Home Insulation Grants in Wales

Which insulation grants are open in Wales right now

If you live in Wales, there are two live routes to help with the cost of insulating your home, plus a VAT saving that applies even if you fund the work yourself. The two grant routes are Warm Homes Nest, the Welsh Government's own fuel-poverty scheme, and ECO4, the Great Britain-wide obligation on large energy suppliers. Both are open as at 14 July 2026.

Before anything else, one honest correction that most of the web gets wrong. The Great British Insulation Scheme (GBIS) closed on 31 March 2026. It has not been extended and there is no successor. If you land on a page offering "GBIS grants" in Wales, it is out of date. There is also no "ECO5" and no wave of "new free grants from April 2026" — those are inventions. What genuinely exists in Wales is Nest, ECO4, and the schemes we set out below.

The English Warm Homes: Local Grant does not operate in Wales, and Scotland's Home Energy Scotland grants do not either. Wales has its own delivery scheme in Nest, which is why it is worth reading a Wales-specific guide rather than a generic "UK" one.

Warm Homes Nest — the Welsh Government scheme

Warm Homes Nest is the Welsh Government's demand-led scheme to tackle fuel poverty. It is delivered as a free, impartial home energy service: you contact Nest, it assesses your home, and — if you qualify — it can arrange fully funded energy-efficiency improvements, which can include insulation and heating measures. Nest is designed for lower-income households living in harder-to-heat homes, so eligibility is tied to a combination of your circumstances and your property.

Nest's exact eligibility rules and any measure caps change from time to time, and we will not quote specific figures here that we cannot stand behind. Check the current criteria at nest.gov.wales before you rely on them. As a general guide, Nest looks at whether someone in the household receives a means-tested benefit or has a low income, and whether the home is energy-inefficient and expensive to heat. Even if you are turned down for funded works, Nest still gives free, tailored advice, so it is worth the call regardless.

To apply, contact Nest directly through the Welsh Government's Nest / Warm Homes programme page, which links through to the live service and its freephone number. As an independent guide, we do not take Nest applications and we are not part of the scheme — applying is always free and always goes through official channels.

ECO4 in Wales — funded through energy suppliers

ECO4 (the fourth phase of the Energy Company Obligation) also covers Wales, because it applies across Great Britain — England, Scotland and Wales, but not Northern Ireland. It was recently extended by nine months and now runs to 31 December 2026. There is no ECO5 to follow it. ECO4 is a "fabric first", whole-house scheme: rather than fitting a single measure in isolation, it aims to bring a home up to a better standard, which for many properties starts with insulation.

You do not apply to Ofgem for ECO4. Instead you go through an obligated energy supplier or an accredited installer working under the scheme, or via your local council's ECO4 Flex (LA Flex) route. Because suppliers are working towards a fixed target and a fixed end date, some may stop taking new referrals before December 2026 — so if ECO4 looks like your route, do not leave it to the last minute.

Who qualifies for ECO4

ECO4 is aimed at low-income and vulnerable households. You are likely to be in scope if someone in the home receives one of these means-tested benefits:

• Universal Credit
• Pension Guarantee Credit or Pension Savings Credit
• Income Support
• Income-based Jobseeker's Allowance (JSA)
• Income-related Employment and Support Allowance (ESA)
• Child Benefit (within income thresholds)
• Housing Benefit
• Working Tax Credit or Child Tax Credit

Tenure and EPC rules apply too: owner-occupiers generally need an EPC of D to G, while private and social tenants need an EPC of E to G. Private tenants must have the owner's permission for works to go ahead — see our page on insulation grants for private tenants. If no one in the home claims a qualifying benefit, the ECO4 Flex route lets your council refer lower-income households under its published Statement of Intent, so it is still worth asking. Our guide to grants if you are not on benefits covers this in more detail, and you can read a fuller ECO4 explainer as well.

How Nest and ECO4 compare

The two open schemes are not mutually exclusive in spirit — both target similar households — but you generally pursue whichever channel gets you assessed and funded fastest. Contacting Nest first is usually the simplest starting point in Wales, because it is your national scheme and will also advise you on ECO4 if that fits your home better. For a wider view of every UK route, see our grants and funding hub, and if you want to know how ECO4 and the now-closed GBIS differed, our ECO4 vs GBIS comparison explains it.

What insulation can be funded — and what it usually costs

The measures grants typically pay for are the same across Wales as elsewhere in Great Britain; what varies is the funding route. The unsubsidised costs below come from the Energy Saving Trust and give you a sense of where a grant matters most.

If you live in a park home, its non-standard construction is a genuine niche — funding exists but the assessment differs, so flag it early. For a broader breakdown of what work costs before any grant, see our cost of insulation guide.

Is it really free — and the honesty check

We do not promise "free". For most eligible households, insulation under Nest or ECO4 is fully funded — but a contribution may be requested for high-cost measures, especially solid wall insulation, where an ECO4 top-up model can leave a shortfall. That is normal and not a scam; what matters is that it is set out clearly in writing before you agree. Our page on whether insulation grants are really free unpacks this honestly.

Nearly every insulation grant is gated on a poor EPC — usually band D to G. So the single most useful first step is to check your EPC rating. If your home already scores well, you may not qualify, and if it scores badly, you have a strong case. You can test your likely eligibility with our interactive eligibility checker before you contact any scheme.

There is also a saving available to homeowners who do not qualify for a grant at all. In Great Britain, installing qualifying insulation has been at 0% VAT under the Energy-Saving Materials relief — a real reduction on an able-to-pay job. Rates and end dates can change, so confirm the current position against HMRC VAT Notice 708/6 rather than treating it as permanent, and note this is general information, not tax advice.

Quality and scams — protect yourself before signing

Grant-funded insulation must be done to recognised standards. Insist that the installer is TrustMark registered and that the work follows PAS 2035 (retrofit) and PAS 2030 (installation). A compliant job begins with a retrofit assessment and a Retrofit Coordinator — not with a salesperson quoting you a single measure over the phone. If an installer skips the assessment and just wants to fit a product, treat that as a red flag.

Two specific warnings. First, spray-foam loft insulation is a known mis-selling trap: it can block mortgage lending and is treated with caution by surveyors, so be wary of anyone cold-calling to push it. Second, the National Audit Office reported in October 2025 that around 98% of external-wall-insulation jobs under ECO4 and GBIS had defects, prompting free TrustMark "Find & Fix" audits — so if you have had grant-funded EWI recently, it is worth checking whether your install needs auditing.

Above all, "free insulation grant" cold calls, doorstep sellers and texts are the classic funnel for poor-quality or fraudulent work. Real schemes in Wales are reached through the Welsh Government's Nest page, your local council, or an accredited installer — never pay upfront and never let work start before you have written grant approval. Our insulation grant scams guide goes through the warning signs in full, and you can verify any installer against TrustMark.

A note on the Warm Homes Plan

You may see references to the UK Government's Warm Homes Plan, a £15bn umbrella programme published on 21 January 2026. It is a funding framework rather than something you apply to directly — it channels money into delivery schemes. In Wales, the practical routes remain Nest and ECO4. We cover the plan only briefly here because it does not change how you apply.

How to apply in Wales — the simple version

1. Check your EPC and try our eligibility checker so you know which route fits.
2. Contact Warm Homes Nest through gov.wales — this is usually the best first call in Wales.
3. If Nest is not the right fit, ask an obligated energy supplier or your council about ECO4 before 31 December 2026.
4. Insist on a TrustMark / PAS 2035 retrofit assessment, and never pay before written approval.

For a step-by-step walkthrough that applies wherever you live, see our how to apply guide. If you would like us to point you toward the right official channel for your circumstances, use our contact form or request a quote comparison — we install nothing and run no grant ourselves; we simply help you reach the real schemes, which are always free to apply to. You can also read our frequently asked questions or browse the blog for the latest updates.