EWI Grant Funding in the UK: Every Route Still Open

Three routes still pay for grant-funded external wall insulation in the UK, and one of the four that ran last year has now closed. ECO4 continues to the end of December 2026, the Warm Homes: Local Grant carries on through councils in England, and Scotland and Wales run their own programmes. Renders World supplies materials into all of them, so this guide, reviewed in August 2026, sets out what each route funds, who qualifies, and what a funded installation asks of the paperwork.

Which EWI Grant Routes Remain Open in 2026

Grant funding for EWI UK-wide narrowed on 31 March 2026, when the Great British Insulation Scheme ended, leaving ECO4 until 31 December 2026 and the Warm Homes: Local Grant as the routes that still pay for solid-wall work. That leaves a four-month window on the supplier-obligation side and an open-ended one on the council side, which is the single most useful thing to know before booking a survey.

The distinction that matters to a specifier is delivery model. ECO4 is an obligation placed on energy suppliers, so the funding follows the supplier and its installer network. The Warm Homes: Local Grant is capital funding held by local authorities, so availability depends on the council rather than on a supplier's remaining target.

How ECO4 Eligibility Works Before the December Deadline

ECO4 came into force in July 2022 and applies to measures installed from 1 April 2022. Its original end date of 31 March 2026 was pushed back by a nine-month extension to 31 December 2026, granted so suppliers could meet existing targets and installers could remediate non-compliant work. The extension did not raise the obligation, so the same target now spreads across a longer period.

For anyone selling or fitting insulated render, one decision in that extension carries more weight than the date itself: the solid wall minimum requirement and the EFG minimum requirement were both held at their existing levels and must still be achieved by 31 December 2026. Solid-wall measures therefore keep their protected share of ECO4 delivery right to the close. Eligibility rests on a qualifying benefit and on the property's rating, which differs by tenure.

• Owner-occupied: an energy efficiency rating of D, E, F or G.
• Privately rented: a rating of E, F or G, with the owner's permission for the work.
• Social housing: a rating of E, F or G, for insulation or a first heating system.
• Qualifying benefits: Universal Credit, Pension Guarantee Credit, Pension Savings Credit, Income Support, income-based JSA, income-related ESA, Child Benefit or Housing Benefit.

Applications run through an obligated supplier or through a local council taking part in the scheme, and the GOV.UK guidance on the Energy Company Obligation lists both routes. There will be no successor supplier obligation after ECO4; the November 2025 Budget confirmed instead an extra £1.5bn of grant funding for low-income households, bringing the Warm Homes Plan to just under £15bn of capital investment. Government funding for external insulation continues, in other words, but through councils rather than through energy bills.

What the Great British Insulation Scheme Closure Changed

GBIS was designed to deliver single insulation measures quickly to a wider group than ECO4, covering homes rated D to G in council tax bands A to D in England and A to E in Scotland and Wales, without requiring benefit receipt. It ended as planned on 31 March 2026 after delivery fell short of expectations, and mid-scheme changes reassigned ECO4 delivery to its targets so the budget was still met.

Two dates circulate for the closure, and the difference is worth handling deliberately. The scheme end confirmed by the department is 31 March 2026, with installations required to be complete by then; Ofgem's own scheme page still describes GBIS as scheduled to end in April 2026. Treat 31 March 2026 as the operative date and confirm the position of any outstanding job directly with the supplier that took the application, because that is the tighter of the two.

• The GOV.UK eligibility checker has closed, though some energy suppliers were still accepting applications at the point of closure — the supplier is now the only place to confirm status.
• Households that miss ECO4 are pointed towards the Boiler Upgrade Scheme and the Warm Homes: Local Grant rather than a replacement insulation obligation.
• If a GBIS or ECO4 installation is already in place, the remediation route described further down applies regardless of the scheme having ended.

England: Applying Through the Warm Homes: Local Grant

The Warm Homes: Local Grant gives councils in England capital funding to upgrade privately owned homes rated D to G, with household income usually £36,000 a year or less. Higher-earning households can still qualify where the home sits in a designated postcode area or where someone in the household receives certain benefits. Occupants do not contribute to the cost of the measures the council agrees, though a landlord may need to pay for some of them.

Scheme guidance was reissued on 2 July 2026 to reflect the Warm Homes Plan, raising the cost caps and revising household and measure eligibility. The scheme drew a £500 million allocation at the Autumn Budget, and the expression-of-interest window for councils closed on 1 December 2024, so a household's options depend on whether its own authority took an allocation. The scheme-level detail, including how the Warm Homes Plan reshapes it, sits in our guide to the Warm Homes Plan 2026 funding routes for insulation.

1. Check the home's EPC band, tenure and household income against the criteria above.
2. Apply through the Warm Homes: Local Grant service on GOV.UK.
3. Expect the council to make contact, usually within 10 working days, to gather more information and arrange a home survey.
4. The council then organises and pays for the measures it has agreed with the household.

Scotland, Wales and Northern Ireland

The devolved routes are separate programmes with their own assessors, and they are frequently the better answer for a solid-wall home that narrowly misses ECO4. Both open schemes fund wall insulation among a wider measure list, and both are delivered by an approved installer network rather than by the householder's own contractor.

• Scotland: Warmer Homes Scotland offers support worth £10,000 or more to homeowners and private tenants. The home must be a main residence of six months or more, in council tax bands A to G, with a floor area of 230 m² or less, and the household must include someone aged 75 or over without working heating, someone holding a DS1500 or BASRiS certificate, or someone receiving a passport benefit.
• Wales: Nest provides free advice and free home energy efficiency improvements including insulation, a heat pump and solar panels, with eligibility checked by the scheme.
• Northern Ireland: ECO4 and GBIS are Great Britain schemes, so households there sit outside both and should confirm current provision with the Northern Ireland administration before planning a funded retrofit.

Quality Assurance and Remediation on Funded Work

Quality assurance on ECO retrofits is overseen by TrustMark, the government-endorsed quality scheme for domestic retrofit and Ofgem's delivery partner, and the checks tightened considerably after the department flagged potential problems with ECO and GBIS installations on 23 January 2025. The practical effect for a homeowner is that a funded installation now carries more documentation and more site presence than one from a few years ago, which is a step worth getting right at the survey stage.

The controls now in place are the ones the extension relies on, and they are specific enough to ask about before signing.

• An update to PAS 2035/2030:2023 came into force on 30 March 2025, requiring Retrofit Coordinators to conduct site visits and raising qualification standards for Retrofit Designers. Our homeowner's guide to PAS 2035 retrofit coordination covers what the coordinator does at each stage.
• Obligated suppliers have increased audits and site inspections, installers must evidence their work, and TrustMark has added a suspension policy and a risk-assessment tool for detecting non-compliance.
• On-site audits are being offered to every household with external wall insulation installed under ECO4 or GBIS, with the original installer expected to put right anything the audit finds.
• Where insulation is already causing concern, GOV.UK publishes guidance on poor quality wall insulation fitted under ECO, and complaints run first to the installer or the company that guaranteed the work. Our own walkthrough of what to inspect after an ECO4 or GBIS installation sets out the visible checks.

Wider reform is coming with the Warm Homes Plan, which the government has said will bring a simpler, stronger system of oversight and easier access to redress. Scale gives some sense of why: around 4.4 million measures were installed in 2.6 million properties between 2013 and the end of September 2025, with roughly 949,800 of those measures in about 280,100 households under ECO4 alone.

Specifying Materials for a Funded Retrofit

On a funded job the retrofit design, not the installer's van, decides the specification, and the measure is registered against that design. Keeping the whole build-up inside one coherent set of components is what makes the handover file straightforward, because the board, the adhesive, the mesh, the primer and the finish are all recorded together rather than reconciled after the fact.

• The Renders World complete EWI system bundle gathers board, fixings, adhesive, basecoat, mesh, primer and render into one specification priced per square metre.
• Unfunded work is unaffected by scheme deadlines, so a household that misses ECO4 can still specify the same build-up and buy it outright.
• Where a coordinator has named a measure, changes are made through the design rather than at the wall, which keeps the registered record and the installed system in step.

Where to Start This Month

Sequence beats speed on a funded retrofit. Obtain the current EPC first, because an out-of-date certificate is the most common reason a survey slips, then establish which of the routes above applies to the property's nation and tenure before approaching anyone.

Key Takeaway: ECO4 runs to 31 December 2026 with its solid wall minimum requirement intact, and no successor supplier obligation follows it. The Great British Insulation Scheme ended on 31 March 2026. From here the durable routes are the Warm Homes: Local Grant in England and the devolved programmes in Scotland and Wales, so check EPC band, tenure and income against one named scheme rather than applying broadly.

Read across the whole system rather than one layer, because grant paperwork and site sequence follow the same order: substrate, board, fixings, reinforced basecoat, primer, finish. Renders World stocks the insulation, fixings, basecoat and render components a retrofit design typically names, for funded and self-funded projects alike, with the product documentation available at the point of order.

Written by Mariusz Saja. Technically reviewed by Rafał Wyrzykowski. Last reviewed Aug 2026.

Frequently Asked Questions

Can external wall insulation still be fully funded in 2026?

Yes, through two live routes. ECO4 funds measures for eligible households in Great Britain until 31 December 2026, and the Warm Homes: Local Grant has councils in England organise and pay for the agreed improvements, with no contribution from the occupant. Warmer Homes Scotland offers support worth £10,000 or more, and Nest funds improvements in Wales.

Which scheme should a solid-wall home apply to first?

Start with tenure and nation rather than with the scheme. An owner-occupied English home rated D to G on a household income of about £36,000 or less fits the Warm Homes: Local Grant; a benefit-receiving household in Great Britain fits ECO4, which still carries a protected solid wall minimum requirement to the end of December 2026. It is worth having two documents to hand either way:

• the current EPC for the property
• evidence of the qualifying benefit or household income

Does the EPC band have to be a particular rating?

It depends on the route and the tenure. ECO4 accepts an owner-occupied home rated D, E, F or G, and a privately rented or socially rented home rated E, F or G. The Warm Homes: Local Grant accepts D, E, F or G in England. Homes already rated C or above sit outside these thresholds, and unfunded retrofit remains available to them.

What happens to insulation funding after ECO4 ends?

No successor supplier obligation follows ECO4. The November 2025 Budget added £1.5bn of grant funding aimed at low-income households, taking the Warm Homes Plan to just under £15bn of capital investment, and the Warm Homes: Local Grant continues to deliver through councils. The delivery model shifts from energy suppliers to local authority capital programmes.

What if something is wrong with a funded installation?

There is a defined route and it stays open after a scheme closes. TrustMark oversees quality assurance for ECO retrofits, on-site audits are being offered to every household with external wall insulation installed under ECO4 or GBIS, and the original installer is expected to remediate what an audit finds. Complaints go first to the installer or the company that guaranteed the work, and GOV.UK publishes guidance specific to poor quality wall insulation fitted under ECO.