What Is FENSA and Why Does It Matter?
FENSA is a government-authorised competent person scheme that monitors Building Regulations compliance for replacement windows and doors in England and Wales.
Every FENSA Approved Installer — from large national brands to small local companies — is assessed regularly by FENSA to ensure its standards are continually maintained.
Work Monitored by FENSA
FENSA monitors the replacement of the following items for compliance with relevant Building Regulations in residential properties in England and Wales*:
- External windows
- External doors**
- Roof windows
- Roof lights
Provided they are cited on their original footprint in a heated area, where the use or size of rooms has not been altered. Cut-out & fill-in scenarios are also acceptable as long as you have not made the aperture any wider.
**It is only mandatory for FENSA Approved Installers to register an external door installation with FENSA if the door contains over 50% glass. However, if you would like a FENSA certificate for an installation of external doors that contain less than 50% glass, simply ask your FENSA Approved Installer to register the work with FENSA.
Work Not Monitored by FENS
FENSA does not monitor the following types of installation work:
- New conservatories
- New porches or existing porches where there is no heating
- Loft conversions
- Property conversions (e.g. a house being split into multiple flats)
- New builds
- New extensions
- Repairs (where the frame is not included)
- Commercial properties
What to Expect from a FENSA Approved Installer
A FENSA Approved Installer will:
- Ensure your installation complies with Building Regulations
- Register the work with your local council (a legal requirement)
- Ensure the work meets energy efficiency standards
- Provide you with a FENSA certificate once the job is complete
This certificate is essential when it comes to selling your home, as it proves compliance and professional installation.