How to Apply for ECO4 Grant

How to Apply for an ECO4 Grant in the UK (2026 Step-by-Step Guide)

The ECO4 scheme provides fully funded home energy improvements — insulation, boiler repair or replacement, heat pumps, and solar — to eligible UK households at no cost. If you or someone in your household receives a qualifying means-tested benefit, and your home is rated EPC band D to G, you may qualify. The scheme closes on 31 December 2026, and with applications taking 10 to 18 weeks to complete, the window to act is narrowing fast.

Important: InstantGrant is an independent grant information and application-support service. We are not the UK government, Ofgem, or any energy supplier. We do not deliver ECO4, award grants, or contact households on behalf of any energy company. All information on this page is verified against GOV.UK and official Ofgem sources. Always confirm your eligibility directly with your energy supplier or local council before committing to any work.

This guide covers exactly who qualifies, the full step-by-step application process, what documents you need, how long it takes, and what to do if you do not qualify through the standard benefits route.

What ECO4 Is — and Where the Money Actually Comes From

ECO4 stands for the Energy Company Obligation, fourth phase. It is a UK government scheme that legally requires large energy suppliers — British Gas, E.ON Next, EDF, OVO, Octopus Energy, ScottishPower, Shell Energy, and others — to fund home energy improvements for eligible low-income and vulnerable households.

ECO4 Is Not Funded by Government Tax

This is something most guides get wrong by omission. ECO4 is not funded directly from central government taxation. It is a regulatory obligation placed on energy suppliers by Ofgem. Suppliers recover the cost across all their customers' bills. The total budget across the four-year scheme (April 2022 to December 2026) is approximately £4 billion.

Understanding this matters for one practical reason: when suppliers have met their individual obligation targets, they stop taking on new ECO4 referrals. As the December 2026 deadline approaches, some suppliers are closer to meeting their quota than others. If one supplier declines your referral, it is worth trying another.

What ECO4 Takes a Whole-House Approach

ECO4 does not just replace one thing and leave. Its aim is to bring your home up to at least EPC Band C through a tailored package of improvements. A typical funded package might include loft insulation, cavity wall insulation, and a boiler replacement combined — rather than any single measure in isolation.

ECO4 Eligibility: Who Qualifies in 2026

There are two routes to ECO4 eligibility: the standard benefits route, and the ECO4 Flex route for lower-income households without qualifying benefits.

Route 1: Qualifying Benefits

If you or anyone in your household receives one of the following benefits, you are likely eligible for ECO4 under the standard route:

• Universal Credit

• Pension Guarantee Credit

• Pension Savings Credit

• Income Support

• Income-based Jobseeker's Allowance (JSA)

• Income-related Employment and Support Allowance (ESA)

• Child Benefit

• Housing Benefit

Property condition: Your home must also have an EPC rating of D, E, F, or G to qualify. The lower the EPC rating, the higher the priority for measures under the scheme.

Route 2: ECO4 Flex

ECO4 Flex allows local councils to refer households that do not receive the qualifying benefits listed above but are still in or at risk of fuel poverty. Councils set their own local income thresholds — typically around £31,000 to £36,000 household income — and may also refer based on area-level deprivation indicators without requiring proof of individual income.

ECO4 Flex is significantly undercovered by most guides. If you do not receive qualifying benefits but have a low household income and a poorly rated EPC, contact your local council directly and ask whether they are running an ECO4 Flex referral scheme in your area.

Who Counts as Eligible for the Property Type

Owner-occupiers: Must have an EPC rating of D, E, F, or G. Private renters: Must have an EPC rating of E, F, or G, and must have the landlord's written permission before any work can proceed. The landlord does not pay — the work is funded through ECO4 — but their consent is legally required. Social housing tenants: Must have an EPC rating of E, F, or G and qualify for insulation or a first-time heating system installation.

Step-by-Step: How to Apply for ECO4

The ECO4 application process does not involve a single central form you fill in yourself. It works through energy suppliers and their registered installer networks. Here is the full process from start to finish.

Step 1: Check Your EPC Rating

Before contacting anyone, find out your home's current Energy Performance Certificate rating at the GOV.UK EPC register: gov.uk/find-energy-certificate. If your home is rated A, B, or C, you do not qualify under standard ECO4. Ratings of D, E, F, or G make you potentially eligible.

If your EPC is more than 10 years old, a new assessment may be needed as part of the process. Your installer will arrange this.

Step 2: Gather Your Documents

Prepare the following before you make contact with a supplier or installer:

• A recent DWP benefit award letter dated within the last 3 months (for the benefits route)

• Your EPC certificate or the certificate number from the GOV.UK register

• Proof of property ownership (if you own the home) or your tenancy agreement (if you rent)

• Landlord's contact details and written consent (for private renters)

Having documents ready speeds the process significantly. Missing documents are the most common reason for application delays.

Step 3: Contact Your Energy Supplier or an Ofgem-Registered Installer

You have two points of entry into the ECO4 scheme:

Option A: Contact your energy supplier directly. Call the ECO4 or energy efficiency team at your current supplier. All major suppliers operating ECO4 are listed with contact details on the Ofgem website. You do not have to use your current supplier — you can approach any ECO4-obligated supplier.

Option B: Contact an Ofgem-registered ECO installer. Independent installers registered with Ofgem can refer you to a supplier's ECO4 obligation. Search for TrustMark-approved ECO4 installers in your area.

Option C: Contact your local council. If you are applying through the ECO4 Flex route, your local council is the starting point. Ask their housing or energy efficiency team whether they are running an ECO4 Flex referral scheme.

Step 4: Initial Eligibility Check

Once you make contact, the supplier or installer carries out an initial eligibility check. This confirms your benefit status, your EPC rating, and the basic suitability of your property for the measures available under ECO4. This stage is free. You are not committed to anything at this point.

Step 5: Retrofit Assessment (PAS 2035)

If the initial check confirms eligibility, a qualified Retrofit Assessor visits your home. This assessment, carried out under the PAS 2035 standard, determines exactly which measures your property needs to reach the ECO4 target of EPC Band C. The assessment is free to you.

The assessor produces a specification — a formal document listing the exact measures to be installed. You cannot choose your measures or swap them out. The measures are determined by what the assessment says is needed.

Step 6: Funding Confirmation and Installation Scheduling

Once the specification is agreed, the installer submits it for funding approval. After approval, installation is scheduled. The installer carries out all work. You pay nothing.

Step 7: Post-Installation

After installation, the installer registers the work with Ofgem and updates your EPC. If you are unhappy with any work carried out, contact the installer first. If they do not resolve the issue, contact Citizens Advice.

How Long Does ECO4 Take?

From first contact to installation complete, ECO4 typically takes 10 to 18 weeks in 2026. Here is a realistic breakdown:

Peak demand between September and February can extend these timelines by 30 to 50 percent. With the scheme closing 31 December 2026, applications started in autumn 2026 carry a significant risk of not completing in time. The safest approach is to start the process now.

What ECO4 Covers

A standard ECO4 package is tailored to your property. Common measures include:

• Loft insulation

• Cavity wall insulation

• Solid wall insulation (internal or external)

• Boiler repair or replacement

• Air source heat pump

• Solar PV panels

• First-time central heating installation

The value of an ECO4 package varies widely depending on what your home needs. Insulation packages typically range from £2,500 to £14,000. Full whole-house retrofits including heating upgrades can reach £15,000 to £30,000 in some cases, fully funded.

An Important Warning About Solid Wall Insulation

GOV.UK itself flags quality issues with some solid wall insulation fitted through ECO and earlier obligation schemes. If you are offered solid wall insulation under ECO4 and have any concerns about the quality of work, check the GOV.UK guidance at gov.uk/guidance/what-to-do-if-you-have-poor-quality-wall-insulation before proceeding. This is not a reason to avoid the scheme — but it is information you should have before you commit.

What to Do If You Are Told You Do Not Qualify

A number of households are incorrectly told by cold-calling installers that they do not qualify, sometimes because the installer's scheme quota is full or they are only operating in certain areas. Do not accept a single "no" as final.

If one supplier or installer declines your referral, try another. Contact your local council about ECO4 Flex even if you have been told you do not qualify through the benefits route. Contact Citizens Advice, who can advise on eligibility and escalate complaints about incorrect decisions.

Verifying ECO4 Contacts: How to Spot a Scam

GOV.UK explicitly states that installers or agents may contact you directly. Legitimate ECO4 outreach does happen. But so does fraud, and the two can look identical if you are not paying attention.

Red Flags to Watch For

• A caller or doorstep visitor claims to offer a "free government boiler" without asking any eligibility questions

• Any request for an upfront payment or admin fee — ECO4 work is fully funded, no payment is ever required from you

• Pressure to sign paperwork immediately or the offer will expire

• An installer who cannot provide their TrustMark registration number or Ofgem installer registration when asked

How to Verify a Contact Is Genuine

Ask for the company name and Ofgem installer registration number. Check it against the Ofgem ECO installer list on the Ofgem website. If the contact claims to be from a named energy supplier, hang up and call that supplier's official number — found on their website or your bill — to confirm the outreach is genuine.

Report suspected ECO4 fraud to Action Fraud at actionfraud.police.uk or on 0300 123 2040.

ECO4 Availability by UK Nation

ECO4 is available across England, Scotland, and Wales. Northern Ireland runs a separate scheme.

Scotland

Scottish households can access ECO4 through their energy supplier, and also have access to the Warmer Homes Scotland scheme administered by Home Energy Scotland — a separate, fully funded Scottish Government programme for households on qualifying benefits or low incomes. Call Home Energy Scotland free on 0808 808 2282 for a full assessment.

Wales

Welsh households can access ECO4 through their energy supplier, and also through the Nest scheme — the Welsh Government's equivalent for low-income and benefits households. Nest is administered by Warm Wales and can be accessed at nestwales.org.uk.

Northern Ireland

ECO4 does not operate in Northern Ireland. The main equivalent scheme is the Affordable Warmth scheme, delivered by Bryson Energy on behalf of the Northern Ireland Housing Executive. Contact Bryson Energy or the Housing Executive for current availability.

Frequently Asked Questions

How do I apply for an ECO4 grant? Contact your energy supplier's ECO4 team, an Ofgem-registered ECO installer, or your local council (for ECO4 Flex). There is no central government application form. The supplier or installer manages the process on your behalf.

What benefits qualify for ECO4 in 2026? Universal Credit, Pension Guarantee Credit, Pension Savings Credit, Income Support, income-based JSA, income-related ESA, Child Benefit, and Housing Benefit. Your home must also be rated EPC D to G.

Can I apply for ECO4 without qualifying benefits? Yes — through ECO4 Flex. Your local council can refer you if your household income is low enough, even without qualifying benefits. Contact your council directly and ask about their ECO4 Flex scheme.

How long does ECO4 take from application to installation? Typically 10 to 18 weeks in 2026. Starting in autumn 2026 carries a real risk of not completing before the scheme closes on 31 December 2026.

Does ECO4 cover renters? Yes. Private renters can access ECO4 if their home is EPC E, F, or G and they have their landlord's written consent. Social housing tenants may also qualify for insulation or first-time heating.

Is ECO4 available in Scotland? Yes. ECO4 is available in Scotland through energy suppliers. Scottish households can also access Warmer Homes Scotland through Home Energy Scotland on 0808 808 2282.

What if I'm told I don't qualify? Try a different supplier or installer. Contact your local council about ECO4 Flex. Contact Citizens Advice for independent guidance on your eligibility.

How do I know if an ECO4 contact is genuine? Ask for the company's Ofgem installer registration number and verify it on the Ofgem website. Never pay an upfront fee — ECO4 is always fully funded. Report suspicious contacts to Action Fraud.

What does ECO4 actually pay for? Insulation, boiler repair or replacement, heat pumps, solar PV, and first-time central heating systems, depending on what your PAS 2035 Retrofit Assessment specifies for your property.

When does ECO4 close? ECO4 closes on 31 December 2026. Applications take 10 to 18 weeks to complete, so the latest realistic start date is early to mid-autumn 2026.