What Is FENSA and Why Does It Matter When Replacing Your Windows?
If you've been getting quotes for new windows or doors, you've probably seen companies mention FENSA approval. But what does it actually mean — and why should it matter to you as a homeowner? Here's everything you need to know.
What Is FENSA?
FENSA stands for Fenestration Self-Assessment Scheme. It was established in 2002 by the Glass and Glazing Federation to allow approved window and door installers to self-certify that their installations comply with UK Building Regulations — without homeowners needing to apply separately for building control approval.
FENSA is accredited by UKAS (the UK's national accreditation body) to BS EN 17065:2012, which means it operates to internationally recognised standards. Only installers who have been independently assessed and approved can carry the FENSA mark, and every approved installer is subject to ongoing surveillance and review to maintain their registration.
Why Does Building Regulations Compliance Matter?
Replacement windows and doors are notifiable building work in the UK. That means they must comply with Building Regulations covering energy efficiency, ventilation and safety. These regulations exist to protect homeowners — ensuring that new windows and doors don't make your home less energy efficient, less safe or less weatherproof than before.
When you use a FENSA approved installer, compliance is handled automatically. Your installer certifies that the work meets Building Regulations on your behalf, and the installation is registered on FENSA's national database. You don't need to do anything, pay anything extra or apply for anything yourself.
Why It Really Matters — Selling Your Home
This is where FENSA approval becomes genuinely important. When you sell a property in the UK, your solicitor must provide evidence that any replacement windows, doors or roof windows installed since April 2002 comply with Building Regulations. There are only two ways to satisfy this requirement: a building control completion certificate, or a FENSA certificate.
If you had your windows installed by a non-FENSA approved company and no building control application was made at the time, you may need to obtain a Local Authority Regularisation Certificate before you can sell. This costs money, takes time and can delay or even jeopardise a sale if not resolved quickly.
Using a FENSA approved installer from the start eliminates this problem entirely. Your FENSA certificate is stored on a national database that solicitors and mortgage lenders can check online at any time.
How to Check If an Installer Is FENSA Approved
You can verify any installer's FENSA registration at fensa.org.uk. Simply search by company name or postcode to confirm their approval status and registration number. If an installer claims to be FENSA approved but doesn't appear on the register, treat that as a red flag.
Elite Group Scotland's FENSA Registration Number is 45056 — you can verify this directly on the FENSA website at any time.
What Our FENSA Approval Covers
Our FENSA approval covers replacement windows, doors, roof windows and rooflights in existing dwellings — which covers the vast majority of domestic installation work. Every installation we carry out comes with a FENSA certificate, registered on the national database and issued to you after completion.
FENSA vs Other Schemes
FENSA isn't the only competent person scheme for window and door installers — CERTASS is another widely recognised alternative. Both achieve the same result: the installer self-certifies Building Regulations compliance on your behalf and registers the work. The key thing is that your installer is registered with one or the other. If they're not, you need to make sure building control approval has been arranged separately before work starts.
The Bottom Line
Always use a FENSA approved window and door installer. It protects you at the point of sale, ensures your installation meets current Building Regulations, and gives you independent verification that the work has been done properly by a certified company.
Elite Group Scotland are FENSA approved installers covering Falkirk, Stirling, Edinburgh, Livingston, Dunfermline, Alloa and all of central Scotland. Get in touch for a free, no-obligation quote — fully compliant, fully certified, 10-year guarantee as standard.