TrustMark
The UK government-endorsed quality scheme for work in and around the home. TrustMark-registered businesses are vetted for technical competence, customer service and trading practices.
Verify on the official register →
Based on public register entries and source listings collected up to 17 Jul 2026. Not an official membership count.
Check a specific trader
Thinking of hiring someone? Confirm their current TrustMark status on the official register, then run their name through our Cowboy Checker to see their reviews, credentials and company details in one place.
Where TrustMark holders are
- London
- Leeds
- Manchester
- Bristol
- Colchester
- Southampton
- Enfield
- Essex
- Surrey
Trades that hold it
Builder · 378Electrician · 377Building Services Contractor · 288Surveyor · 267Window / Door Fitter · 100Roofer · 94Bricklayer / Mason · 78Building Completion Contractor · 43Plumber · 38
TrustMark holders with review evidence
These businesses hold a current TrustMark entry and have customer reviews we can show. This is a small slice of all holders, not the register itself.
Common questions
What is TrustMark?
The UK government-endorsed quality scheme for work in and around the home. TrustMark-registered businesses are vetted for technical competence, customer service and trading practices. (Certification scheme.)
How many traders hold TrustMark?
We track 4,127 traders with a TrustMark entry, based on register and listing data collected up to 17 Jul 2026. This reflects the public entries we have collected, not necessarily the scheme's complete membership.
How do I check whether a specific trader holds TrustMark?
Check the official register at https://www.trustmark.org.uk/, or look the trader up on MyTrustedTraders. Profiles show the credentials we have found for them, alongside reviews and other public evidence.
Keep checking
All certificationsCowboy CheckerCompany Health CheckCredential Guide by trade
We show what the public sources say, with dates. A listing here is not an endorsement, and absence from our data does not mean a trader is unregistered. Always confirm current status with the scheme before you hire.