The UK government spent £1.2 billion on energy efficiency schemes in 2023, yet only 14% of homes with cavity walls have them filled. That gap between policy and pavement is where the real story sits.
Small Business UK this week ran a guide to green business grants, listing pots for heat pumps, solar panels, and insulation. The article, as reported by Small Business UK, covers Stream 2 of the Business Energy Efficiency Programme and the Low Carbon Skills Fund. But the mechanics, fabric first, heat pumps, solar PV, are identical to what a homeowner faces. The difference is scale: a business can claim up to £20,000 for a heat pump install; a household gets roughly £7,500 through the Boiler Upgrade Scheme.
What this means for your EPC and your bill
Every £100 spent on loft insulation saves a typical semi-detached home about £45 a year on heating, according to Energy Saving Trust figures. That is a 45% annual return, better than any savings account. Yet most grants target the same measures: cavity wall insulation (payback 2–3 years), loft insulation (1–2 years), and draught-proofing (under a year). The business grants simply package them with a higher ceiling.
The catch is eligibility. ECO4, the main domestic scheme, is restricted to households on means-tested benefits or with a total income under £31,000. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing.
Who qualifies, and who doesn’t
Homeowners with a gas boiler and an EPC of C or above will likely find no grant covers them. The logic is simple: the government wants the worst-performing homes first. That leaves roughly 5 million homes in England alone with EPC D or below, according to the English Housing Survey. For those households, the route is clear: check eligibility on the gov.uk energy grants page, then contact a TrustMark-registered installer.
But what about the 2 million homes with EPC C that still leak heat through single-glazed windows or uninsulated solid walls? Those households fall into a gap. The Boiler Upgrade Scheme covers heat pumps regardless of EPC, but the upfront cost after the £7,500 grant still runs £3,000–£5,000 for a typical install. No grant covers secondary glazing or solid-wall insulation unless the home is in the lowest bands.
What to do next
First, check your EPC, it is free on the gov.uk register. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. If you are on benefits, ECO4 covers full cost of insulation and in some cases a heat pump. If you are above both thresholds, consider a self-funded fabric-first approach: loft insulation costs £300–£400 and pays back in two winters. Cavity wall insulation runs £700–£1,000 and cuts heating demand by a third.
The business grant story shows the same logic applies at any scale: stop the heat escaping before you change the heat source. Homeowners who follow that sequence will see their EPC rise, their bills fall, and their property value lift, without waiting for the next government announcement.
Frequently Asked Questions
Yes, through the Great British Insulation Scheme (GBIS), which is open to any home with an EPC rating of D or below, regardless of income. The scheme covers loft and cavity wall insulation. Check eligibility via the Energy Saving Trust's postcode tool.
The Boiler Upgrade Scheme provides £7,500 towards an air source heat pump. Typical install costs range from £10,000 to £15,000, so the homeowner pays roughly £2,500 to £7,500 out of pocket. Running costs are typically lower than a gas boiler, especially if paired with good insulation.
