How-To · Updated May 2026

How to Get a Warm Homes Plan Grant for Insulation in 2026

The UK Warm Homes: Local Grant covers up to £15,000 of insulation works per home in 2026 — typically loft, cavity-wall or external solid-wall insulation, sometimes with a heating upgrade attached. Eligibility is simpler than the legacy ECO4 scheme: household income under £36,000/year or EPC rating D, E, F or G in an eligible council area. This guide walks through the seven application steps, what's funded vs. excluded, the typical timeline (12–20 weeks), and a real £12,400 case study from Sheffield S5.

7-step application 2026 eligibility rules Worked example
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Quick Answer

Who qualifies and how much can you get?

You may qualify if your home meets at least one of:

  • Total household income under £36,000/year
  • EPC rating D, E, F or G
  • Property is in an eligible council area under the Local Grant scheme
  • You receive a qualifying benefit (Universal Credit, Pension Credit, ESA, Income Support, Working Tax Credit)

Typical funded works (and 2026 caps):

  • Loft insulation 270mm — fully funded, average value £550–£950
  • Cavity-wall insulation — fully funded, average £1,200–£1,800
  • External wall insulation (EWI) — up to £12,000
  • Internal wall insulation (IWI) — up to £8,500
  • Underfloor insulation — up to £2,400

Application takes 30–60 minutes online. The full process from application to install completion runs 12–20 weeks in 2026 — longer in winter peak when demand spikes.

The 7-Step Application

How to Apply for a Warm Homes Plan Grant

Step 1 — Check eligibility on GOV.UK

Visit the official Warm Homes: Local Grant page on GOV.UK and use the postcode + income checker. The tool tells you within 30 seconds whether your council is participating and which scheme route applies. Roughly 43% of English postcodes are covered in 2026, expanding monthly. If your postcode isn't yet eligible, you can register for an alert when it joins the rollout.

Step 2 — Get an up-to-date EPC

An EPC less than 10 years old is required. If your existing EPC is older or doesn't exist, book a domestic energy assessor (£45–£110, completed in 1–2 days). Lower ratings (E, F, G) qualify for higher grant caps. If your home rates D and you'd benefit from re-rating after a small upgrade, do the EPC before any work to lock in the grant tier.

Step 3 — Gather supporting documents

You'll be asked for: proof of address (utility bill or council-tax letter dated in the last 3 months), income evidence (latest payslip / SA302 / benefit award letter), proof of property ownership (mortgage statement or Land Registry title), and your EPC certificate number. Renters need a signed landlord consent form (template available on GOV.UK).

Step 4 — Submit application via your council portal

Most councils route the Warm Homes Plan application through a single regional energy agency (e.g. YES Energy Solutions in Yorkshire, Warmworks in Scotland, Nest in Wales). The form takes 30–60 minutes. You'll get an email reference number; keep it. Decisions typically come within 10 working days.

Step 5 — Free in-home retrofit assessment

If your application is approved, a PAS 2035 retrofit assessor visits your home within 2–6 weeks. They survey existing insulation, ventilation, dampness, fabric condition and produce a Whole-House Retrofit Plan. The plan ranks improvements in priority order and confirms which the grant will fund. There's no cost to you.

Step 6 — Choose a TrustMark/PAS 2030 installer

Only TrustMark-registered, PAS 2030 certified installers can deliver Warm Homes Plan works. Most councils provide a panel of 3–5 approved installers per area. You can usually request quotes from 2–3 panel installers and pick on price + reviews. Always check the installer's TrustMark number is current.

Step 7 — Schedule the install + sign the warranty

Loft installs typically take 1 day, cavity-wall 1–2 days, EWI 8–16 working days. On completion, you sign the PAS 2030 install certificate and the installer issues a 25-year independent warranty (e.g. via QANW or IWA). The certificate also auto-triggers an updated EPC, normally lifting your rating by one to three bands.

What's Covered

Funded vs. Excluded Works

✅ Fully or substantially funded

  • Loft insulation (270mm)
  • Cavity-wall insulation
  • Solid-wall insulation (external or internal)
  • Underfloor insulation (suspended timber floors)
  • Park-home insulation
  • Roof insulation between/over rafters
  • Air-source heat pump (where heating-eligible)
  • Solar PV (in some council areas, partial)
  • Smart heating controls + TRVs

❌ Not funded — you pay

  • Window or door replacement (unless damaged by EWI)
  • Internal redecoration after EWI/IWI works
  • Boiler replacement on its own
  • Renovating damp/structural defects (must be fixed first, at cost)
  • Conservatories, garages, outbuildings
  • Listed building consent fees
  • Scaffolding for access works (unless installer-led)
  • Removal of existing failed insulation (often paid by you)
Worked Example

Real Project: 1950s Semi, Sheffield S5

3-bed solid-wall semi-detached, EPC band F, household on Universal Credit. Approved February 2026, installed April 2026.

Brief
External wall insulation (90mm EPS + render), 270mm loft insulation top-up, suspended-floor insulation, smart heating controls. EPC retargeted from F to C. Annual heating bill projection: £2,420 → £1,160.
Grant value
£12,400
homeowner contribution £0
PAS 2035 retrofit assessmentFree
External wall insulation (88m² elevation)£9,800
Loft insulation top-up to 270mm£680
Underfloor insulation (suspended timber)£1,400
Smart heating controls + TRVs (whole house)£520
Total funded by grant£12,400

Outcome: EPC F → C. Estimated annual heating saving £1,260. Property valuation uplift £9,500 (RICS). Comfort improvement noted within the first week of EWI completion.

Frequently Asked

Common Questions

No — they're separate. ECO4 is a supplier-funded obligation that runs through 2026 and ends 31 March 2026 (the successor scheme is ECO5). The Warm Homes Plan is a Treasury-funded grant launched in 2025 with broader eligibility, larger per-household caps, and council-level delivery rather than supplier-led delivery. You can't claim both for the same measure but you can run them sequentially.
Yes — with your landlord's written consent. The standard consent form on GOV.UK is straightforward; landlords typically agree because the works boost their EPC rating (which they need at C+ for new tenancies from 2030) and add resale value at no cost to them. About 21% of 2026 Warm Homes Plan grants have gone to private rented sector tenants.
A clean application gets a decision in 5–10 working days. The retrofit assessment typically lands within 2–6 weeks of approval. Install scheduling depends on installer availability — EWI in particular has long lead times in winter peak (October–February). End-to-end is 12–20 weeks in 2026, but if you apply in March/April for an autumn install, you can shorten that.
No — the grant is not income for tax purposes and doesn't sit as a charge on your property. EWI works will trigger an EPC update and may raise your home's market value, which in some boroughs could reach a council-tax revaluation threshold (rare). Most lenders treat improved EPC bands as a positive for refinancing.
The retrofit assessor will identify these in Step 5 — if they're present, the assessor either pauses the application until you fix them at your own cost, or specifies a partial install excluding the affected wall. Common pre-conditions: rising damp, blocked wall vents, defective flashings, broken render. Budget £400–£2,500 for these prerequisite repairs if flagged.
Sometimes — most councils offer a panel of 3–5 pre-vetted PAS 2030/TrustMark installers and you choose between them. Some councils now allow you to nominate any TrustMark+PAS 2030 installer of your choice (subject to compliance check). If you want a specific installer, check upfront with your council — it's usually fine but adds 1–2 weeks of vetting time.
Yes for fully-funded measures (loft, cavity, smart controls). For EWI/IWI you may have a contribution above the grant cap if the install scope exceeds the maximum (e.g. very large detached property or premium render finish). The retrofit plan tells you up-front if a contribution will apply. About 89% of 2026 Warm Homes Plan installs have been zero-contribution to the homeowner.
Keep Reading

Plan your retrofit project with the full set of BestBuilders grant and insulation guides.

How to apply for ECO4 (2026)

The supplier-funded scheme — still active until 31 March 2026.

Read Guide →

Warm Homes Plan roof grant

Get a free roof refurbishment when an EWI install needs roof line works.

Read Guide →

Warm Homes solar PV discount

When a solar PV array is bundled into your Warm Homes retrofit.

Read Guide →
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