When to check
Only when a firm claims it. TrustMark registration is not one of the requirements for the Boiler Upgrade Scheme, so many perfectly good heat pump installers will not mention it. But if a firm puts the TrustMark logo on its website, van, leaflet or quote, or says it is TrustMark registered, the claim is worth checking, because it is one of the claims a homeowner is likely to rely on.
How to check
- Go to TrustMark's own website and use "Find a Business".
- Search for the firm by its trading name.
- Check the trades or services listed against the work you want done.
- Compare the name and address with those on the quote.
Do not rely on a link from the firm's own website; go to TrustMark directly.
If the claim does not check out
TrustMark warns that some tradespeople advertise as TrustMark registered when they are not. It says misuse can be reported to it, and that it refers persistent cases to Trading Standards. Showing a trust mark without authorisation is also one of the practices banned outright under the Digital Markets, Competition and Consumers Act 2024, in force since 6 April 2025.
There can be innocent explanations, such as a lapsed registration or a firm trading under a different name. Ask the firm. But a claim that cannot be confirmed is a reason to be careful with the rest of what the firm tells you.
What TrustMark does not replace
- MCS certification for heat pumps. Needed for the grant and for an MCS certificate. Check it on the MCS register.
- A consumer code. Ofgem lists HIES, RECC and MCS for the grant. Check membership on the code's site.
- The written design and terms. No register replaces a proper heat-loss design and clear written terms.
The check sheet treats TrustMark as check six of ten: confirm it if claimed, otherwise tick it and move on.
A note on logos in general
The same caution applies to any badge or logo: consumer codes, manufacturer schemes and trade bodies. A logo tells you what a firm says about itself. The organisation's own register tells you whether that is true. This site, for its part, shows no badges or logos of its own and holds no memberships, because it installs nothing.
TrustMark and the grant
TrustMark registration is not one of the Boiler Upgrade Scheme's requirements. The scheme asks for MCS certification and membership of a consumer code; Ofgem lists HIES, RECC and MCS. So a firm without TrustMark can be fully eligible to apply for the grant, and a firm with TrustMark still needs the MCS and code checks.
If a firm has left TrustMark
Registrations can lapse or end. If a firm's materials still show the logo but its listing has gone, ask when it left and why. Old leaflets and vans can lag behind, but a current website or quote should not.
Keeping the evidence
If you check a firm's TrustMark listing, note the date and what it showed on your check sheet. If you later need to rely on the firm's TrustMark membership, for example in a complaint, a dated note of what you checked is useful evidence.
Similar names
Trading names can be close. When you search, compare the address or company number on the quote with the TrustMark listing, so that you are checking the firm you are actually dealing with and not one with a similar name.
When several trades are involved
Heat pump jobs often come with other work: insulation, new radiators, electrical upgrades, sometimes a new hot water cylinder. If different firms do different parts, check each one separately. A TrustMark listing covers the trades a business is registered for, so a firm listed for one trade is not, by that listing, registered for another. MCS works the same way, one technology at a time.
Whatever the listing shows, record it alongside the MCS and consumer code checks, so that all three are in one place when you compare firms. A firm that passes the checks the grant requires does not need TrustMark as well; a firm that claims TrustMark should be able to show it.