Millions of UK households can access free or subsidised energy efficiency improvements in 2026. From ECO4 insulation and heating upgrades for low-income homes to the GBP 7,500 Boiler Upgrade Scheme grant for heat pumps, this guide explains every major scheme, who qualifies, how much you can get, and how to apply.
UK energy bills have remained elevated following the price shocks of 2022 and 2023. Although the Ofgem price cap has moved below its peak, a typical household still spends well over GBP 1,500 per year on gas and electricity. For the roughly 3 million households officially classed as fuel poor in England -- those living in poorly insulated homes with low disposable incomes -- the burden is acute.
The government has responded with a suite of grant schemes designed to cut energy demand at source through better insulation and more efficient heating, rather than simply subsidising bills indefinitely. These schemes are funded partly through obligations placed on large energy suppliers and partly through direct Treasury spending. For eligible households, the financial benefit can be enormous: a full ECO4 retrofit -- covering loft insulation, cavity wall insulation, and a new heating system -- can cut annual energy costs by GBP 400 to GBP 700 or more, with no repayment required.
Understanding which scheme applies to you, and in what order to pursue them, is the starting point for accessing this support. The four main routes in 2026 are ECO4, the Great British Insulation Scheme, the Boiler Upgrade Scheme, and the Warm Home Discount -- each targeting a different part of the problem.
The Energy Company Obligation scheme, now in its fourth iteration (ECO4), is the UK's primary mechanism for funding energy efficiency improvements in low-income homes. Under ECO4, the largest energy suppliers -- those with 150,000 or more domestic customers -- must meet legally binding targets by funding insulation and low-carbon heating installations in qualifying properties.
ECO4 runs until March 2026, and the government has signalled a successor scheme (ECO5 or an equivalent) will follow. For 2026, ECO4 funding remains available and active. The scheme has a whole-house approach: rather than funding a single measure, it aims to bring homes up to at least EPC band C where possible, combining multiple upgrades such as loft insulation, solid wall insulation, cavity wall insulation, and heating system replacement.
To qualify for ECO4 you must meet at least one of the following conditions:
Your property must also have an EPC rating of D, E, F or G. Band C homes can qualify only in limited circumstances where heating system replacement alone is the measure. Note that Pension Credit -- with a minimum weekly guarantee of GBP 238.00 for a single person and GBP 363.25 for a couple in 2026/27 -- is both a gateway to ECO4 and itself significantly under-claimed. If you or an older relative might be entitled to Pension Credit, checking eligibility should be the first step.
Eligible measures under ECO4 include loft insulation, cavity wall insulation, solid wall insulation (internal or external), underfloor insulation, room-in-roof insulation, high-retention storage heaters, first-time central heating (where there is no existing central heating system), and low-carbon heating systems such as air source heat pumps and biomass boilers. Solar PV can be included as part of a broader package in specific circumstances.
All works are fully funded -- there is no grant cap or co-payment requirement for owner-occupiers who meet the criteria. For private tenants, the landlord must agree to the works but cannot be charged for them if the tenant qualifies. Social landlords have separate ECO4 obligations linked to decarbonisation targets.
The Boiler Upgrade Scheme (BUS) is aimed at households who want to switch from a gas or oil boiler to a low-carbon heating system but do not qualify for ECO4 -- typically middle-income homeowners who are not on means-tested benefits. It is demand-led: you choose to apply, select a certified installer, and the grant is deducted from your invoice.
Grant amounts in 2026 are:
The GBP 7,500 grant for air source heat pumps was doubled from GBP 5,000 in 2023 and has remained at this higher level through 2025 and 2026. This makes heat pump installations significantly more accessible -- a typical air source heat pump installation costs between GBP 10,000 and GBP 15,000 depending on property size and radiator upgrades needed, so the grant covers roughly half to three-quarters of the cost in many cases.
To use the BUS your property must meet these conditions:
The insulation requirement is a common sticking point. If your EPC recommends loft or cavity wall insulation and you have not had it done, you must either complete those measures first or obtain a new EPC showing they are not applicable. This is designed to ensure heat pumps are installed in well-insulated homes where they will operate efficiently.
Unlike ECO4, the BUS does not have an income threshold. A household earning GBP 200,000 per year can claim it equally with a household earning GBP 30,000. The government's rationale is that accelerating heat pump adoption requires mainstream market demand, not just support for the lowest-income households.
The Great British Insulation Scheme (GBIS) was launched in 2023 alongside ECO4 and extends energy efficiency support to households that may not be on means-tested benefits but still live in poorly insulated homes. Where ECO4 requires benefit receipt, GBIS uses property-level data -- council tax band and EPC rating -- as its primary eligibility filter.
In England, the general group eligible for GBIS are those in council tax bands A to D with an EPC rating of D, E, F, or G. There is also a low-income group within GBIS for those receiving qualifying benefits (similar to ECO4), which has fewer property restrictions.
The key difference from ECO4 is that GBIS funds a single insulation measure per property, not a whole-house package. The most commonly funded measures are:
For many households -- particularly those in band C or D council tax with an older, draughty semi-detached home -- GBIS is the most accessible route to free or heavily subsidised insulation without the need to prove benefit eligibility. Check your council tax band and your current EPC rating on the government's Find an Energy Certificate service to understand whether GBIS is likely to apply to your property.
Alongside the physical improvement schemes, several programmes address the immediate problem of unaffordable energy bills through direct financial support.
The Warm Home Discount provides a GBP 150 rebate applied directly to your electricity bill each winter. It is not paid as cash. The scheme in England and Wales is largely automated: Pension Credit recipients are in the core group and receive it automatically from their energy supplier. A broader group -- households with low income and high energy costs living in poorer-rated homes -- is identified through data-sharing between HMRC, DWP, and energy suppliers.
If you believe you qualify but have not received the rebate automatically, contact your energy supplier. You must be with a participating supplier -- most of the larger suppliers are obligated to offer it, but smaller suppliers may not be. In Scotland the scheme is structured differently, with some suppliers running direct application processes rather than relying entirely on automated matching.
Winter Fuel Payments were restricted from winter 2024/25 onwards. To receive them, you now need to be in receipt of Pension Credit or another qualifying means-tested benefit in the qualifying week (usually mid-September). The payments remain GBP 200 for most households and GBP 300 for those aged 80 or over. This tightening has made the under-claiming of Pension Credit an even more important issue: a single person entitled to Pension Credit but not claiming it may be missing not only the GBP 238.00 per week minimum guarantee, but also the Winter Fuel Payment, Warm Home Discount, and ECO4 eligibility all at once.
Cold Weather Payments of GBP 25 are made for each seven-day period where the average temperature in your local area is forecast or recorded at 0 degrees C or below. These are paid automatically to those receiving qualifying benefits -- including Pension Credit, income-based JSA, income-related ESA, Income Support, Universal Credit, and Support for Mortgage Interest. Payments are typically made within 14 working days of the cold period.
The official starting point for most energy efficiency support in England is the Simple Energy Advice service at gov.uk. Entering your postcode, current heating type, and benefit status generates a personalised list of schemes and local contacts. This is the safest route because it avoids rogue traders and lead-generation companies that may charge referral fees or use high-pressure sales tactics.
For ECO4 and GBIS specifically, the process typically works like this:
For the Boiler Upgrade Scheme, you contact an MCS-certified heat pump installer directly. They apply for the voucher on your behalf once an installation date is agreed. The GBP 7,500 is deducted from your invoice -- you pay the remainder. Vouchers are valid for three months and can be extended once.
Unfortunately, energy efficiency scams are common. Warning signs include cold callers or door-knockers claiming you are "automatically entitled" to free measures without a proper assessment, requests for upfront payment before works are completed, and pressure to sign contracts immediately. Legitimate ECO4 and GBIS installers do not charge householders and do not cold-call. Always verify that an installer is registered with TrustMark and, for heat pumps, is MCS-certified. Check these registrations on the official websites, not on documentation provided by the installer alone.
If you have already paid a deposit to a company that turns out not to be legitimate, contact Action Fraud (0300 123 2040) and your local Citizens Advice. Your bank may be able to recover the payment under the Payment Services Regulations.
Energy grants interact with your wider financial picture in several important ways. The grants themselves are not taxable -- you do not include them in your Self Assessment return and they do not affect your benefit entitlement calculations. A GBP 7,500 Boiler Upgrade Scheme grant does not count as income for tax or means-testing purposes.
However, the eligibility triggers for ECO4, the Warm Home Discount, and Winter Fuel Payments are closely tied to the benefit system. Pension Credit is the single most valuable gateway benefit for older households. With a minimum guarantee of GBP 238.00 per week for a single person (GBP 12,376 per year) and GBP 363.25 for a couple (GBP 18,889 per year), Pension Credit tops up income to these floors. It also unlocks the Warm Home Discount, Cold Weather Payments, free NHS dental treatment, and Housing Benefit.
For working-age households, Universal Credit eligibility for ECO4 depends partly on earnings. The net earnings threshold varies by family circumstances but is broadly around GBP 1,381 per month for a couple with children. If your earnings fluctuate month to month, you may qualify in some assessment periods and not others -- it is worth checking with your energy supplier in any month where your earnings are lower.
Child Benefit is another indirect connection worth noting. If your household income is between GBP 60,000 and GBP 80,000, the High Income Child Benefit Charge (HICBC) claws back Child Benefit at a rate of 1% per GBP 200 of income above GBP 60,000. Child Benefit itself is GBP 26.05 per week for the first child and GBP 17.25 for subsequent children in 2026/27. Reducing your adjusted net income through pension contributions could keep you within Child Tax Credit eligibility (if you still have legacy Child Tax Credit rather than Universal Credit), which in turn could qualify you for ECO4.
Pension contributions are worth particular attention for those whose income sits just above a means-testing threshold. Contributions to a pension reduce your adjusted net income, which is also the figure used for the personal allowance taper (incomes between GBP 100,001 and GBP 125,140 face an effective 60% marginal rate as the GBP 12,570 personal allowance is withdrawn). Making additional pension contributions up to the annual allowance of GBP 60,000 (subject to the MPAA of GBP 10,000 if you have already accessed pension funds flexibly) can therefore serve a dual purpose: rebuilding retirement savings while potentially unlocking benefit-linked energy grants.