The EPC rating on a property you're considering buying is not just a box to tick — it affects how much you'll spend on energy bills, what mortgage rate you might qualify for, and how easy the property will be to sell in the future. Most buyers glance at the rating and move on. This guide explains what to actually do with that information.
Contents
How to find the EPC for a property
Every property listed for sale in England and Wales is legally required to have a valid EPC, and sellers must make it available to prospective buyers. In practice, it is usually included in the property listing on Rightmove or Zoopla. You can also search the national EPC register at gov.uk/find-energy-certificate using the property address — this is free and shows the full certificate, not just the headline rating.
Check the date on the certificate. EPCs are valid for ten years, so a certificate from 2015 or earlier may be outdated if significant improvements (or deterioration) have occurred since. A seller who has recently insulated the property or upgraded the boiler may not have obtained an updated EPC — worth flagging to your solicitor.
What the rating means for your energy bills
The EPC includes estimated annual energy costs for the property based on standardised assumptions (typical occupancy and heating patterns). These are not a precise forecast of your bills — your actual usage, energy tariff, and behaviour will all differ — but they give a meaningful comparison between properties.
Approximate annual energy cost ranges by rating for a typical UK semi-detached house, based on 2026 energy prices:
| EPC Rating | Estimated annual energy cost |
|---|---|
| A / B | £800 – £1,200 |
| C | £1,200 – £1,800 |
| D | £1,800 – £2,400 |
| E | £2,400 – £3,200 |
| F / G | £3,200+ |
The difference between a C-rated and an E-rated home can easily be £800–£1,400 per year in energy costs — around £70–£120 per month. Over a 25-year mortgage, that is a meaningful cumulative cost that is worth factoring into your affordability calculations alongside the monthly mortgage payment. Our mortgage calculator shows the monthly repayment; add the estimated energy cost from the EPC to get a fuller picture of monthly housing costs.
How it affects your mortgage
EPC ratings are having an increasing influence on mortgage products in 2026:
- Green mortgages — a growing number of UK lenders offer slightly lower rates for properties rated A or B. Halifax, Barclays, NatWest, and Nationwide all offer green mortgage variants. The discount is typically 0.10–0.20% off the standard rate, which on a £200,000 mortgage over 5 years equates to £1,000–£2,000 in savings. Not transformative, but worth knowing.
- Lender risk assessment — some lenders have begun treating very low EPC ratings (F or G) as a risk factor, either declining to lend on those properties or requiring a higher deposit. If you are considering a property with an F or G rating, speak to a broker early about which lenders will consider it and on what terms.
- Valuation impact — surveyors are increasingly noting EPC ratings in valuations, and research from Rightmove and others consistently shows that higher EPC-rated properties achieve higher sale prices, particularly at the C/D boundary. A D-rated property might sell for 1–5% less than a comparable C-rated one, and improving before sale can deliver a return on investment.
Future saleability and rental rules
If you are buying with any possibility of letting the property in the future, EPC rules for landlords matter. Currently, all rented properties in England and Wales must have a minimum EPC rating of E. The government has proposed raising this to C by 2030 — if that legislation passes, any property rated D or below would need improvement work before it could be let. Properties at E are currently compliant for letting but may not remain so.
Even if you are buying purely to live in, saleability in 5–10 years is a reasonable consideration. Buyers in the future will be more EPC-conscious than today, and properties that require significant energy improvement work to reach acceptable standards may be harder to sell or may require a price discount to do so.
Buying a property with a low EPC rating
A low EPC rating is not necessarily a reason not to buy — plenty of attractive, well-located properties have D or E ratings, and the rating can be improved. What matters is going in with open eyes:
- Factor in improvement costs upfront. Get a sense of what work the EPC recommends and what it would realistically cost before you make an offer. Your solicitor or surveyor may be able to help, or you can obtain quotes from installers during the purchase process.
- Check whether government grants apply. The Great British Insulation Scheme, ECO4, and other government programmes may fund insulation and heating improvements in lower-rated properties, subject to income and property eligibility criteria. This can significantly reduce the cost of improvement.
- Negotiate. A low EPC rating is a legitimate factor in price negotiation — the cost of bringing a property from E to C can be thousands of pounds, and there is nothing wrong with factoring that into the offer you make.
- Check what the property is eligible for. Some older properties — particularly listed buildings and some period properties — cannot have certain improvements carried out without planning consent, which may limit how much the rating can be improved regardless of budget.
The cost of improving a rating
Improvement costs vary widely depending on the property and what is already in place. Typical UK costs in 2026:
- Loft insulation (installed): £300–£700 (sometimes free under government schemes)
- Cavity wall insulation: £500–£1,500
- New condensing boiler: £2,000–£4,000 supply and install
- Double glazing (full house): £5,000–£15,000 depending on property size
- Solar PV panels (4kW system): £6,000–£9,000
- Air source heat pump: £8,000–£15,000 (government grant of £7,500 available via Boiler Upgrade Scheme)
Getting from D to C typically costs £1,000–£5,000 for most properties with a combination of insulation and minor heating improvements. Getting from E to C costs more — often £3,000–£10,000 — and may require a combination of measures. Always get a new EPC after improvement work to confirm the new rating.
Buyer checklist
- Check the EPC for the property before viewing — available on the government register or in the listing
- Note the date — if it is more than 5 years old and significant work has been done, ask whether a new one has been obtained
- Read the recommended improvements section — this tells you what would be needed to improve the rating and gives an estimate of the impact
- Factor the estimated annual energy cost into your monthly housing cost calculation
- If the rating is D or below, get an indication of improvement costs before finalising your offer
- Ask your mortgage broker whether the rating affects the products available to you, and whether a green mortgage would be available if you improve it
- If you might ever let the property, confirm what rating would be required under current and proposed legislation
Need an EPC for a property you are selling or have just bought? The UK's largest EPC provider can arrange an assessment quickly across England and Wales.
Affiliate link — we may earn a commission if you book via this link, at no cost to you.
The EPC rating scale (A–G)
Frequently asked questions
What EPC rating should I look for when buying?
A rating of C or above signals an efficient, cheaper-to-run home. D is the most common rating for existing UK homes and is usually fine. E, F or G means higher energy bills and likely improvement costs — not a reason to walk away, but a reason to budget and to use it in your offer.
Does the EPC rating affect my mortgage?
It can. A growing number of lenders offer “green mortgage” incentives — a small rate discount or cashback — for homes rated A or B, and a very low rating can occasionally narrow your lender options. For most purchases the EPC affects your running costs more than your mortgage, but it's worth checking.
Can I buy a house with a low EPC rating?
Yes. A low rating isn't a barrier to buying, but budget for improvements and factor the higher running costs into affordability. If you plan to let the property, note that rented homes currently must meet a minimum EPC of E, and the government has consulted on raising that in future — so check the latest rules.
How much does it cost to improve an EPC rating?
It varies widely. Insulation and LED lighting are inexpensive and high-impact; a new boiler, double glazing or a heat pump costs far more. The EPC lists recommended measures with estimated costs and annual savings, which is the best starting point for a property you're buying.
Last reviewed: July 2026 · Next review due: October 2026