Do grant installers have to be TrustMark registered?

Yes — funded retrofit must go through TrustMark-registered installers under PAS 2035.

How do I check an installer?

Use the TrustMark register; never pay a cold-caller promising free grants.

Before you commit to any retrofit work, check TrustMark. This guide explains what it is, why it protects you, and how to avoid rogue traders.

Last reviewed: August 2026

The only government-endorsed quality scheme for work in and around the home. It backs consumer protection and a complaints route.

Government-funded measures (ECO4, GBIS, Warm Homes) must be delivered by TrustMark-registered installers and lodged with TrustMark under PAS 2035.

Search the TrustMark register for any installer. If they're not registered, walk away from 'free grant' cold-callers — they're a scam.

Do grant installers have to be TrustMark registered?: Yes — funded retrofit must go through TrustMark-registered installers under PAS 2035.
How do I check an installer?: Use the TrustMark register; never pay a cold-caller promising free grants.