If your home is hard to heat and you’re on a low income or certain benefits, ECO4 can fund insulation, a heating upgrade, or even a full replacement heating system — but the scheme has a hard stop, and the criteria trip a lot of people up. Here’s how eligibility actually works.
What ECO4 is
ECO4 (Energy Company Obligation, fourth phase) is a government-mandated scheme that requires large energy suppliers to fund energy efficiency improvements in low-income and vulnerable households. It’s not a cash grant you apply for at a government office — it’s delivered through energy suppliers and approved installers, funded by an obligation placed on the suppliers themselves.
The scheme closes on 31 December 2026. That’s later than originally planned — the end date was extended from 31 March 2026 by nine months, specifically to give suppliers more time to complete installations already in the pipeline. If you’re planning to apply, don’t treat “later this year” as safe — installer capacity gets tighter as deadlines approach, and being in the system before the deadline is not the same as having work completed by it.
The three ways to qualify
1. Benefits-based eligibility (the Help to Heat Group route) You’re likely to qualify if you or someone in your household receives at least one of these:
- Income-based Jobseeker’s Allowance (JSA)
- Income-related Employment and Support Allowance (ESA)
- Income Support
- Pension Credit Guarantee Credit
- Universal Credit
- Housing Benefit
- Pension Credit Savings Credit
- Child Benefit (subject to income caps that vary by household size)
Households receiving a Warm Home Discount Core Group rebate also qualify under this route.
2. Social housing with a poor energy rating If you’re in social housing with an Energy Performance Certificate (EPC) rated D, E, F, or G, and the property is let below market rate, it may qualify — though the specific measures available depend on which band the property currently sits in.
3. ECO4 Flex (the local authority route) This is the route for people who don’t receive a qualifying benefit but are still struggling — for example, on a low income with high energy costs, or clinically vulnerable to cold-related illness. Local authorities set their own criteria within the government’s framework and can refer eligible households directly. If routes 1 and 2 don’t apply to you, this is worth checking with your council before assuming you’re out of luck.
The property still has to qualify
Eligibility isn’t just about your income or benefits — the property matters too. ECO4 only covers homes currently rated EPC band D to G, and the scheme has minimum improvement targets: a band D or E home has to be brought up to at least band C, and a band F or G home has to reach at least band D. If your home is already band C or above, it won’t qualify for ECO4 (though it might still be eligible for other schemes, like the Boiler Upgrade Scheme).
What it actually pays for
Depending on your property and the route you qualify through, ECO4-funded measures can include:
- Loft, cavity wall, or solid wall insulation
- First-time central heating installation
- Renewable heating systems, including heat pumps
- Connection to a district heating network
- Boiler repairs or replacements
- Window and glazing upgrades
Not every measure is available to every household — what you’re offered depends on your current EPC band and which improvements are needed to hit the required target band.
How to actually apply
There’s no single national application form. In practice:
- Contact your energy supplier directly — larger suppliers run their own ECO4 schemes and can tell you if you qualify.
- Check via Simple Energy Advice, the government-backed advice service, if you’re unsure where to start.
- Contact your local authority if you think ECO4 Flex might apply to you rather than the benefits route.
Be wary of anyone cold-calling you about “free government grants” and asking for payment upfront or your bank details before doing anything — ECO4 measures are delivered through energy suppliers and accredited installers, not third parties charging a fee to “process your application.”
The bottom line
If you receive a qualifying benefit and your home is EPC band D or below, it’s worth checking your eligibility now rather than in six months — the scheme has a fixed end date, and installer availability tends to shrink as any deadline approaches. If you don’t receive a qualifying benefit, don’t assume you’re excluded — the ECO4 Flex route exists precisely for people who fall outside the standard benefits list but are still struggling to heat their home.
Rules and criteria can change — always confirm your specific eligibility with your energy supplier, your local authority, or GOV.UK before making decisions based on this article.
Sources: Ofgem — ECO4 FAQs for domestic consumers and landlords; GOV.UK — Extending the ECO4 end date: government response