Most Warm Homes Plan funding needs a certified installer. Checking accreditation is also your best protection against poor work.
Last reviewed 3 November 2026 · Independent guide, not affiliated with the UK Government
Which accreditation you need
| Work | Look for |
|---|---|
| Heat pumps, solar, batteries | MCS certification. Required for the Boiler Upgrade Scheme and Warm Homes loans |
| Insulation and fabric work | TrustMark registration |
| Heat network connections | Any installer can be used for the loan |
Where to search
Questions to ask
- Will you apply for the grant, and is it shown on the quote?
- Which lenders do you work with?
- What does the price include, and what warranty comes with it?
- Can I see your certification number?
We don’t recommend or rank installers, and we don’t take referral fees.
Latest on installs
- Off oil or LPG? The £9,000 heat pump grant runs until 31 March 2027
- Budget cuts £1bn from Warm Homes Plan grants: what it means for you
- Warm Homes Loan Scheme launches with 10 lenders
Not sure what applies to you?
Answer up to seven questions and we’ll show the grants and loans you may qualify for, with the official contact for each.