solid wall properties are predominantly E, F, or G unless improved.

 

Which measures move an EPC rating the most? Solid wall insulation on a detached property, solar PV, and heat pump installation typically deliver the largest individual score improvements. Loft insulation delivers the best impact per pound spent for unimproved properties. The optimal combination depends on the specific property.

 

Does the SHDF data apply to privately owned homes? The SHDF targeted social housing, so the properties and measures differ from the typical private owner occupier or landlord scenario. The before and after band improvement data is indicative of what is achievable with a comprehensive package of measures but. However, this should not be taken as a direct prediction for any individual property.

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Statistics and scheme data correct as of April 2026. EPC methodology is subject to change under the Home Energy Model from 2027, monitor government guidance for updates.

An EPC is valid for 10 years but a new EPC assessment before then may be a good idea. If yours has not expired, you are not legally required to get a new one, but there are specific situations where commissioning a new assessment makes real financial and practical sense. There are also situations where it is a waste of money. This guide helps you work out which category you are in.

 

When You Have No Choice: Legal Requirements

Before getting to the question of whether you should get a new assessment, confirm whether you legally need one.

 

You must have a valid EPC when:

 

Selling your property. An EPC must be commissioned and available before a property is marketed for sale. If your existing EPC has expired, more than 10 years since it was issued, you need a new one.

 

Letting a property. Landlords must have a valid EPC before marketing a rental property to tenants. The EPC must show a rating of E or above (or a registered exemption). If your rental EPC has expired or the property has never had one, you need a new assessment.

 

A newly built or substantially altered property. New builds require an EPC as part of building regulations sign off.

 

Check the EPC Register at epcregister.com. Enter the property address and you will see whether a valid EPC exists, when it was issued, and when it expires. Any property that has been on the register within the last 10 years does not legally need a new assessment for a sale or letting, as long as the circumstances covered in the register certificate still broadly apply.

 

When a New Assessment Is Worth Getting Voluntarily

You Have Made Significant Improvements Since the Last Assessment

An EPC captures the property at the time of assessment. If you have installed loft insulation, cavity or solid wall insulation, double glazing, a new boiler, solar panels, or underfloor heating since the last certificate was issued, none of these improvements are reflected in your existing EPC.

 

This matters for several reasons:

 

The EPC may understate your property’s performance. A rating of E on an old certificate for a property that now has full loft insulation, a new boiler, and double glazing is inaccurate. The actual rating is probably C or D.

 

A higher rating can affect your mortgage or sale price. Lenders increasingly factor EPC ratings into mortgage product availability. Some green mortgage products offer preferential rates for A or B rated properties. A more accurate certificate may open better financing options.

 

For landlords, a higher rating affects compliance status. If an existing certificate shows E or below but improvements since that assessment would now produce a D or C, a new certificate demonstrates compliance with MEES without the need for an exemption.

 

The question is how confident you are that the improvements would produce a meaningfully better rating. If you have replaced windows, topped up the loft, and installed a new boiler since a D certificate was issued, a new assessment will almost certainly show C. If you have done relatively minor work, the improvement may not cross a band boundary.

 

A scenario analysis from an experienced EPC assessor, asking them to estimate the likely rating given the improvements made, can help you decide whether a new assessment is worth commissioning before paying for it.

Your EPC Was Issued Before June 2025

The RdSAP 10 methodology update in June 2025 was the most significant change to EPC calculations in over a decade. Properties assessed under the previous methodology (RdSAP 9.94) may score differently under RdSAP 10, higher or lower depending on their characteristics.

 

Properties likely to score better under RdSAP 10:

 

• Solid brick properties with walls thicker than 280mm (revised U value assumption)
• Mid floor flats and mid terrace properties (revised heat loss assumptions for shared elements)
• Properties where documentation of improvements is now available that was not available at the previous assessment

 

Those that may score differently (not necessarily worse):

 

• Properties where the previous assessor used generous default assumptions that RdSAP 10 no longer permits
• Properties where the heating system details could not be verified and the new methodology applies a lower default

 

If your property falls into one of the categories likely to benefit from RdSAP 10, and you are close to a band boundary, particularly the D to C boundary, a new assessment is worth considering.

You Are Planning Improvements and Want an Accurate Baseline

If you are about to spend money on insulation, glazing, or heating upgrades, you want to start from an accurate picture of where the property currently stands. An old EPC, particularly one from before RdSAP 10, may not give you that.

 

A current assessment provides:

 

An accurate current score and band. What is the property actually rated at today, under the current methodology?

 

An accurate potential score. What could the property achieve if all recommended measures were implemented?

 

A current recommended improvements table. Which measures does the assessor recommend, in what order, and what is their estimated individual impact?

 

This information directly shapes which improvements to prioritise and in what order. Spending money on improvements guided by an old certificate is less efficient than spending money guided by a current one.

You Are a Landlord Planning for the 2030 MEES Deadline

Landlords need to achieve EPC band C by 1 October 2030. A new assessment in 2026 or 2027, before the Home Energy Model methodology change expected in late 2027, gives you:

 

An accurate picture of the current rating. Where does each property in your portfolio actually sit under RdSAP 10?

 

A clear gap to C. How many points does each property need to reach C, and which measures deliver those points most cost effectively?

 

The ability to plan and phase improvements. Rather than rushing improvements in 2029 and 2030 when installer availability will be constrained and prices elevated, you can commission work now at your own pace.

 

The strategic option of locking in a C before HEM. A valid EPC C issued before October 2029 under the current methodology is treated as compliant for up to 10 years. Getting assessments and improvements done now preserves this option.

 

When a New Assessment Is Not Worth It

Your Existing Certificate Is Recent and Nothing Has Changed

A certificate issued in the last two or three years under RdSAP 10 (post June 2025) accurately reflects the property. If you have not made any significant improvements since then, a new assessment produces essentially the same result at a cost of £60 to £120 for no benefit.

You Are Commissioning Improvements and the Assessor Will Come Back Afterward

If you are about to install significant improvements, solid wall insulation, a heat pump, solar panels, there is no point commissioning an assessment now when the certificate will be outdated within months. Commission the improvements, then get a new assessment once they are complete to capture the improved rating.

 

The exception is if you need an accurate current baseline to plan what improvements are needed. In that case, a pre improvement assessment is useful planning information even if you will commission another one after the works.

The Improvement to Your Rating Would Be Marginal

If you have made minor improvements since the last assessment, draught proofing, a new programmer, LED lighting, and these are unlikely to move the rating by more than a point or two, a new assessment is not going to produce a meaningfully different certificate. Save the money.

 

What to Expect From a New EPC Assessment

A domestic EPC assessment typically takes 30 to 60 minutes for a standard property. The assessor visits the property and records:

 

• Wall, roof, and floor construction
• Heating system type, make, model, and controls
• Hot water provision
• Window glazing type and condition
• Presence and depth of insulation in loft and walls

 

Under RdSAP 10, the assessor uses a hierarchy that prioritises documented evidence over default assumptions. Bring out any documentation you have, boiler installation certificate, insulation completion certificates, FENSA window certificates, before the assessor arrives.

 

The assessor enters the data into approved SAP software, calculates the rating, and lodges the certificate on the national EPC Register. You receive a copy. The certificate appears on the public register within a few days of lodgement.

 

How Much Does a New EPC Assessment Cost?

EPC costs in 2026 range from approximately £60 to £120 for a standard domestic property, depending on the property size and the assessor’s location and pricing. Larger properties take longer to survey and cost more.

 

Shop around, but do not choose purely on price. An assessor who spends 20 minutes in a large property has not assessed it properly. Check that the assessor is accredited on the EPC Register’s accredited assessor search before appointing them.

 

Frequently Asked Questions

Can I use an existing EPC if I am selling my property? Yes, if it is less than 10 years old and lodged on the national register. You do not need a new assessment unless the existing certificate has expired.

 

Will a new EPC definitely show a higher rating if I have made improvements? Not definitively, it depends what improvements you have made and how they affect the calculated energy performance. Significant improvements such as full loft insulation, cavity wall insulation, or a new boiler are very likely to improve the rating meaningfully. Minor improvements may make little difference.

 

Can I choose which assessor to use? Yes. You can commission an EPC assessment from any accredited domestic energy assessor. Find accredited assessors through the EPC Register or through accreditation bodies such as Elmhurst Energy, Stroma, or ECMK.

 

How long does it take to get an EPC? Most assessors can complete the survey and lodge the certificate within a few days of the visit. In busy periods, appointment availability may extend this. For sale or letting situations with a deadline, book early.

 

Does the EPC assessor check if my insulation is actually there? The assessor records what is visible and what can be evidenced through documentation. They do not open walls or carry out invasive inspections. Where insulation is not visible and no documentation exists, the assessor may record the wall or floor as uninsulated. Keep all installation certificates to ensure improvements are correctly recorded.

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Costs and methodology information correct as of April 2026. The Home Energy Model is expected in late 2027 and will introduce a new assessment framework, monitor government guidance for updates.

 

This article will walk you through how to improve EPC rating as doing so in 2026 means working within a methodology that is about to change significantly. The Home Energy Model (HEM), the government’s replacement for the current SAP and RdSAP framework, is expected in the second half of 2027. When it arrives, it will assess properties against four new headline metrics rather than a single energy cost band. What that means for your rating, and what you should prioritise now to get ahead of it, depends entirely on what your property currently has and lacks.

 

Why 2026 and 2027 Are the Critical Window

The government has confirmed that landlords must achieve an EPC band C by 1 October 2030. EPCs issued under the current methodology (RdSAP 10, introduced June 2025) will remain valid for 10 years. A property that achieves a valid EPC C before October 2029 under the current methodology will be treated as compliant until that certificate expires, potentially until 2039.

 

This creates a clear strategic case for achieving band C before HEM takes effect. A property owner who secures a C rating under the current, more straightforward methodology avoids the more demanding dual metric requirements that HEM introduces. The EPC Checker published analysis suggesting that some properties currently sitting at C could fall to D under HEM without any physical changes, because the new methodology assesses fabric performance and heating system performance separately, and a gas boiler property that passes the current overall cost test may fail the heating system metric under HEM.

 

Acting in 2026 and 2027 means working within the known current methodology, with a clear understanding of what it takes to reach C and a straight line between the current rating and the target.

 

Understanding the Four HEM Metrics

HEM will assess properties against:

 

Fabric performance, how well the building retains heat through insulation, draught proofing, and windows. This maps most directly to the improvements covered in this guide.

 

Heating system, the efficiency and carbon intensity of the heating system. Under HEM, gas boiler properties are expected to score worse on this metric than under the current methodology.

 

Smart readiness, whether the property can generate its own energy (solar PV) or manage energy demand intelligently.

 

Energy costs, the estimated running cost, similar in concept to the current EPC score.

 

Properties will need to demonstrate compliance on fabric performance first, then on either heating system or smart readiness. This means that for many properties, achieving HEM compliance will require both fabric improvements and either a heat pump or solar panels, a more expensive and complex programme than the current single band requirement.

 

The Improvements That Work Under Both Methodologies

Some improvements count strongly under both the current RdSAP 10 methodology and the anticipated HEM framework. These are the ones to prioritise now.

Loft Insulation

Topping up to 270mm delivers significant fabric performance improvement under both methodologies. It is the cheapest high impact measure available and should be the starting point for any unimproved property. Under HEM’s fabric performance metric, loft insulation contributes directly to the assessment.

Wall Insulation

Cavity wall insulation for eligible properties, and external or internal wall insulation for solid wall properties, improves both current EPC scores and HEM fabric performance. For solid wall properties aiming for band C before 2029, wall insulation is almost always the central measure.

Floor Insulation

Contributes to fabric performance under both methodologies. Not as high impact as loft and wall insulation in most properties, but as part of a comprehensive fabric package it contributes meaningful points and helps future proof the property against HEM fabric performance requirements.

Double and Triple Glazing

Window upgrades count under both methodologies. The marginal gain from upgrading already fitted double glazing to triple glazing is modest. Moving from single to double glazing produces a more meaningful improvement.

 

The Improvements Where Timing Matters

Gas Boiler Replacement

Under the current methodology, replacing an old G rated boiler with a modern A rated condensing boiler adds 3 to 8 EPC points. Under HEM, a gas boiler, however efficient, is expected to perform poorly on the heating system metric. Replacing a gas boiler with another gas boiler in 2026 may achieve current EPC C but not satisfy HEM’s heating system requirement.

 

The decision point: if the current EPC is close to C and a boiler upgrade would push it over the line, it may make strategic sense to get that EPC C certificate now before HEM takes effect, rather than waiting for a heat pump that might not be in the budget. A valid EPC C from before October 2029 locks in current methodology compliance for up to 10 years.

 

If HEM compliance by 2030 is the target, particularly for landlords with longer horizons, the case for moving directly to a heat pump rather than replacing a gas boiler is stronger.

Heat Pump Installation

A heat pump installation improves the current EPC score substantially and is expected to satisfy HEM’s heating system metric. The Boiler Upgrade Scheme provides a grant of £7,500 toward heat pump installation costs, available to landlords and owner occupiers.

 

Heat pumps perform best in well insulated properties. Installing a heat pump before improving the fabric means the heat pump runs at higher flow temperatures to compensate for higher heat loss, which undermines its efficiency. The fabric first approach, insulation before the heat pump, produces a better performing and more cost effective outcome.

Solar PV

Solar panels improve the current EPC score by 10 to 20 points and satisfy HEM’s smart readiness metric. For properties that are strong on fabric but have a gas heating system that performs poorly under HEM, solar PV may be the most practical route to HEM compliance without a full heating system replacement.

 

The cost of solar PV has fallen significantly in recent years. A 3 to 4kWp system typically costs £5,000 to £8,000 installed in 2026.

 

A Practical Improvement Roadmap

For a property currently rated D or E aiming for C before October 2029:

 

Step 1: Commission a current EPC under RdSAP 10. If your existing EPC is from before June 2025, it was produced under the previous methodology. A new assessment gives you an accurate baseline and a recommended improvements table that reflects current calculations.

 

Step 2: Address loft insulation. If the loft has less than 270mm, top it up. This is the quickest and cheapest high impact improvement available.

 

Step 3: Address wall insulation. If the property has an unfilled cavity, fill it. If it has solid walls, commission a survey for EWI or IWI. Check eligibility for ECO4 and GBIS funding before paying privately.

 

Step 4: Check the gap to C. After loft and wall insulation, get a new EPC or ask the installer to produce an in principle EPC improvement estimate. How many more points do you need?

 

Step 5: Address the remaining gap. Floor insulation, glazing, heating controls, solar PV, or heating system upgrade depending on what the property needs and what the budget allows.

 

Step 6: Confirm EPC C is achieved before October 2029. Commission a new EPC assessment once improvements are complete. A valid EPC C before this date locks in compliance under the current methodology for up to 10 years.

 

The Cost Cap for Landlords

Landlords subject to the 2030 MEES deadline have a spending cap of £10,000 per property toward achieving band C. Expenditure from 1 October 2025 counts toward this cap. Where the cost of reaching C exceeds £10,000 and no grant funding is available to cover the balance, a cost cap exemption can be registered.

 

This means landlords who invest £10,000 in improvements, even if the property cannot reach C within that budget, can register a compliant exemption rather than facing a penalty. The practical strategy is therefore to spend the £10,000 on the measures most likely to improve the rating as far as possible, even if C is not achievable.

 

Frequently Asked Questions

Will my current EPC C still be valid after HEM takes effect? Yes. EPCs are valid for 10 years from issue regardless of methodology changes. A valid EPC C issued before October 2029 under the current methodology will be treated as compliant for up to 10 years.

 

Could I currently be rated C but fail under HEM? Possibly. Properties with gas boiler heating may perform well on the current overall energy cost metric but poorly on HEM’s separate heating system metric. The government has said that a valid EPC C before October 2029 locks in current methodology compliance, but this is a strong argument for achieving C now rather than waiting.

 

Is there a definitive HEM specification available yet? Not in full. The government published its partial response to the EPC consultation in 2025 confirming the four metric structure and the 2027 timeline. Full technical specifications for assessors and software developers are expected as HEM development progresses.

 

What happens if my property genuinely cannot reach C under either methodology? Register an exemption. The exemption framework under MEES allows landlords to register compliance where the property genuinely cannot reach the required standard within the cost cap. Exemptions last 5 to 10 years and must be supported by evidence.

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Information correct as of April 2026. HEM implementation timeline and methodology details are subject to government confirmation, monitor DESNZ guidance for updates.