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FENSA Certificate

A FENSA Certificate confirms that replacement windows, doors, or roof windows have been installed by a FENSA-registered installer in compliance with Building Regulations. FENSA is a Competent Person Scheme that self-certifies the installation, removing the need for a separate Building Control inspection.

Building Regulations Part L (thermal), Part N (safety glazing), Part K (protection from falling)Valid: Permanent (retained for property records)

What it covers

Window/door specification and U-values
Thermal compliance with Part L
Safety glazing compliance
Ventilation requirements met
Self-certification to Building Control

Who needs a FENSA?

Homeowners

Property buyers/sellers

Conveyancing solicitors

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Frequently asked questions about FENSA

Do I need a FENSA certificate when selling my house?

If windows were replaced after April 2002, the buyer's solicitor will ask for FENSA certificates (or Building Control sign-off). Without them, you may need an indemnity insurance policy, which costs £60-£100.

What if my installer wasn't FENSA registered?

You should have applied to Building Control for approval before the work started. If you didn't, you can apply for a regularisation certificate (retrospective approval) from your local authority, though it costs more.

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