PAS 2035 is the UK standard for retrofitting homes. Instead of buying measures one at a time, it plans the whole house so upgrades work together and don't cause problems such as damp. Two professionals sit at its centre.
| Retrofit Assessor | Retrofit Coordinator | |
|---|---|---|
| What they do | Survey the home: energy assessment, condition, how it's used | Run the project: plan, risk, installers, sign-off |
| Qualification | Level 3 or 4 retrofit assessment award | Level 5 Diploma in Retrofit Coordination |
| Registration | TrustMark, via an approved scheme | TrustMark, via an accredited scheme |
| Typical cost | About £550–£900 for a full assessment | From about £2,500 + VAT |
When it's required
PAS 2035, with TrustMark-registered installers, is mandatory for grant-funded work, including Warm Homes: Local Grant. Privately funded work doesn't legally have to follow it, but it's the best way to avoid costly mistakes, and it gives you an evidence trail for the cost cap.
Independence matters
A coordinator works for you, not the installer. One business can carry out several roles, but any conflict of interest must be declared to you. Ask who pays them, and whether they earn commission from installers.
What you get at the end
- A medium-term improvement plan, with measures in the right order.
- Installation by TrustMark-registered businesses, with financial protection on the work.
- Coordinator sign-off and a new EPC: your evidence of compliance.
Sources
- TrustMark: Retrofit Coordinator scheme requirements
- DESNZ: Warm Homes: Local Grant policy guidance (June 2026)
- Checkatrade: Retrofit assessor cost 2026 (indicative prices)
Guidance only, not legal or financial advice.
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