ECO4 Ends December 2026: Who Qualifies and How to Apply in Time

The deadline: 31 December 2026

ECO4 ends on 31 December 2026. The scheme was originally due to close on 31 March 2026 but was extended by nine months following a government consultation in 2025. The government has confirmed there will be no further extension and no direct successor supplier obligation, with future support expected to come through the Warm Homes Plan instead. That makes this a genuine hard deadline. Because eligibility checks, home assessments and installation all take time, anyone who might qualify should start the process months ahead rather than leaving it to December. If your application is not approved and the work scheduled in time, you miss the funding. This guide explains who qualifies and how to apply while the scheme is still open.

What ECO4 covers

ECO4 (the Energy Company Obligation) requires larger energy suppliers to fund energy-efficiency improvements in eligible homes. It takes a whole-house approach, aiming to lift the least efficient properties up the EPC scale, so it often funds several measures together. Eligible measures include solar PV, insulation (loft, wall and underfloor), heating upgrades such as heat pumps and efficient storage heaters, and heating controls. Solar is usually funded as part of a wider package rather than on its own, and the scheme prioritises homes rated EPC D to G. The work is carried out by the scheme's own approved, certified contractors, not chosen by you, and there is normally no cost to the eligible household for the funded measures.

Who qualifies for ECO4

There are two main routes to eligibility. The benefits route covers households receiving qualifying means-tested benefits, such as Universal Credit, Pension Credit, income-based Jobseeker's Allowance and several others. The ECO4 Flex route is run through local authorities and widens eligibility to households on lower incomes (commonly a threshold around £31,000) or with health vulnerabilities made worse by cold, even if they do not claim a listed benefit. Exact Flex criteria are set locally, so they vary by council. In both cases the home usually needs a low EPC rating to qualify, because the scheme targets the least efficient properties first.

• Benefits route: you receive a qualifying means-tested benefit.
• ECO4 Flex route: lower household income (often under ~£31,000) or cold-related vulnerability, assessed by your local authority.
• Property: typically EPC D to G, as the scheme prioritises inefficient homes.
• Tenure: owner-occupiers and, with landlord consent, some private tenants.

How to apply before it closes

1. Check your eligibility through your energy supplier's ECO4 page or an approved ECO4 installer.
2. If you are not on a listed benefit, ask your local council about ECO4 Flex eligibility.
3. Arrange the home assessment that confirms your EPC rating and suitable measures.
4. Get the funded measures approved and scheduled, allowing weeks for the work.
5. Make sure everything completes before 31 December 2026, the firm deadline.

What documents and proof you need to apply

Applying for ECO4 requires you to evidence your eligibility, and the documents differ depending on whether you qualify through the benefits route or ECO4 Flex. For the benefits route, you typically need a recent benefits letter or Universal Credit statement showing your name, address, and the qualifying benefit. For ECO4 Flex, your local authority will ask for proof of household income, which may include payslips, tax credits documentation, pension statements, or a self-assessment tax return. In both cases you will also need proof of address and ownership or tenancy, such as a council tax bill or tenancy agreement. If you are a private tenant applying with landlord consent, you will need written permission from the landlord. Having these documents ready before you start the process avoids delays at the assessment stage.

• Benefits route: recent benefits letter or Universal Credit statement.
• ECO4 Flex: proof of household income (payslips, tax credits, pension).
• Both routes: proof of address, proof of ownership or tenancy, photo ID.
• Private tenants: written landlord consent for the works.
• Your current EPC: if you have one. If not, the scheme arranges an assessment.

How long the ECO4 process takes from start to finish

The ECO4 process is not instant, and understanding the timeline helps you plan ahead of the 31 December 2026 deadline. From initial enquiry to completed installation, the process typically takes between 8 and 16 weeks, though it can stretch longer during busy periods or if additional property assessments are required. The first stage is eligibility verification, which may take 2 to 4 weeks depending on your local authority's Flex processing times or your supplier's benefits check. Next comes a home survey to confirm the property's EPC rating and identify suitable measures, usually arranged within 2 to 3 weeks of approval. After that, the contractor is assigned and a date booked for installation, which depends on their capacity but typically adds another 3 to 6 weeks. Given this timeline, anyone hoping to complete before the December deadline should begin the process no later than early autumn 2026.

How ECO4 Flex differs between local authorities

ECO4 Flex is not a single national set of rules. Each local authority publishes its own Statement of Intent setting out which households qualify under its flexible eligibility criteria. While the broad framework is similar across councils, the specific income thresholds, vulnerability definitions, and priority categories can vary. In Gloucestershire, different district councils may weight certain criteria more heavily, for example prioritising households with occupants who have cold-sensitive health conditions, or homes in specific areas of fuel poverty. This means a household that does not qualify under one council's Flex criteria might qualify under another's, though in practice your application goes to the council for the area where your home is located. Check your own council's published Statement of Intent, or ask the Warm and Well Adviceline to clarify which Flex criteria apply to your property's district.

Spotting ECO4 scams

As the ECO4 deadline approaches, scam operators become more active, exploiting urgency. Common tactics include cold calls claiming you have been 'pre-approved' for free insulation or solar, doorstep visits demanding an upfront fee to 'reserve your funding', and fake websites imitating energy suppliers or government schemes. Genuine ECO4 applications go through your energy supplier or local authority and are assessed before any work is promised. No legitimate ECO4 route charges you an application fee or requires payment to secure a place. If you are contacted out of the blue with a claim that sounds too good or too urgent, verify it independently through your supplier or council before engaging. Report suspected fraud to Action Fraud or your local Trading Standards office.

• No upfront fees. ECO4 is free to eligible households. Any request for payment is a red flag.
• No cold-call pre-approvals. Eligibility requires verification; nobody can approve you by phone without documentation.
• Check contractor credentials. Legitimate ECO4 contractors are TrustMark-registered and MCS-certified.
• Verify through official channels. Contact your energy supplier or council directly rather than using numbers given by the caller.

If you do not qualify

If you fall outside ECO4, other support still applies. In Gloucestershire, the Warm Homes Local Grant through Warm and Well uses a household income threshold of £36,000 and an EPC D to G requirement, so some households who miss ECO4 qualify there instead. Every homeowner also benefits from 0% VAT on solar until March 2027 and can earn Smart Export Guarantee income on an MCS-certified system. If you are paying privately, comparing quotes from vetted, accredited installers is the way to keep costs down. We can match you with suitable local installers so a privately funded system meets the same standards a grant scheme would require.