Free Home Insulation Grant UK: Loft, Cavity Wall, Solid Wall & Floor Insulation
By Peter Davies, ECO4 Analyst
Reviewed
Short answer: Eligible UK households can get loft, cavity wall, solid wall or floor insulation fully funded through ECO4 or the Warm Homes: Local Grant at no cost to the homeowner. You'll typically qualify if you receive a means-tested benefit, or if your household income is low and your home has an EPC rating of D to G. Savings average £200–£400 a year on heating. Checking takes about a minute.
Funded — no cost
100%
ECO4 closes
31 Dec 2026
Warm Homes: Local Grant runs to
31 Mar 2028
Saved per year
£200–£500
What Is the Free Home Insulation Grant, and Which Schemes Fund It?
"Free home insulation grant" isn't one single scheme — it's shorthand for several UK government-backed programmes that pay energy suppliers or local councils to insulate low-income and energy-inefficient homes. In 2026, two routes are actually funding insulation:
- ECO4 (Energy Company Obligation 4) — the main route for households on qualifying benefits. Large energy suppliers are legally obligated to fund insulation and heating upgrades for eligible customers. ECO4 runs across England, Scotland and Wales and is open until 31 December 2026.
- Warm Homes: Local Grant — delivered through local councils in England, for households who don't receive benefits but are still on a low income (or live in an eligible postcode area). Launched April 2025, it runs until 31 March 2028.
- LA Flex — a council-referral route that sits alongside ECO4. Some councils can refer households who don't receive standard benefits, based on local low-income criteria — so it's worth checking even if you think you don't qualify.
You may see the GBIS (Great British Insulation Scheme) mentioned elsewhere online — this closed to new applications on 31 March 2026 and is no longer accepting new homeowners. If you were relying on GBIS, ECO4 or the Warm Homes: Local Grant are now your live routes.
Free Boiler Upgrade UK is an independent eligibility-check and application-assistance service. We are not the government, an energy supplier, or a local authority — we check which of these schemes you may qualify for, handle the paperwork, and connect you with accredited installers.
Bottom line —Two live routes fund free insulation in 2026 — ECO4 (benefits) and the Warm Homes: Local Grant (low income, England). GBIS is closed. LA Flex is worth checking even if you don't think you qualify.
Who Qualifies for Free Insulation in 2026?
Eligibility depends on which scheme fits your household. Most people qualify through one of three pathways:
| Route | Who it's for | Key criteria | Coverage |
|---|---|---|---|
| ECO4 | Households on qualifying benefits | Universal Credit, Pension Credit, Income Support, income-based JSA/ESA, Housing Benefit, Child Tax Credit (income under £18,500), or Working Tax Credit + EPC rating D–G | England, Scotland, Wales |
| Warm Homes: Local Grant | Low-income households not on benefits | Household income £36,000/year or less, or an eligible postcode area, or a qualifying benefit + EPC rating D–G | England only |
| LA Flex | Households your council identifies as vulnerable to cold | Set by your local authority — often includes health conditions worsened by cold housing, or income just above other thresholds | Varies by council, England/Scotland/Wales |
A few things worth knowing before you check:
- Both homeowners and private tenants can apply — tenants need landlord consent.
- Your home generally needs an EPC rating of D, E, F or G to qualify for any of these routes. You can check your current rating with our EPC Checker.
- You only need to meet the criteria for one pathway, not all of them.
- Social housing and privately rented properties have slightly different rules — a landlord contribution may apply in some cases.
Bottom line —You only need to clear one of the three routes above — not all three — and EPC band D-G is the common thread across every route.
Check If You Qualify
Covers all three routes in one 49-second check.
What the Grant Covers
Loft Insulation
Mineral wool or blown-fibre insulation laid across the loft floor. Up to 25% of a home's heat is lost through an uninsulated roof. Installation typically takes a few hours and can save around £150–£330 a year, depending on how little insulation was there before.
Cavity Wall Insulation
Insulating foam or beads injected into the gap between brick layers. Cavity walls without insulation can account for up to 33% of a home's heat loss. A typical install takes half a day and saves around £250–£295 a year.
Solid Wall Insulation
For older properties (commonly pre-1930s) without a cavity to fill. Insulation is fitted internally or externally. It's a bigger job than cavity wall insulation, but can save up to £400 a year and is prioritised under ECO4 for solid-wall homes.
Floor Insulation
Underfloor or overboard insulation fitted beneath ground floors to stop draughts and cold spots, especially in older homes with suspended timber floors.
All installations under these schemes are carried out by accredited installers following PAS 2035 and registered with TrustMark. Which measures you're offered depends on a home survey — not every property qualifies for every measure.
Bottom line —Loft and cavity wall insulation are the quickest, cheapest measures to fund; solid wall insulation saves the most but is the bigger job. Your survey decides which ones your property is offered.
How Much Could You Save?
Savings depend on your property, your current insulation levels, and which measure you have installed. Based on Energy Saving Trust and Ofgem figures for a typical UK home:
Loft insulation
£150–£330
per year
Cavity wall insulation
£250–£295
per year
Solid wall insulation
£300–£400
per year
Floor insulation
Varies
comfort-led
Beyond the direct bill savings, a properly insulated home also tends to see an improved EPC rating, fewer cold spots and less condensation, and a boost to resale or rental value.
Bottom line —Solid wall insulation saves the most per year but is the biggest job; loft and cavity wall are faster wins if your survey shows they're needed.
How to Apply
Check Eligibility
Use our quick online form — most applicants hear back within 24 hours. You'll need details of any benefits you receive and basic property information.
Home Survey
If you look eligible, an assessor carries out a no-cost survey to confirm which insulation measures suit your property.
Installation
Once approved, your installer carries out the work — loft insulation usually takes a few hours, cavity wall insulation around half a day, and solid wall or floor insulation longer, depending on the job.
Apply in good time. ECO4 closes 31 December 2026, and funding under both ECO4 and the Warm Homes: Local Grant is allocated on a first-come, first-served basis by installer and council capacity — it doesn't run out overnight, but slots do tighten as deadlines approach.
Bottom line —Three steps, most applicants hear back within 24 hours of checking — but don't leave it to the last few months before the December 2026 deadline.
What If You Don't Qualify?
Not everyone will meet the criteria for ECO4 or the Warm Homes: Local Grant straight away — and that's worth knowing upfront rather than finding out after applying.
- If you're just above the Warm Homes: Local Grant income threshold, ask your council about LA Flex; many areas set their own, broader criteria.
- If you're outside England, the Warm Homes: Local Grant doesn't apply to you — Scotland, Wales and Northern Ireland run separate national schemes, and ECO4 still covers Scotland and Wales.
- If your EPC rating is already C or above, insulation grants generally won't apply, though other schemes (like the Boiler Upgrade Scheme for heat pumps) may still be relevant.
- You can also pay for insulation privately — cavity wall and loft insulation are relatively low-cost compared with solid wall work, and 0% VAT applies to insulation materials and installation UK-wide.
We'll tell you plainly if you don't look eligible — we'd rather save you time than push you through a survey you won't qualify for.
Bottom line —Just missed the threshold? Ask about LA Flex before assuming you're excluded — council criteria are often broader than the headline figures.
Key Benefits & Savings
"According to the Energy Saving Trust, a typical UK home with poor insulation can lose over half its heat through an uninsulated roof and walls combined."
What Do ECO4, Warm Homes: Local Grant, and LA Flex Actually Mean?
- ECO4
- The fourth and current phase of the Energy Company Obligation, running until 31 December 2026, requiring large energy suppliers to fund energy-efficiency improvements — including insulation — in low-income and fuel-poor households.
- Warm Homes: Local Grant
- A council-delivered scheme for England, launched April 2025 and running to 31 March 2028, open to low-income households (income £36,000 or less) who don't receive means-tested benefits.
- LA Flex
- Local Authority Flexible Eligibility — the route that lets a council refer households who don't receive a qualifying benefit, based on local low-income or vulnerability criteria set out in its own Statement of Intent.
- EPC
- Energy Performance Certificate — a government-issued rating from A to G of a property's energy efficiency, valid for 10 years. These insulation routes require band D-G.
- GBIS
- The Great British Insulation Scheme — a separate insulation grant that closed to new applications on 31 March 2026. No longer live; ECO4 and the Warm Homes: Local Grant are the current routes.
- PAS 2035
- The government's technical standard for whole-house retrofit insulation work, which every accredited installer on these schemes must follow.
Frequently Asked Questions
Is the Great British Insulation Scheme (GBIS) still available in 2026?
No. GBIS closed to new applications on 31 March 2026. If you didn't apply before then, you can no longer use it — but you may still qualify for free insulation through ECO4 (if you receive a qualifying benefit) or the Warm Homes: Local Grant (if you're in England on a low income).
Which insulation types are available through the free grant?
Loft, cavity wall, solid wall and floor insulation are all covered, depending on your property type and what a home survey recommends. Most homes qualify for at least one measure.
How much can I save with free home insulation?
Typical savings range from around £150/year for a loft top-up to £400/year for solid wall insulation, based on Energy Saving Trust figures for a standard UK home.
Do I need to be on benefits to qualify for free insulation?
Not necessarily. ECO4 requires a qualifying benefit, but the Warm Homes: Local Grant (England) is open to low-income households with no benefits, based on income or postcode.
What is the Warm Homes: Local Grant and how is it different from ECO4?
It's a council-delivered scheme for England-based, low-income households who don't receive means-tested benefits. Unlike ECO4, eligibility is based on household income (£36,000 or less) or living in an eligible postcode area.
Can I get free insulation if I rent my home?
Yes, private tenants can apply with landlord consent. Some measures may require a landlord contribution under certain scheme rules.
How long does insulation installation take?
Loft insulation usually takes a few hours. Cavity wall insulation typically takes half a day. Solid wall and floor insulation take longer, depending on the size and condition of the property.
Will insulation improve my home's EPC rating?
In most cases, yes. Reducing heat loss through the roof, walls or floor is one of the more effective ways to raise an EPC rating from D–G toward C or better.
What happens if I don't qualify for ECO4 or the Warm Homes: Local Grant?
Ask your council about LA Flex, which often has broader local criteria. If you're outside England, check your country's separate national scheme. You can also insulate privately at 0% VAT.
What's the application process for the free insulation grant?
Check eligibility online, complete a no-cost home survey if you look eligible, then book installation once approved. Most applicants hear back within 24 hours of applying.
Questions answered — ready to check?
49-second eligibility check. No obligation.
Sources & references
Important: we are not GOV.UK — read full disclaimer
Free Boiler Upgrade UK (freeboilerupgrade.uk) is a private eligibility-check and application-assistance service. We are not a government department, not Ofgem, and not GOV.UK. ECO4 funding is delivered through obligated energy suppliers and their supply chains; the Warm Homes: Local Grant is delivered through local councils. Eligibility, timescales and which insulation measures are appropriate for your home depend on live scheme rules, evidence, a technical survey, and available funding. Figures for savings are illustrative ranges based on Energy Saving Trust and Ofgem data, not guarantees.
gov.uk — Energy Company Obligation (ECO4)
Scheme overview, closing 31 December 2026
Ofgem — ECO4 Delivery Guidance v4.0
Final-phase delivery rules
gov.uk — Warm Homes: Local Grant guidance
£36k income / eligible postcode / benefit routes, EPC D-G
gov.uk — Great British Insulation Scheme (GBIS)
Closed to new applications 31 March 2026
gov.uk — Find an energy certificate (EPC register)
Free EPC lookup, 2-minute check
Energy Saving Trust — home insulation savings estimates
Loft, cavity wall and solid wall savings figures
TrustMark — government-endorsed quality scheme
Installer accreditation standard
Published: . Last updated: . Author: Peter Davies, ECO4 Analyst.
Revision history
- — Full content rebuild from the approved editorial brief. Replaced the outdated GBIS-only framing and the incorrect "March 2026" ECO4 funding-window figure with the current ECO4 (31 Dec 2026) / Warm Homes: Local Grant (31 Mar 2028) / LA Flex three-route structure. Added the eligibility comparison table, a "what if you don't qualify" section, glossary, key-stats tiles, bottom-line callouts, sources list, author bio and full JSON-LD schema set. Restyled onto the shared service-page section kit to match /eco4-eligibility and /grants/cavity-wall-insulation.
- — Restyled onto the shared section-kit layout (no content changes).
- — Page first published.
Related Guides
How ECO4 Keeps Your Home Warm
Save energy without sacrificing comfort
Read guideCondensation & Damp Solutions
How insulation fixes damp and condensation
Read guideFree Cavity Wall Insulation
A deeper look at eligibility, survey and costs
Read guideECO4 Eligibility 2026
Full benefits list and the LA Flex no-benefits route
Read guideWarm Homes Plan
The Warm Homes: Local Grant and what replaces ECO4
Read guideFree Home Insulation Grant: Summary
Free Boiler Upgrade UK is an independent eligibility-check and application-assistance service covering the full menu of UK home insulation measures — loft, cavity wall, solid wall and floor — nationwide, connecting eligible households with PAS 2035-accredited, TrustMark-registered installers at no cost to the homeowner.
Two live routes fund insulation in 2026: ECO4, for households on a qualifying means-tested benefit, running across England, Scotland and Wales until 31 December 2026; and the Warm Homes: Local Grant, an England-only, council-delivered route for households on income of £36,000 a year or less (or in an eligible postcode), running to 31 March 2028. A council's LA Flex route can extend eligibility further on local low-income or vulnerability grounds. The Great British Insulation Scheme (GBIS) closed to new applications on 31 March 2026 and is no longer an option.
Most homes need an EPC rating of D–G to qualify, and only need to clear one of the three routes above, not all three. A free home survey then decides which measure — or measures — actually fits the property.
Typical savings range from £150–£330 a year for loft insulation up to £300–£400 a year for solid wall insulation, with cavity wall insulation in between at roughly £250–£295 a year, based on Energy Saving Trust and Ofgem figures. Most applicants hear back on eligibility within 24 hours — but final savings and whether a measure is offered at all still depend on the home survey, subject to eligibility and available funding.
Apply For Your Free Insulation Grant Today
Complete the form below to check your eligibility for the Free Home Insulation Grant UK — covering ECO4, the Warm Homes: Local Grant and LA Flex. Most applicants hear back within 24 hours.
Ready to Reduce Your Energy Bills?
Join thousands of UK households benefiting from free insulation grants. Check your eligibility today.