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If you have heard that UK homes can receive free insulation, a brand-new boiler, or even solar panels, then the chances are that the money was made available through ECO4. ECO4 is one of the oldest and most generous schemes when it comes to energy efficiency in the UK, and by 2026, it will continue to be one of the quickest ways for qualifying individuals to get a free home improvement package. This guide will tell you all you need to know about ECO4 – from its definition and who qualifies, to what it includes, the amount of funding, and how to apply.

What Is the ECO4 Scheme?

ECO4 stands for the fourth phase of the Energy Company Obligation — a government-mandated scheme that requires large energy suppliers to fund energy efficiency improvements for low-income and vulnerable households. It’s administered by Ofgem, the UK’s energy regulator, and funded not by general taxation but by an obligation placed directly on major suppliers, who pass on qualifying households’ upgrade costs as part of their regulatory requirements.

Unlike some grants that offer a fixed cash amount, ECO4 works by funding entire packages of measures — sometimes covering 100% of the cost — for homes that meet the criteria. This is why it’s often described as providing “free” home upgrades: many qualifying households pay nothing at all for insulation, heating replacements, or renewable technology.

ECO4 is scheduled to close on 31 December 2026, after which the government’s Warm Homes Plan is expected to take over funding for similar measures. That makes 2026 the last full year to apply under the current rules.

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Who Is Eligible for ECO4?

Eligibility for ECO4 is built around two main factors: your household income or benefits status, and your property’s current energy efficiency.

Benefits and Income Criteria

You’re likely to qualify if someone in your household receives one of the following means-tested benefits:

• Universal Credit
• Pension Credit (Guarantee Credit)
• Income Support
• Income-based Jobseeker’s Allowance (JSA)
• Income-related Employment and Support Allowance (ESA)
• Child Tax Credit (with income below the relevant threshold)
• Working Tax Credit (with income below the relevant threshold)
• Housing Benefit

If you don’t receive any of these but still consider yourself on a low income, don’t rule yourself out. Local Authority Flexible Eligibility (LA Flex) allows councils to approve applicants who fall outside the standard benefits list but who are considered vulnerable — for example, due to age, a long-term health condition, or disability that’s made worse by living in a cold home. Rules for LA Flex vary by council, so it’s worth checking directly with your local authority even if you’re unsure.

Property Criteria

Your home’s current Energy Performance Certificate (EPC) rating matters just as much as your income. ECO4 is generally targeted at properties rated D, E, F, or G — in other words, homes that are below the more efficient A–C bands and stand to benefit the most from upgrades. If your home is already rated A or B, you’re unlikely to qualify for ECO4, even if you meet the income criteria, simply because the scheme prioritises the least efficient homes.

Tenure

ECO4 is available to homeowners, private tenants, and social housing tenants, though the process differs slightly for each:

• Homeowners apply directly through an approved installer or energy supplier.
• Private tenants need landlord consent before work can go ahead, since it involves permanent changes to the property.
• Social housing tenants may be eligible depending on the current EPC rating of their home, though social landlords often coordinate improvements as part of broader estate-wide programmes.

What Does ECO4 Cover?

ECO4 funds a wide range of measures, and many households qualify for more than one at once as part of a coordinated upgrade package. The most common measures include:

Insulation

• Loft insulation
• Cavity wall insulation
• Solid wall insulation (internal or external)
• Underfloor insulation
• Room-in-roof insulation

Heating

• Boiler replacements (including first-time central heating for homes that have never had it)
• Heating controls and thermostats
• In some cases, heat pump installations, often layered with Boiler Upgrade Scheme funding for maximum support

Renewable technology

• Solar PV panels (a smaller share of ECO4-funded measures, but available where the home is suitable)
• In limited cases, solar thermal systems

Ventilation

• Improvements needed to maintain healthy air quality after insulation work, which is often required as part of the same package rather than optional add-on

Because ECO4 measures are typically installed as part of a “whole-house” approach, an assessor will usually recommend a package tailored to your specific property rather than a single isolated upgrade. For example, a home with solid walls and an old boiler might receive solid wall insulation and a boiler replacement in the same project, since addressing both together produces better results than either alone.

Read more:UK Energy Grants: Complete Guide for Homeowners & Tenants

How Much Is ECO4 Worth?

The value of ECO4 support varies significantly depending on your property and the measures needed, but funding for a single upgrade can run into several thousand pounds, and full packages for the most energy-inefficient homes are sometimes funded entirely, meaning no cost to the household at all.

If ECO4 doesn’t cover the full cost of a specific improvement — which can happen depending on the measure and your local supplier’s funding allocation — you would be responsible for the remaining balance, either paid directly or through a financing arrangement offered by the installer. This is worth clarifying with your installer before work begins, so there are no surprises once the job is complete.

Beyond the upfront funding, the long-term value of ECO4 comes from lower energy bills. Government estimates commonly cited for ECO4-funded improvements suggest households can save a meaningful amount annually on heating costs, on top of the comfort benefits of a warmer, better-insulated home.

How to Apply for ECO4

Applying for ECO4 is more straightforward than many people expect, mainly because you don’t fill out a direct application to the government — the process runs through approved suppliers and installers.

Step 1: Check Your Eligibility

Before contacting anyone, use the government’s eligibility checker on GOV.UK, or a reputable energy grant comparison tool, to get an initial sense of whether you’re likely to qualify based on your benefits and property type.

Step 2: Gather Your Documents

Have the following ready, since they’re commonly requested during the eligibility check:

• Proof of the relevant benefit (an award letter or online statement)
• Proof of address
• Proof of homeownership, or written landlord consent if you’re a tenant
• Your current EPC, if you have one — if not, this can usually be arranged as part of the process

Step 3: Contact an Approved Installer or Energy Supplier

You can approach a participating energy supplier directly, or go through an approved installer who works with ECO4 funding. They will confirm your eligibility, assess your property (sometimes via a home visit or energy survey), and recommend the measures your home qualifies for.

Step 4: Application Submission

The installer or supplier submits the application on your behalf. This is a key point worth repeating: you should never need to submit a separate application yourself, and you should never be asked to pay someone simply to “process” your ECO4 application — legitimate installers are compensated through the scheme’s funding structure, not by charging applicants upfront fees.

Step 5: Eligibility Review

Your application is checked to confirm your income level, property type, and existing energy efficiency measures match the scheme’s criteria. This stage can also involve a local authority review if you’re applying through LA Flex rather than the standard benefits route.

Step 6: Installation

Once approved, the installer schedules the work. For straightforward measures like loft insulation, the process from initial application to completed installation can take as little as two weeks; more complex packages involving multiple measures will naturally take longer.

ECO4 and Local Authority Flexible Eligibility (LA Flex)

LA Flex deserves its own mention because it’s often overlooked by people who assume ECO4 is only for benefit claimants. Under LA Flex, your local council can set its own criteria for who counts as low-income or vulnerable, which means:

• You might qualify even without receiving a qualifying benefit, if your household income falls below a locally defined threshold.
• Health conditions worsened by cold housing — respiratory illness, cardiovascular conditions, or certain disabilities — can support an LA Flex application even without a benefits match.
• Criteria differ between councils, so it’s genuinely worth checking with your local authority directly rather than assuming you don’t qualify based on national rules alone.

If you’re unsure whether you meet the standard criteria, applying isn’t a wasted effort — installers and councils regularly work with borderline cases and can advise on the best route.

ECO4 for Landlords and Private Rented Properties

If you’re a landlord, ECO4 can be a valuable tool for improving your property’s EPC rating cost-effectively, particularly with minimum energy efficiency standards for rented homes tightening. Where your tenant meets the ECO4 eligibility criteria, you can access funding for insulation or heating measures with your consent as the property owner, reducing how much you need to spend privately to bring the property up to standard. Any ECO4-funded work also counts toward the capped amount landlords are expected to spend on compliance improvements, meaning grant funding directly reduces your own financial exposure.

Combining ECO4 With Other Schemes

ECO4 doesn’t exist in isolation, and many households benefit from combining it with other forms of support:

• The Great British Insulation Scheme (GBIS): though GBIS closed to new applicants in early 2026, anyone who missed that window can still pursue insulation through ECO4 instead.
• The Boiler Upgrade Scheme (BUS): if your ECO4 package includes a heat pump, it may be layered with BUS funding to reduce the cost further.
• 0% VAT: any portion of the cost you do pay out of pocket for eligible measures — solar, batteries, heat pumps, insulation — benefits from the 0% VAT rate currently in place until March 2027.
• Warm Home Discount: separate from ECO4, this can reduce your winter electricity bill if you’re on a qualifying benefit, and applying for one doesn’t affect your eligibility for the other.

What Happens When ECO4 Ends?

ECO4 is due to close to new applications on 31 December 2026. The government’s Warm Homes Plan is expected to pick up funding for broadly similar measures from January 2027, delivered largely through local authorities rather than a single national scheme. However, full details of local eligibility criteria, funding levels, and the specific measures covered are still being finalised in many areas as of mid-2026.

The practical implication is straightforward: if you think you’re eligible for ECO4-funded measures now, it’s worth applying well before the deadline rather than waiting to see what the Warm Homes Plan offers, since qualifying under the current rules doesn’t guarantee you’ll qualify under whatever replaces it.

Read more:UK Energy Grants 2026: Eligibility, How to Apply & Latest Schemes

Common Mistakes That Delay ECO4 Applications

• Not having a current EPC. This is one of the most common hold-ups — without it, your property’s efficiency rating can’t be confirmed against the scheme’s criteria.
• Applying without checking LA Flex first if you’re borderline. Some people assume they’re ineligible without checking whether their council’s local criteria would cover them.
• Using an installer that isn’t ECO4-approved. Not every local tradesperson can process ECO4 funding — confirm the installer is registered to deliver ECO4 measures before agreeing to any work.
• Leaving it too close to the December 2026 deadline. Applications submitted in the final weeks of the scheme risk not completing installation in time.

Conclusion

Despite all the changes that took place, ECO4 continues to be one of the most useful – and least used – home energy grants available in the UK. If you are a family eligible for certain types of benefits living in a home with a poorer energy efficiency rating, you might get completely free-of-charge insulation or even a new heating installation or solar panels, with everything from the application to the actual grant being done by an accredited installer without having to deal with the bureaucracy yourself. Even if you do not meet all the standard criteria, Local Authority Flexible Eligibility may give you a reason to talk to your local authority first.

The best thing would be to apply for this program now while it closes at the end of December 2026 and while the local eligibility criteria of the Warm Home Plans is still unknown. You will need to do the eligibility check, have a valid EPC, and use only accredited installers – but make sure to verify all information about this scheme on the GOV.UK website or with your local council.