The Warm Homes Plan represents the largest public investment in domestic energy efficiency in British history, and for homeowners and installers considering external wall insulation, it opens a clearer, better-funded pathway to a warmer, more affordable home. This guide breaks down exactly what the Plan means for EWI projects in 2026, which grant schemes remain active, who qualifies, and how to secure funding before key deadlines pass.
For a broader overview of every UK funding route, including devolved nation schemes, the complete grant funding guide for external wall insulation covers the full picture alongside the specific Warm Homes Plan detail explored here.
What Is the Warm Homes Plan?
Published by the Department for Energy Security and Net Zero in March 2026, the Warm Homes Plan commits £15 billion of public investment to upgrade up to five million homes by 2030. The Plan targets three outcomes simultaneously: cutting household energy bills, lifting up to one million families out of fuel poverty, and reducing the roughly one-fifth of UK greenhouse gas emissions produced by buildings. External wall insulation is explicitly listed among the eligible measures because it delivers measurable, lasting improvements to building fabric performance — addressing Part L compliance, EPC uplift, and long-term energy bill reduction in a single intervention.
- £5 billion for low-income capital grants: direct funding delivered through the Warm Homes: Local Grant and Social Housing Fund, with an additional £600 million channelled through the new Warm Homes Fund to support the retrofit supply chain.
- £2 billion for consumer loans: new zero- and low-interest finance available to homeowners who do not qualify for grants but want to invest in insulation, solar panels, or heat pumps.
- New Warm Homes Agency: a single national body consolidating delivery functions previously split across government departments and Ofgem, designed to co-ordinate local authority programmes and streamline the homeowner experience.
How the Plan Changes EWI Funding in 2026
The Warm Homes Plan reshapes the grant landscape for external wall insulation in three important ways. The Great British Insulation Scheme (GBIS) closed on 31 March 2026, removing one significant funding route for middle-income households in council tax bands A–D. The government confirmed there will be no successor supplier obligation after ECO4, ending the energy-company-funded model that has driven millions of insulation installations since 2013. And the Warm Homes: Local Grant, backed by the broader Plan investment, replaces the supplier-obligation approach with a council-led, government-funded model expected to continue well beyond 2026.
For trade installers and contractors, the practical effect is a shift from supplier-driven referral networks to local-authority-administered programmes. Homeowners benefit from a simpler application route through their council and a single point of contact for surveys, measure recommendations, and installation management. The strengthened quality assurance measures introduced after ECO4 concerns — including mandatory Retrofit Coordinator site visits, enhanced supplier audits, and tighter TrustMark enforcement — carry forward into all Warm Homes Plan delivery.
Grant Schemes Still Open for EWI
ECO4 — Extended to 31 December 2026
ECO4 remains the most established route to fully funded external wall insulation for low-income households. Originally due to end on 31 March 2026, the scheme received a nine-month extension following a government consultation, with the new deadline confirmed as 31 December 2026. Eligibility is determined primarily through receipt of means-tested benefits such as Universal Credit, Pension Credit, or Income Support, and the property should typically hold an EPC rating of E, F, or G. Under ECO4 Flex, local authorities can also refer households earning below £31,000 annually. The solid wall minimum requirement remains in place through the extension, meaning energy suppliers must continue delivering EWI alongside other measures.
Warm Homes: Local Grant — Ongoing
The Warm Homes: Local Grant, administered by local councils in England, offers fully funded energy-efficiency improvements including external wall insulation. The property must be privately owned, located in England, and hold an EPC rating of D, E, F, or G. Household income must normally be £36,000 per year or less, though eligibility can extend to higher-income households if someone in the home receives qualifying benefits or the property falls within a designated postcode area. Councils arrange a home survey, recommend appropriate measures, and organise the installation at no cost to the householder. The scheme operates through participating local authorities and is expected to continue beyond 2026 with additional low-income capital funding from 2027/28 onwards.
Warm Homes: Social Housing Fund
Social housing providers access EWI funding through the Warm Homes: Social Housing Fund (WH:SHF), which targets the upgrade of social housing stock currently rated below EPC Band C. Local authorities, combined authorities, and registered providers of social housing can apply for programme funding to deliver whole-estate retrofit schemes. The government's Warm Homes Plan commits to consolidating the Local Grant and Social Housing Fund into a single integrated scheme for low-income households over time, simplifying the delivery landscape for large-scale EWI programmes.
| Scheme | Status (April 2026) | End Date | EWI Eligible | Key Requirement |
|---|---|---|---|---|
| ECO4 | Open (extended) | 31 December 2026 | Yes | Means-tested benefits or Flex referral |
| GBIS | Closed | 31 March 2026 | N/A | No longer accepting applications |
| Warm Homes: Local Grant | Open | Ongoing | Yes | Income ≤ £36,000 + EPC D–G |
| WH: Social Housing Fund | Open | Rolling waves | Yes | Social housing provider application |
Eligibility and How to Apply
Checking eligibility for EWI grant funding takes a matter of minutes. For the Warm Homes: Local Grant, the starting point is the GOV.UK online application at gov.uk/apply-warm-homes-local-grant, where a short questionnaire confirms whether the household meets the income threshold, benefit criteria, and property requirements. The local council typically responds within ten working days to arrange a home survey. For ECO4, homeowners usually enter the scheme through their energy supplier, an approved installer network, or a local authority Flex referral — the PAS 2035 homeowner and retrofit coordinator guide explains the process from assessment to sign-off.
Whichever route applies, the installation itself follows the same regulated pathway. A PAS 2035 Retrofit Coordinator conducts a dwelling assessment, specifies the insulation type, thickness, and render system, and oversees the work carried out by a PAS 2030 certified installer. Post-installation, the property receives an updated EPC, and the measures are registered with TrustMark alongside an Insurance Backed Guarantee. Households earning above the grant thresholds can explore the new zero- and low-interest consumer loan facility being delivered as part of the Warm Homes Plan — backed by an initial £2 billion of government support.
Key Deadlines for 2026
- 31 March 2026 — GBIS Closed: the Great British Insulation Scheme ended on this date. No new applications are being accepted, and any projects not fully delivered by the deadline fall outside the scheme's scope.
- 31 December 2026 — ECO4 Closes: the extended deadline gives suppliers and installers until the end of the year to complete existing obligations, but homeowners should apply early because scheme capacity is constrained by both funding allocations and installer availability.
- From 2027 — Expanded Warm Homes Investment: additional low-income capital funding of £1.5 billion enters the delivery pipeline from 2027/28, and the government intends to consolidate low-income schemes into a single programme administered through the new Warm Homes Agency.
Key Takeaway: The Warm Homes Plan secures £15 billion for domestic energy upgrades, with external wall insulation remaining a core funded measure. ECO4 runs until December 2026, the Warm Homes: Local Grant continues for low-income households, and a new government-funded delivery model replaces the supplier-obligation approach — making early application the surest route to fully funded EWI.
What This Means for Trade Installers and Homeowners
For trade installers, the transition from supplier obligations to government-funded local authority programmes changes the referral and procurement model but not the demand signal. The Warm Homes Plan's five-million-home target and the retention of solid wall minimum requirements under ECO4 mean EWI installation volumes are expected to remain strong through 2026 and beyond. Aligning with PAS 2035-compliant delivery networks and maintaining TrustMark registration positions businesses to access the expanding pipeline of publicly funded work. Specifying certified EPS insulation boards or mineral wool slabs from recognised manufacturers ensures that every installation meets the audit standards now enforced across all government-backed schemes.
For homeowners, the message is straightforward: grant funding for external wall insulation is available now, and applying promptly secures the best chance of approval before scheme capacity tightens. A successful EWI retrofit typically improves a property's EPC by one to three bands, reduces annual heating energy demand, and delivers a home that stays warmer through the winter without increasing energy bills. The entire process — from initial survey through to a finished, rendered facade — is typically managed by the council or approved installer at no cost to qualifying households.
Written by Mariusz Saja. Technically reviewed by Rafał Wyrzykowski. Last reviewed April 2026.
Frequently Asked Questions
How much can I receive toward external wall insulation under the Warm Homes Plan?
Under the Warm Homes: Local Grant, eligible households can receive fully funded external wall insulation at no personal cost — the council arranges and pays for the entire installation. ECO4 similarly covers the full cost for qualifying low-income households. The exact value depends on property size, insulation type, and local council funding allocation, but grants typically cover installations valued between £10,000 and £15,000 per property, subject to the project assessment conducted during the home survey.
Does the Warm Homes Plan fund EWI for landlords as well as homeowners?
Private landlords with eligible tenants can access EWI funding through ECO4 and the Warm Homes: Local Grant, though the landlord may be required to contribute toward some of the improvement costs. Social housing providers apply directly through the Warm Homes: Social Housing Fund. The Warm Homes Plan also introduces new minimum energy efficiency standards requiring privately rented properties to meet specified EPC thresholds by 2030, creating both regulatory motivation and financial support for landlords to invest in EWI upgrades.
What happens to EWI grant funding after ECO4 closes in December 2026?
The government has confirmed there will be no successor supplier obligation after ECO4. However, the Warm Homes Plan commits £15 billion over the current Spending Review period, with additional low-income capital funding entering delivery from 2027/28. The Warm Homes: Local Grant is expected to remain active and expand, and the new Warm Homes Agency will co-ordinate a consolidated low-income scheme — ensuring that grant-funded EWI system installations continue beyond the ECO4 closure.
Is PAS 2035 certification required for grant-funded EWI installations?
All retrofit work delivered under ECO4, GBIS, and the Warm Homes: Local Grant must comply with the PAS 2035 framework. This means a qualified Retrofit Coordinator oversees the project from design to completion, and the installer holds PAS 2030 certification. Updated requirements introduced in 2025 now mandate site visits by Retrofit Coordinators and enhanced audit processes, providing stronger protection for homeowners and ensuring every funded EWI installation meets consistent quality standards.