FENSA-Certified InstallationReplacement Windows & Doors,Self-Certified in South West London

FENSA is a government-authorised competent person scheme for replacement window and door installation. A registered installer can self-certify that qualifying work complies with the relevant Building Regulations, instead of the homeowner submitting a separate building control application.

The practical output is a certificate confirming the installation was carried out by a registered installer and complies. That is the document a conveyancing solicitor asks to see.

Thermal performance is the requirement people know about, but it is not the only one. Safety glazing is required in critical locations such as door leaves, side panels and low-level glazing. Ventilation provision has to be maintained or improved, which is why trickle ventilation is specified.

Means of escape matters in habitable rooms: where an escape window is required, the replacement has to provide a clear opening that satisfies it. That constrains where opening lights and mullions can sit, which is why it is decided at survey.

Certification applies to replacement windows and doors in existing dwellings. New openings, extensions and structural alterations are building control matters in their own right and are handled through the building control route for the wider works.

Conservatories, some porches and certain non-domestic situations have their own rules. We tell you at survey which route applies to your specific work rather than assuming.

During conveyancing, buyers' solicitors routinely ask for evidence of compliance for replacement glazing installed since the regulations applied. Missing evidence typically leads to a retrospective regularisation application or an indemnity policy, and to delay while it is arranged.

Keeping the certificate with the property's documents alongside electrical and boiler paperwork avoids that entirely. Landlords benefit for the same reason at portfolio sale or refinance.

Because we manufacture and install, compliance is handled as one thread: the survey establishes what is required, the factory builds to it, our fitters install to it, and the work is certified at completion.

Where a specification decision conflicts with a regulation, a desired glazing bar layout that would compromise an escape opening, for example, we raise it at survey and offer an alternative rather than building something that cannot be certified.

Keep the certificate somewhere you will find it. Homeowners across Wimbledon, Richmond, Putney, Kingston upon Thames, Wandsworth, Clapham, Battersea, Balham and Twickenham most often ask us for a copy years later, at the point a sale is already agreed and a solicitor is waiting on the answer. Filing it with the property's other compliance paperwork at handover removes that phone call entirely.