FENSA is one of two Competent Person Schemes that let installers self-certify replacement windows for Building Regulations. Here's what that means for you.
FENSA (Fenestration Self-Assessment Scheme) authorises glazing installers to self-certify that their work complies with Building Regulations, avoiding the need for a separate Local Authority Building Control inspection. When you replace windows or doors, your installer notifies FENSA, and FENSA notifies your local council on your behalf.
After completion, FENSA sends the homeowner a Certificate of Compliance. It's a legal document proving the installation meets Building Regs at the time of fitting. When you sell the house, your solicitor will ask for it — buyers' solicitors treat missing FENSA certificates as an issue.
A FENSA-registered installer has been vetted for insurance, technical competence and financial standing. FENSA also provides an insurance-backed guarantee — if the installer goes out of business, the guarantee remains valid. That's real protection on a £5,000–£15,000 investment.
FENSA covers replacement work in existing openings. Brand-new openings, complete conservatories, and structural changes still need Local Authority Building Control approval. A FENSA installer will tell you when your project falls outside their remit.
Certass is the other main Competent Person Scheme. Both are equivalent in status — installers register with one or the other, not both. Either scheme gives you the same legal protection and buyer confidence. Avoid installers who are members of neither — they cannot self-certify and the paperwork burden falls on you.
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