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.
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.
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.
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)
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.
| PAS 2035 retrofit assessment | Free |
| 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.
Check Your Warm Homes Plan Eligibility — Free
BestBuilders matches you with vetted UK installers approved for the Warm Homes Plan. Check eligibility and compare quotes — no cost, no obligation.
Common Questions
Related Guides
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 →