FENSA registration
Plain English. Practical detail. UK context.
FENSA registration refers to participation in a competent-person scheme for eligible replacement glazing work. It provides a route for registered installers to self-certify specified work against relevant Building Regulations requirements. It is not planning permission, a universal glazing licence or proof that every service offered by a business falls within the scheme.
Last reviewed: (editorial review against the public sources listed below).
Check the actual work is eligible
FENSA's homeowner guidance describes coverage for relevant replacement external windows, doors, roof windows and rooflights in existing homes within its stated conditions. It excludes work such as new builds and new extensions, along with other specified categories. Read the current scope rather than assume every item with glass qualifies. Homeowners should ask which route applies before signing. Trainees should distinguish a complete replacement from a repair and identify when the proposal changes the opening or use. The firm's general registration does not automatically settle the notification route for an ineligible job.
Registration and the specific installation differ
Check the actual business and relevant status through the official scheme rather than rely on a logo copied onto an advert. Agree that eligible completed work will be registered and what certificate follows. A registration number alone is not the homeowner's project certificate. The installer must still select and fit suitable products and address the applicable performance requirements. Trainees should understand survey, installation, records and notification responsibilities rather than regard paperwork as unrelated office work. A certificate should identify the actual completed work, not merely repeat a company's membership claim.
Different documents answer different questions
The building-compliance certificate, installer workmanship guarantee and any insurance-backed protection are distinct. FENSA's guidance explains that an insurance-backed guarantee policy is separate from its certificate and should be checked for actual terms. Planning or listed-building consent may remain separate where relevant. Other competent-person schemes or building-control routes can be available; FENSA is not the only possible lawful route. GOV.UK explains the wider approval framework. Homeowners should not accept the statement that absence of a particular brand certificate always proves an installation unlawful without checking the appropriate alternative evidence.
A clear quotation and property file
Agree product, survey, installation, making good, eligible registration and handover records. Clarify any excluded work and the route for it. Prices and outcomes vary from job to job, so compare written, itemised quotations rather than relying on a typical figure. Tradespeople should retain relevant records and explain who handles an unresolved compliance concern. Homeowners should keep certificates and separate guarantee documents for future questions or sale. A useful handover distinguishes technical compliance from contractual remedy instead of suggesting one piece of paper guarantees every product or financial outcome.
Frequently asked questions
Is FENSA the only compliance route?
No. Other appropriate schemes or building-control routes may apply to the actual work.
Does membership cover a new extension automatically?
No. Check the current scheme scope; FENSA’s stated replacement scheme excludes new-extension work.
Sources and further reading
Public sources and further reading. Sources checked: 8 November 2026. Consult the original for details and later changes.