Seventy-seven per cent of UK homeowners now say an EPC rating will be important when they move home, according to a survey reported by the Great Yarmouth Mercury. That is up from 55% just three years ago — a jump that reflects how energy performance has shifted from a technical footnote to a deal-breaker in the housing market. For anyone selling a property with a low rating, the message is blunt: upgrade or discount.
Why EPC ratings matter to your wallet
An Energy Performance Certificate rates a home from A (most efficient) to G (least). The survey, covered by the Mercury, confirms what estate agents have been whispering for months: buyers are asking for the certificate before they book a viewing. A home with a D rating or below typically costs £1,500–£2,500 more a year to heat than an A-rated equivalent, according to Energy Saving Trust data. That recurring cost is now visible on every monthly bill, and buyers are doing the maths.
But the impact goes beyond running costs. Mortgage lenders are increasingly adjusting rates based on EPC bands. Nationwide and Barclays both offer lower rates on homes rated C or above, while some lenders have capped maximum loan-to-value ratios on F and G properties. The catch is that a low rating can also reduce your buyer pool — first-time buyers on tight budgets simply cannot afford the higher monthly outlay.
What it costs to improve your rating
Boosting an EPC rating by one or two bands is rarely as expensive as sellers fear. Loft insulation (the cheapest single measure) costs £300–£500 and can lift a rating from E to D in a typical 3-bed semi. Cavity wall insulation runs £1,000–£1,500 and often adds a full band. For homes with solid walls, external insulation is pricier — £8,000–£12,000 — but can push a D up to a B.
The Great British Insulation Scheme covers most of the cost for low-income households, and the Boiler Upgrade Scheme offers £7,500 towards a heat pump, which typically lifts a D rating to a C. Ofgem figures show that over 120,000 households have used these grants since 2023. Officials have not confirmed when the next funding round opens, but eligibility currently runs until March 2027.
Who qualifies — and who doesn’t
The survey found that homeowners in the South East were most likely to prioritise EPC ratings (84%), while those in Wales and the North East were less concerned (68% and 65% respectively). This likely reflects regional differences in average energy costs and property values. A low rating in a high-value area like Surrey can knock £20,000 off a sale price; in a cheaper region, the discount is smaller but still significant.
Yet the survey also revealed a knowledge gap. Only 38% of respondents knew their own home’s EPC rating, and fewer than half understood the cost of upgrading. This is where the real opportunity lies. A homeowner who invests £2,000 in insulation and a smart thermostat can recoup that cost entirely in the sale price, while also saving £400 a year on energy bills. The return on investment is often better than a new kitchen.
What to do next: Check your EPC rating on the gov.uk database. If it is below C, get quotes for insulation and a heat pump. Apply for grants through the Energy Saving Trust website. Buyers will ask — be ready with the answer.
Frequently Asked Questions
Industry estimates suggest a rating of F or G can reduce the sale price by 5–10% compared to an equivalent C-rated home. On a £300,000 property, that is £15,000–£30,000 less. The exact figure depends on local market conditions and buyer demand.
Loft insulation is the most cost-effective single measure, typically costing £300–£500 and improving a rating from E to D in a 3-bed semi. Replacing old light bulbs with LEDs and installing a smart thermostat add further points for under £100.
