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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
Manage your FENSA with CertBox
1
Upload the PDF
Upload your FENSA to CertBox against the right property.
2
Track expiry dates
Your dashboard shows when certificates need renewing.
3
Share via link
Send a secure link to landlords, agents, or Building Control.
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.