The government’s proposed EPC framework would require all homes to reach a C rating by 2030. The Intermediary reports that more than half of UK homes currently fall short of this threshold. That is not a hypothetical risk, it is a present-day liability for anyone planning to sell or rent out a property within the next six years.
As reported by The Intermediary, the new framework will measure energy performance using a revised metric that accounts for both fabric efficiency and low-carbon heating. The catch is that many homes built before 1990, about 60% of the housing stock, have solid walls, single glazing, or gas boilers that drag their score down.
Who qualifies, and who doesn’t
The proposed C rating applies to all homes sold or rented from 2030. Owner-occupiers are not directly forced to upgrade, but the effect on property value is real. A home stuck at an E or F rating could lose 10–15% of its sale price compared to a C-rated equivalent, according to analysis by Nationwide. Landlords face a harder deadline: they must comply before new tenancies are signed, or face fines of up to £30,000.
Homes with solid walls, no loft insulation, or electric storage heaters are the most exposed. Ofgem data shows that a typical 3-bed semi with solid walls and a gas boiler scores around D55, well short of the C69 threshold. Upgrading to a heat pump, topping up loft insulation to 270mm, and installing double glazing can lift that by 15–20 points.
What it costs a typical 3-bed semi
The Energy Saving Trust estimates that bringing a D-rated 3-bed semi up to a C costs between £5,000 and £15,000, depending on the work needed. Loft insulation costs £500–£1,500, cavity wall insulation £500–£2,000, and a heat pump (with installation) £7,000–£13,000 after the Boiler Upgrade Scheme grant of £7,500. Solar panels add another £4,000–£6,000 but also generate income via the Smart Export Guarantee, paying about £100–£200 per year.
But, and this is the critical point, grants are not unlimited. The Boiler Upgrade Scheme has allocated £450m through 2028, but applications for heat pumps hit 4,000 per month in early 2025, up 60% year-on-year. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. Households in bands F–H in England may receive nothing.
How to start now
The first step is an EPC assessment, costing £60–£120. The report will list recommended improvements and their estimated cost. From there, prioritise insulation, it is the cheapest way to gain points. A loft top-up alone can add 5–10 points. Then move to heating: a heat pump or biomass boiler adds 10–15 points. Solar panels add 5–10 points but have a longer payback.
Homeowners on standard variable tariffs can apply for the Boiler Upgrade Scheme through the government portal from 4 November 2025. Eligibility closes on 31 March 2028. For insulation, the Great British Insulation Scheme runs until June 2027. The message is clear: start planning this year, or risk being caught in a rush of demand that pushes installer wait times to 12 months or more.
Frequently Asked Questions
Not directly, but lenders are increasingly using EPC data to assess property risk. Some banks, like Nationwide and Barclays, offer lower rates for homes with an A or B rating. From 2030, if you want to sell or rent, you must have at least a C rating.
Yes for insulation, DIY loft rolls cost about £200 and can be installed in a weekend. But heat pumps and solar panels require certified installers to qualify for grants. Check MCS certification on the Microgeneration Certification Scheme database before hiring.
