# 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.

- Type: Certification scheme
- Traders with a FENSA entry in the public data we track: 435
- Data collected up to: 11 Jul 2026
- Official register: https://www.fensa.org.uk/
- Page: https://mytrustedtraders.com/certifications/fensa

Counts reflect collected public entries, not official membership totals. Absence from this data does not mean a trader is unregistered.

## Where holders are

- London: 31
- Maulden Bedfordshire: 18
- Benfleet Essex: 16
- Enfield: 10
- Sutton: 10
- Gravesend Kent: 9
- Brentwood Essex: 9
- Cambridge Cambridgeshire: 9
- St. Albans Hertfordshire: 9

## Trades that hold it

- Window / door fitter: 254
- Builder: 55
- building completion contractor: 35
- Carpenter / joiner: 17
- building services contractor: 8
- Roofer: 6
- property developer: 3
- Locksmith: 3

## FENSA holders with review evidence

A slice of holders that also have customer reviews on MyTrustedTraders. This is not the register itself.

- **Adam Window Centres of Tuckton**: window company · Bournemouth · 1,437 reviews. https://mytrustedtraders.com/traders/adam-window-centres-of-tuckton
- **Haven Installations Limited**: window company · Eastbourne, Brighton · 981 reviews. https://mytrustedtraders.com/traders/haven-installations-limited-2
- **All Window Services Ltd**: window company · Erith, Dartford · 919 reviews. https://mytrustedtraders.com/traders/all-window-services-ltd-2
- **The Dewgard Window Co Ltd**: window company · Egham, Twickenham · 888 reviews. https://mytrustedtraders.com/traders/dewgard-window-co-limitedthe
- **Alphaglaze (Croydon) Ltd**: window company · Croydon · 872 reviews. https://mytrustedtraders.com/traders/alphaglaze-croydon-ltd
- **Advanced Glazing Systems Ltd**: window company · Cambridge Cambridgeshire · 854 reviews. https://mytrustedtraders.com/traders/advanced-glazing-systems-ltd-door-canopies-cambrid
- **Associated Windows**: window company · Bristol · 823 reviews. https://mytrustedtraders.com/traders/associated-windows
- **Coral Windows Bradford Ltd**: window company · Bradford · 814 reviews. https://mytrustedtraders.com/traders/coral-windows-bradford-ltd
- **Pavilion Glass Co. Ltd**: window company · Pulborough · 778 reviews. https://mytrustedtraders.com/traders/pavilion-glass-co-ltd
- **Boyland Windows Ltd**: window company · Christchurch, Bournemouth · 754 reviews. https://mytrustedtraders.com/traders/boyland-windows-ltd-2
- **Tudor Installations**: window company · Waterlooville, Portsmouth · 710 reviews. https://mytrustedtraders.com/traders/tudor-installations
- **Transform Home Improvements Limited**: builder · Christchurch, Bournemouth · 580 reviews. https://mytrustedtraders.com/traders/transform-home-improvements-limited-2

## 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 traders hold FENSA?

We track 435 traders with a FENSA entry, based on register and listing data collected up to 11 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 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.