12 checks on every installer — before you ever speak to them
No rogue traders. No shell companies. Every installer is phone-verified against 5+ recent customer references before they join — and re-checked annually.
The 12-point Findfitter verification
FENSA / Certass / Trustmark registration
Active membership verified on the relevant public database. The UK’s required certifications for replacement window installers.
Companies House registration
Minimum 2 years trading under the same company name. No brand-new shell companies.
Director history check
Directors cross-referenced against struck-off company databases. We filter out repeat liquidators.
Public liability insurance
Minimum £5 million cover, current policy verified with the insurer.
Insurance-backed warranty
10-year workmanship + product warranty, backed by a scheme that honours it even if the installer goes out of business.
Verified reviews
Minimum 20 reviews across Google, Trustpilot, or FENSA’s own feedback system, with 4.0+ star average.
Physical business address
Verified via Companies House and Google Maps. No mobile-phone-only operations.
UK landline number
Fixed-line number tied to the business address. We don’t list mobile-only installers.
VAT registration check
VAT-registered status signals scale and legitimacy. Unregistered trades must have a clear business reason.
Payment method verified
Installer accepts card, bank transfer, or finance — never cash-only. Protects your payment rights.
Building regulations process
Documented workflow for local council notification + FENSA certificate issuance.
Quarterly re-verification
Every installer is re-checked every 90 days. Credentials can’t lapse without us knowing.
Sources & references
This article draws on data and guidance from the following authoritative UK sources:
- FENSA database — public verification of installer registration
- Certass database — alternative certification lookup
- Trustmark — government-endorsed quality scheme
- Glass and Glazing Federation — UK trade body standards
- Companies House — company registration, director history, filed accounts
Quote any home improvement
"Straightforward and no pressure. Picked the FENSA-registered installer with the 10-year warranty."
"Was worried about pushy salespeople. Found a FENSA fitter 3 miles away who was honest about pricing."
"Saved £3,700 vs the chain quote. Same spec, same warranty. Easy."