What grants are available for external wall insulation?

Several UK schemes can pay towards external wall insulation, but they target different households. Here is the landscape and where to check.

The two main GB-wide schemes

Two government-backed schemes dominate insulation funding in Great Britain, both administered through obligated energy suppliers and regulated by Ofgem:

• ECO4 (Energy Company Obligation): a whole-house, fabric-first scheme for low-income and vulnerable households. It can fund solid wall (external) insulation as part of a package designed to lift a property up the EPC bands.
• Great British Insulation Scheme (GBIS): funds single measures and reaches a wider set of households through a General Group based on a lower EPC rating and lower council tax band, alongside a Low Income Group.

Eligibility for both is checked through gov.uk or directly with energy suppliers and approved installers.

Indicative scheme structure, 2026. Confirm current rules on gov.uk or Ofgem, as schemes are reviewed periodically.

Devolved and local schemes

Scotland and Wales run their own energy-efficiency programmes that can fund wall insulation. Warmer Homes Scotland and Home Energy Scotland support eligible Scottish households, while in Wales the Nest / Warm Homes programme does similar. Some local councils also run their own grant schemes, sometimes funded through national pots such as the Home Upgrade Grant or social housing decarbonisation funding for eligible properties. Because these vary by area and change over time, the reliable route is to start at the official national advice service for your nation rather than assume a specific scheme is open.

What the grants will and won't cover

Grant funding can cover much or all of the cost of external wall insulation for eligible households, but with conditions. The work must be installed to the PAS 2030/2035 standards by a TrustMark-registered installer, usually with a retrofit assessment first to confirm the measure is appropriate. Under ECO4's fabric-first approach, solid wall insulation is typically funded as part of a wider package rather than in isolation. Under GBIS it can be a standalone measure. The amount funded depends on the scheme, the household's circumstances and the property's existing efficiency.

For households that do not qualify for any grant, the fallback is still favourable: privately paid EWI in Great Britain attracts 0% VAT on installed energy-saving materials under the relief running to 31 March 2027, reducing the cost compared with standard-rated building work. The right approach is to check eligibility through official channels first, then plan privately if no grant applies.

How to check what you qualify for

The factual route to finding grant support is to use the official services rather than third-party lead sites. In England and Wales, the gov.uk 'check eligibility' pages for ECO4 and the Great British Insulation Scheme are the starting point, and Ofgem publishes the scheme rules. In Scotland, Home Energy Scotland is the advice service. Your energy supplier can also tell you whether they deliver ECO or GBIS measures and how to apply.

Eligibility generally turns on a mix of household income or qualifying benefits, the property's EPC rating, and — for the GBIS General Group — the council tax band. Because the schemes are periodically reviewed and budgets are finite, it is worth checking the current position before assuming a grant is available. None of this involves sales steps: you check eligibility, an approved installer surveys the home, and the work proceeds under the scheme if it qualifies.

It also helps to understand how these schemes change over time, because the names and exact rules have shifted across recent years. Government insulation support has run through successive phases — earlier obligation periods, the now-closed Green Homes Grant, and the current ECO4 and Great British Insulation Scheme — each with its own criteria and budget. The practical implication is that information from a few years ago may be out of date, and a scheme that was open then may have closed or changed. That is why every check should be against the current gov.uk and Ofgem guidance rather than older articles or word-of-mouth. The underlying principle, though, has stayed consistent: support is targeted at less efficient homes and lower-income or vulnerable households, delivered by registered installers to recognised standards, and accessed through official channels rather than unsolicited offers.

Matching the right scheme to your situation

With several routes available, it helps to know which is likely to fit before you start checking. If your household receives a means-tested benefit such as Universal Credit or Pension Credit and your home is solid-walled and inefficient, ECO4 is the natural first check, because it can fund a whole-house package including solid wall insulation. If you are not on benefits but live in a less efficient home in a lower council tax band, the GBIS General Group is the route designed for you, since it qualifies the property rather than your income. If you are on a low income or vulnerable to the cold but not on a listed benefit, your local authority's flexible-eligibility route under ECO4 may apply, so the council is the place to ask.

For Scottish and Welsh residents, the national advice services — Home Energy Scotland and the Nest / Warm Homes programme in Wales — are the single best starting points, because they can direct you across both the UK-wide supplier obligation and their nation's own schemes. Tenants should remember that eligibility often hinges on their circumstances but the work needs the landlord's consent, while social housing residents should raise insulation with their housing provider, who usually arranges it through dedicated funding. Whatever your situation, the dependable sequence is the same: identify the route that matches your household and property, confirm the current rules through gov.uk or Ofgem, and let an approved installer assess the home — and if no grant applies, fall back on privately paid work at 0% VAT while that relief lasts.

Frequently asked questions

Sources & further reading

• GOV.UK — Great British Insulation Scheme
• Ofgem — Energy Company Obligation (ECO)

Figures on this page are typical UK ranges drawn from published sources and depend on your specific property. They are guidance, not a quotation.