All you need to know and how to check for FENSA

Wondering if your old windows meet UK standards? Let’s find out if they’re FENSA certified. FENSA (Fenestration Self-Assessment Scheme) ensures window and door replacements comply with Building Regulations. If you’re selling your home, upgrading windows, or simply want peace of mind, knowing their status matters. This guide explains what FENSA certification means, why it matters for older windows, and practical steps to check your certification.

What is FENSA Certification?

Overview of FENSA
FENSA is a government-authorised scheme set up in April 2002. It lets registered installers confirm that window and door replacements meet Building Regulations without needing a council inspection.

What It Covers
FENSA ensures window and door replacements meet rules for energy efficiency (U-values), safety glazing, ventilation and thermal performance. Installations must be recorded with the local council.

Why It Matters
Homeowners benefit from:

• Legal compliance – proof that windows meet building standards
• Energy savings – better insulation lowers bills
• Property value – buyers and solicitors often ask for a FENSA certificate
• Warranty – most certificates since June 2014 include insurance-backed guarantees

Learn more directly on the official FENSA website.

Do My Old Windows Need to Be FENSA Certified?

FENSA’s Scope
FENSA applies to window and door replacements in England and Wales from 1 April 2002 onwards. It doesn’t apply to new-builds or certain buildings with listed status or conservation restrictions.

Older Properties
If your windows were installed before 2002, you don’t need FENSA certification. However, it’s useful to have proof of Building Control sign-off, especially if you’re selling or remortgaging.

Why Check
You may need to confirm certification if:

• You’re selling your home
• You’re applying for a mortgage or remortgage
• You’re upgrading for energy efficiency

How to Check if Your Windows Are FENSA Certified

Step 1: Look for Documentation
Check your home files for a FENSA certificate. It should list the installer, installation date, and your address. If you didn’t do the installation, try contacting the previous owners.

Step 2: Inspect the Windows
Some windows have FENSA stickers on the frame or glass. These might be small, so check the corners. Some installers also engrave details into the frame.

Step 3: Contact the Installer
If you know who fitted the windows, ask if they were FENSA-registered and request a certificate or copy.

Step 4: Use FENSA’s Online Database
You can search by postcode or installer on the FENSA certificate search tool. If your windows are certified, you can request a replacement certificate for £25.

Step 5: Consult a Professional
If there’s no paperwork, a FENSA-registered installer or assessor can inspect your windows and let you know if they meet standards.

What If My Windows Aren’t FENSA Certified?

Pre-2002 Installations
Windows installed before April 2002 don’t need FENSA certification. But if you’re selling, Building Control records may be required, especially in conservation areas.

Post-2002 Non-Certified Windows
This may mean the installer wasn’t registered or didn’t notify FENSA. Problems may include:

• Difficulty selling the property
• Lack of proof for compliance
• Possible energy inefficiency

Solutions

• Apply for a replacement certificate if the installer was registered
• Contact your local authority for a Building Regulations Certificate (approx. £300–£400)
• Replace non-compliant windows with FENSA-certified ones

Benefits of FENSA-Certified Windows

• Energy Efficiency: FENSA-certified windows meet required U-values, which helps cut heating costs
• Property Value: Buyers trust certified windows
• Legal Compliance: You avoid fines or legal issues
• Warranty: Many certified installations come with a 5–10 year guarantee backed by insurance

Common Myths About FENSA Certification

Myth 1: All windows need FENSA
Only replacement windows installed after April 2002 require it.

Myth 2: It’s optional
If your replacement was after 2002, certification is legally required unless signed off by local Building Control.

Myth 3: FENSA means high-quality workmanship
FENSA ensures compliance with rules, but it doesn’t guarantee installer skill. Always check reviews and past work.

Tips for Choosing a FENSA-Registered Installer

Why Choose One?
They register each installation, follow Building Regulations, and offer warranty-backed work.

What to Look For

• Listed on the FENSA installer finder – Skyway Windows Certificate
• Verified reviews and customer photos
• Experience with your type of home or windows

Questions to Ask

• Do you provide a FENSA certificate and warranty?
• How long will installation take?
• What U-values or energy ratings do your products meet?

Contact Skyway Windows Ltd a FENSA-registered installer today to check your windows or plan an upgrade. Below is an easy to navigate table of the product offerings that are all FENSA certified.