Every property marketed for sale or rent in England and Wales must have a valid Energy Performance Certificate. The certificate assigns a rating from A (best) to G (worst) based on the property's energy efficiency. Understanding these ratings helps you estimate running costs, plan improvements, and avoid nasty surprises.
What the EPC ratings mean
The rating is calculated using a Standard Assessment Procedure (SAP) score from 1 to 100. Higher scores mean better efficiency and lower bills. Here is what each band means for a typical three-bedroom semi-detached home:
| Band | SAP Score | Typical Annual Cost | What it means |
|---|---|---|---|
| A | 92–100 | £500–800 | Outstanding efficiency. New builds with heat pumps and solar panels. |
| B | 81–91 | £800–1,200 | Very efficient. Well-insulated modern homes with efficient heating. |
| C | 69–80 | £1,200–1,600 | Good efficiency. Proposed minimum for rental properties. |
| D | 55–68 | £1,600–2,000 | Average. Most UK homes currently sit in this band. |
| E | 39–54 | £2,000–2,500 | Below average. Current legal minimum for rental properties. |
| F | 21–38 | £2,500–3,200 | Poor. Significant upgrades needed; illegal to let without exemption. |
| G | 1–20 | £3,200+ | Very poor. Extremely expensive to heat; major works required. |
How EPC affects mortgage eligibility
Your EPC rating can influence the mortgage deals available to you. Some lenders now set a minimum EPC requirement of E for standard residential mortgages. If the property falls below that threshold, you may face a smaller pool of willing lenders or higher rates.
On the other hand, properties rated A to C may qualify for green mortgage products. These offer lower interest rates or cashback incentives because energy-efficient homes are considered lower risk — lower bills mean borrowers are less likely to default. Lenders including Barclays, NatWest, and Nationwide all offer green mortgage deals.
EPC requirements for landlords
The Minimum Energy Efficiency Standards (MEES) regulations make it illegal to grant a new tenancy on a property with an EPC rating below E in England and Wales. Landlords who let a property rated F or G face fines of up to £5,000.
The government has proposed raising the minimum to C for new tenancies, with all existing tenancies required to meet the C standard shortly after. If you are buying a rental property, factor in the cost of reaching at least a C rating when calculating your return on investment.
How to improve your EPC rating
If your property has a low rating, these are the most effective upgrades ranked roughly by cost-effectiveness:
- Loft insulation (270mm+) — often the cheapest improvement with the biggest impact, typically adding 1–2 rating bands
- Cavity wall insulation — if your property has unfilled cavities, this is one of the most cost-effective upgrades available
- Boiler upgrade — replacing an old G-rated boiler with a modern A-rated condensing boiler can save £300+ per year
- Double or triple glazing — replacing single-glazed windows reduces heat loss and noise
- LED lighting throughout — a low-cost change that contributes a small but measurable improvement
- Solar panels — can push a C rating up to B or even A, and generate income through the Smart Export Guarantee
- Smart heating controls — programmable thermostats and TRVs give a modest boost for relatively little outlay
How to check a property's EPC
You can look up any property's current and historical EPC certificates for free on the government's EPC Register. Alternatively, use our free EPC checker to search by postcode and instantly see all certificates in an area, including the current rating, potential rating, and certificate expiry date.
Check any property's EPC instantly
Use our free EPC checker to look up ratings by postcode, or get a full PropertyReportUK report that includes EPC data alongside flood risk, crime, price history, and more — all in one place.