FENSA
The UK's main competent-person scheme for replacement windows and doors. FENSA-approved installers can self-certify that their installations comply with the Building Regulations, and installations come with a certificate you'll need when selling your home.
Verify on the official register →
Based on public register and directory records collected up to 2 Jul 2026. Not an official membership count.
Check a specific trader
Thinking of hiring someone? Confirm their current FENSA status on the official register, then run their name through our Cowboy Checker to see their reviews, credentials and company record in one place.
Where FENSA holders are
- UK
- GB
- London
Trades that hold it
Window / Door Fitter · 236Builder · 52Building Completion Contractor · 35Carpenter / Joiner · 13Building Services Contractor · 8Roofer · 5Property Developer · 3Locksmith · 3Window / Door Fitter · 2
FENSA holders with review evidence
These businesses hold a current FENSA record and have customer reviews we can show — a small slice of all holders, not the register itself.
- Trade Windows Services
- Adam Window Centres of Tuckton
- Haven Installations Limited
- Advanced Glazing Systems Ltd
- Associated Windows
- Coral Windows Bradford Ltd
- Pavilion Glass Co. Ltd
- Tudor Installations
- Transform Home Improvements Limited
- Bespoke Windows Darlington Limited
- Alaskan Windows Ltd
- Merstham Glass Limited
Common questions
What is FENSA?
The UK's main competent-person scheme for replacement windows and doors. FENSA-approved installers can self-certify that their installations comply with the Building Regulations, and installations come with a certificate you'll need when selling your home. (Certification scheme.)
How many tradespeople hold FENSA?
We track 404 tradespeople with a FENSA record, based on register and listing data collected up to 2 Jul 2026. This reflects the public records we have collected, not necessarily the scheme's complete membership.
How do I check whether a specific trader holds FENSA?
Check the official register at https://www.fensa.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 records 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.