In early 2026, the UK government announced that Energy Performance Certificates are set for their most significant overhaul since they were introduced in 2007. The current system - a single A-to-G band based on the SAP (Standard Assessment Procedure) score - will be replaced by a new framework built around four separate performance metrics.
This is not a minor tweak. The reform changes what an EPC measures, how it presents results, and what "good" looks like for different types of property. It also has real implications for homeowners planning improvements, landlords preparing for the 2030 EPC C deadline, and anyone buying or selling a home.
This guide explains what is changing, why the government is making this shift, what the expected timeline looks like, and what you should be doing now.
What is changing: from one band to four metrics
The current EPC system gives every property a single rating from A (most efficient) to G (least efficient). That rating is based on a SAP score, which combines fabric performance, heating efficiency, fuel costs, and other factors into one number.
The problem is that a single number hides important differences. Two homes with the same EPC band can have very different characteristics - one might have excellent insulation but an old boiler, while another has a new heat pump but poor fabric. The A-to-G band tells you neither of these things.
Under the proposed reform, the single band will be replaced by four distinct metrics:
1. Fabric performance
This measures how well the building itself retains heat - the quality of walls, roof, floor, windows, and airtightness. A home with good fabric performance loses less heat and needs less energy to stay warm, regardless of how it is heated.
Fabric performance is arguably the most durable measure of a building's energy efficiency. Insulation and glazing last decades; heating systems get replaced every 10-20 years. By separating fabric from heating, the new system gives a clearer picture of the building's long-term thermal quality.
2. Heating system efficiency
This metric assesses how clean and efficient the heating system is. It takes into account the type of fuel (gas, electricity, oil, etc.), the efficiency of the boiler or heat pump, and the quality of the distribution system (radiators, underfloor heating, pipework).
Crucially, this separation addresses one of the biggest criticisms of the current system: the way it treats electric heating.
Under the current SAP methodology, electric heating is often penalised because electricity has historically been assigned a high carbon factor and a high fuel cost per kWh. This means that a modern, efficient heat pump can sometimes score worse than an old gas boiler on the overall EPC - which does not reflect reality for a grid that is rapidly decarbonising.
The new heating metric is expected to use updated carbon and cost factors that better reflect the actual emissions intensity of the electricity grid. This should result in fairer treatment for heat pumps, modern electric heating, and other low-carbon systems.
3. Smart readiness
This is an entirely new metric. It measures the extent to which a home is equipped with smart controls and demand-response technology - things like:
- smart thermostats and zoned heating controls
- smart hot water scheduling
- battery storage with grid interaction
- EV charger integration with home energy management
- demand-side response capability (the ability to shift energy use in response to grid signals)
The rationale is straightforward: as the electricity grid becomes more renewable, the ability to use energy flexibly (shifting demand to times when renewable generation is high) becomes increasingly valuable. A home that can do this is genuinely more efficient in system terms, even if its fabric and heating are identical to a neighbour that cannot.
Smart readiness is new territory for EPCs, and the details of how it will be scored are still being developed. But its inclusion signals a clear direction: the government sees smart energy management as a core part of future home performance, not an optional extra.
4. Estimated energy cost
The fourth metric is a running-cost indicator - an estimate of how much it costs to heat, light, and run hot water in the property per year.
This is not entirely new. The current EPC already includes estimated energy costs. However, the reform is expected to make this figure more prominent and more accurate, using updated tariff assumptions and (potentially) time-of-use pricing models that reflect how energy is actually billed.
For buyers and tenants, this may be the most immediately useful metric. It translates the technical details of fabric, heating, and smart readiness into a number that directly affects household budgets.
Why the government is making this change
The current EPC system has been criticised for years - by industry professionals, by academics, and by homeowners who find the results confusing or misleading. The main issues are:
- The single band hides too much. A property rated D could be a well-insulated home with an ageing boiler or a poorly insulated home with a brand-new heating system. The A-G band does not distinguish between these situations.
- Electric heating is penalised unfairly. The current SAP methodology uses carbon and cost factors for electricity that do not reflect grid decarbonisation. Heat pumps can score worse than old gas boilers on the current EPC - creating a perverse incentive against switching to low-carbon heating.
- Smart technology is not rewarded. The current system has no way to recognise smart controls, battery storage, or demand-response capability.
- EPCs need to support the net zero transition. The UK's legally binding 2050 net zero target requires deep decarbonisation of the housing stock. The government's view is that the current framework is not fit for purpose as a policy tool to drive this - it needs to measure what actually matters for decarbonisation.
Timeline: when is this happening?
The government has announced the reform in 2026, but an exact implementation date has not yet been confirmed. Based on current indications:
- 2026: Policy announcement and consultation on detailed methodology. The government is expected to publish technical specifications for the four metrics and consult with industry on implementation.
- Late 2026 or 2027: Expected rollout of the new EPC format. This is when new EPCs would start being issued under the four-metric system.
- Transition period: Existing EPCs issued under the current system are expected to remain valid until their normal expiry (10 years from issue). There will likely be a period where both old-format and new-format EPCs are in circulation.
It is important to be realistic about timing. EPC reforms have been discussed, delayed, and revised multiple times over the past decade. The direction of travel is clear, but the exact dates may shift. If you are making decisions about your property, do not wait for a specific launch date - focus on improvements that make sense under both the current and future systems.
What this means for homeowners
If you own your home, the reform does not require you to do anything immediately. Your existing EPC remains valid until it expires, and there is no requirement to get a new EPC just because the system has changed.
However, the reform does affect how you should think about home improvements:
Fabric upgrades become even more important
Under the new system, fabric performance gets its own metric. This means that insulation, glazing, and airtightness improvements will be clearly visible and valued - not hidden inside a composite score. If you are planning upgrades, prioritising fabric is a sound strategy because:
- fabric improvements benefit you under both the current and future EPC systems
- good fabric reduces your heating demand regardless of what heating system you use
- fabric upgrades (insulation, draught proofing, glazing) are durable and long-lasting
Heat pumps and electric heating will be treated more fairly
If you have been considering a heat pump but were concerned about its impact on your EPC, the reform should ease that concern. The updated heating metric is expected to recognise the lower real-world emissions of electric heating, rather than penalising it based on outdated carbon factors.
That said, if you are already planning a heat pump installation, there is no reason to wait for the new EPC format. The benefits (lower bills, lower emissions, access to grants like the Boiler Upgrade Scheme) are available now.
Smart home investments may start to count
If you have installed smart thermostats, battery storage, or other smart energy technology, the new system should recognise these for the first time. For homeowners who have already invested in smart tech, this is welcome news - your EPC will finally reflect what your home can do.
For a general overview of what an EPC covers: What is an EPC?
To check your current EPC and see recommended improvements: Check your EPC by postcode
What this means for landlords
For landlords, the reform adds a layer of complexity on top of an already significant regulatory change: the requirement to achieve EPC band C by October 2030.
The 2030 deadline still applies
The government has been clear that the 2030 EPC C requirement for private rented properties is proceeding regardless of the EPC reform. The two policies are related but separate - the reform changes how EPCs measure performance, while the 2030 deadline sets a minimum standard.
How the band C requirement translates into the new four-metric system has not been fully detailed yet. The government is expected to publish guidance on equivalence - that is, what level of performance on the new metrics constitutes "band C equivalent" for compliance purposes.
What should landlords do now?
The practical advice for landlords has not changed:
- Check your current EPC for every property in your portfolio. Look up your EPC here.
- Focus on fabric improvements first. These are valued under both the current and future systems, and they directly reduce your tenants' energy costs.
- Follow the recommendations on your existing EPC. The measures listed on your current certificate are still the best starting point for improving your rating.
- Keep records of all spending from October 2025. This counts toward the £10,000 cost cap under the new minimum standards.
- Do not wait for the new EPC format to start improvements. The 2030 deadline is fixed. Delaying improvements in the hope that the new system will be more favourable is a risk, not a strategy.
For full details on the 2030 requirements: EPC requirements for landlords 2025-2030
What this means for property sales
If you are buying or selling a property, the reform does not change the basic legal requirement: you need a valid EPC to market a property for sale in England and Wales.
Should sellers wait for the new system?
In most cases, no. A valid EPC issued under the current system remains legally acceptable. If your property has a poor rating, waiting for the new system will not improve your home's performance - it may just present the same shortcomings in a different format.
The one exception: if your property has features undervalued by the current system (for example, a well-insulated home with a heat pump that scores lower than expected under the current SAP methodology), a new-format EPC might give a more favourable picture. But this is speculative, and the exact scoring methodology has not been finalised.
Should buyers factor in the new metrics?
Once available, four separate scores will give buyers a clearer picture of what a property does well and where it falls short. A home with excellent fabric but an old heating system tells you the structure is sound and the next logical upgrade is the heating.
Until the new system is live, focus on the existing EPC data and the property's physical characteristics. The current EPC recommendations table remains the best tool available.
You can browse EPC data by area to compare properties: Browse EPC data by area
What to do now: practical advice
Whatever your situation, the core advice is the same:
- Prioritise fabric improvements (insulation, draught proofing, glazing). These are valued under both the current and new systems, and they make your home warmer and cheaper to run regardless of the certificate format.
- Do not delay worthwhile improvements just because the EPC format is changing.
- If you are a landlord, continue working toward the 2030 EPC C deadline. The 2030 requirement is not contingent on the reform timeline. Keep detailed records of all energy efficiency spending from October 2025 onward.
- If you are buying or selling, a current valid EPC is sufficient for any transaction. Use the EPC recommendations table to understand what improvements would make the biggest difference.
- Check your current EPC to understand where your property stands today.
FAQs
When does the new EPC system launch?
The government announced the reform in 2026. The new four-metric system is expected to roll out in late 2026 or 2027, but an exact date has not been confirmed. Existing EPCs remain valid until they expire (10 years from issue).
What are the four new EPC metrics?
The four metrics are:
- Fabric performance - how well the building retains heat
- Heating system efficiency - how clean and efficient the heating is
- Smart readiness - smart controls and demand-response capability
- Estimated energy cost - annual running cost indicator
Will my current EPC still be valid after the reform?
Yes. Existing EPCs are expected to remain valid until their normal expiry date (10 years from issue). You will not need a new EPC solely because the system has changed.
How will the new EPC system affect property sales?
Properties will still need a valid EPC to be marketed for sale. A current valid EPC issued under the old system remains legally acceptable. Once the new system is live, any new EPC will use the four-metric format.
What should I do now to prepare for the EPC reform?
For most people, no immediate action is required. If you are planning improvements, focus on fabric and insulation upgrades - these are valued under both the current and new systems. Landlords should continue working toward the 2030 EPC C deadline using current guidance. The direction of travel is clear: better fabric, cleaner heating, and smarter controls.
What to do next
- Check your current EPC and review the recommended improvements
- Prioritise fabric upgrades - insulation, draught proofing, and glazing improvements will be valued under both systems
- If you are a landlord, start planning for the 2030 EPC C deadline now
- Stay informed as the government publishes detailed methodology and implementation dates
Start here: Check your EPC rating by postcode
For more guidance: