Only one in five eligible households claimed an energy grant last year, according to a survey by Uswitch. That means 4 million UK homes missed out on money that could have cut their heating bills by a third.
The gap between eligibility and take-up is staggering. As reported by Uswitch, the Energy Company Obligation (ECO4) scheme alone has £4bn of funding available through 2026, yet hundreds of millions remain unspent. The catch is that most people do not know they qualify.
Who qualifies, and who doesn’t
ECO4 targets low-income households, but the definition is broader than many assume. Anyone receiving means-tested benefits, Universal Credit, Pension Credit, Child Tax Credits, can get free loft insulation, cavity wall fill, or a new boiler. A typical 3-bed semi with no loft insulation could see its annual heating bill drop from £1,800 to £1,200 after installation, according to Energy Saving Trust estimates.
Yet the eligibility rules are a maze. The scheme requires the home to have an EPC rating of D or below. That rules out the 40% of English homes already at C or better. And even for those who qualify, the installer must be certified by TrustMark or PAS 2030, a detail that trips up many DIY applicants.
The Boiler Upgrade Scheme is different: it offers £7,500 off an air-source heat pump, no income test required. But uptake has been sluggish. Only 20,000 households claimed it last year, partly because the grant still leaves a typical installation costing £2,000–£4,000 after the subsidy. The government’s own impact assessment admits awareness is below 30%.
What it costs a typical 3-bed semi
For a homeowner in Birmingham with a gas boiler and uninsulated loft, the maths is stark. Without a grant: loft insulation costs £500–£700 and saves about £200 a year. With ECO4: zero upfront cost, same saving. Over five years that is a net gain of £1,000.
But the paperwork deters people. Uswitch’s checker asks for your postcode, household income, and current heating system, about three minutes of data entry. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. Ofgem figures show that households who use such checkers are 60% more likely to proceed with an application.
Yet the real barrier is trust. A Citizens Advice survey found 40% of non-claimants feared the grants were a scam or came with hidden fees. Legitimate schemes never ask for bank details upfront. The Energy Saving Trust and Ofgem both maintain lists of approved installers.
What this misses, the EPC trap
Here is the uncomfortable truth: even if you claim every grant available, your EPC rating may not budge. A new boiler lifts the score by maybe 5 points. Full insulation and solar panels can push a D to a C, but the current funding does not cover solar for most households. The Boiler Upgrade Scheme ignores solar entirely.
That matters because the government plans to require a minimum EPC C for all rented homes by 2028, and owner-occupiers will feel the pressure through higher mortgage rates on low-rated properties. A D-rated home adds roughly 0.5% to the interest rate on some green mortgages, according to Nationwide data.
The result is a system that helps the poorest but leaves the squeezed middle, households earning too much for ECO4 but too little to pay £10,000 for a heat pump, with no route to upgrade. The Uswitch checker flags this gap but cannot fix it.
What to do and by when
Households on benefits or with an EPC below C should check eligibility at the Uswitch grants tool or the Energy Saving Trust’s postcode checker. Applications for ECO4 must be submitted by 31 March 2026, but installer lead times already stretch to six months in some regions. The Boiler Upgrade Scheme has no deadline but the £7,500 rate is only guaranteed until April 2025, after which it falls to £5,000.
For those who do not qualify: a simple loft insulation top-up costs about £300 and pays back in two winters. No grant needed. The cheapest fix is often the one you do yourself.
Frequently Asked Questions
Yes, through the Boiler Upgrade Scheme for heat pumps (£7,500) or the Great British Insulation Scheme for loft and cavity wall insulation, which is income-assessed but not benefit-linked. Check your EPC rating first, homes rated D or below are prioritised.
Typically yes, but the gain depends on your starting point. Loft insulation alone can lift a D to a C. A heat pump may not change the rating much if the home is poorly insulated. Grants cover the fabric upgrades first, which usually deliver the biggest EPC jump.
