Do I Need a FENSA Certificate for New Windows?

If you’re planning to replace your windows or have new ones installed, you may be wondering, “Do I need a FENSA certificate for new windows?” The short answer is yes—if you want to comply with building regulations and avoid future complications when selling your property.

In this guide, we’ll explain what a FENSA certificate is, when it’s required, why it matters, and how to ensure your installer is properly registered.

What Is a FENSA Certificate?

A FENSA certificate is an official document that confirms your replacement window or door installation complies with UK Building Regulations. FENSA stands for the Fenestration Self-Assessment Scheme, a government-authorised scheme set up to ensure that window and door replacements meet energy efficiency and safety standards.

The certificate applies specifically to replacement installations in residential properties. It’s issued when the work is completed by a FENSA-registered installer and serves as proof that:

• The installation complies with Building Regulations.
• The installer is competent and registered with a recognised authority.
• You don’t need to arrange an independent inspection from local building control.

Do I Need a FENSA Certificate for New Windows?

Yes, if you’re replacing existing windows in your home, you will need a FENSA certificate or an equivalent form of certification. Without it, you may encounter legal or financial problems later on, especially when selling your property.

You do not need a FENSA certificate if:

• You’re installing windows in a new build property (this falls under a different approval process).
• The work is being carried out by a local authority or building control officer, who will inspect and approve the installation.
• You are fitting windows yourself and submit a building notice to the local authority (though this is often more costly and time-consuming).

To avoid complications, it’s easier and more cost-effective to use a FENSA-registered installer.

Why Is a FENSA Certificate Important?

Having a valid FENSA certificate offers several key benefits:

1. Legal Compliance

The certificate confirms your windows were installed in line with UK Building Regulations, specifically regarding:

• Thermal performance and energy efficiency.
• Safety glazing where necessary.
• Proper ventilation and escape routes.

Failing to comply with these standards can result in enforcement action from your local authority.

2. Simplified Home Sales

When you sell your property, your solicitor will request evidence that any replacement windows meet current regulations. If you can’t provide a valid certificate, you may have to:

• Pay for retrospective approval from building control.
• Delay the sale of your property.
• Risk a reduced offer from buyers due to missing paperwork.

3. Insurance and Warranty Validity

Many home insurance providers require proof of compliant installations, and warranties from the installer may only be valid if the work was certified. A FENSA certificate provides this peace of mind.

How Do I Get a FENSA Certificate?

Only FENSA-registered companies can issue this certificate. When your installation is complete, your installer will register the work with FENSA, who will then issue the certificate directly to you—usually within a few weeks.

To verify a company’s registration status, use the official FENSA installer search. This ensures you’re working with an approved provider who understands the relevant regulations and installation standards.

What Does the FENSA Certificate Cover?

The FENSA certificate confirms compliance in these key areas:

• Energy efficiency — Confirming your new windows are A-rated or better. You can learn more about energy ratings from the BFRC.
• Ventilation — Ensuring that adequate airflow is maintained.
• Safety — Including fire escape windows and safety glazing where necessary.
• Building Regulations — Certifying that the installation meets all applicable legislation.

It does not cover:

• Conservatory installations.
• New build homes.
• Full extensions or major building work (these require building control sign-off).

For detailed guidance, you can also visit the LABC which outlines what is covered under building control.

Are There Alternatives to FENSA?

Yes. There are other Competent Person Schemes, including:

• CERTASS
• Assure
• BSI
• Network VEKA

All these schemes provide compliance certificates, but FENSA is the most widely recognised and accepted in the UK.

Can I Get a Copy of a Lost FENSA Certificate?

Yes, if you’ve lost your certificate, you can order a replacement directly from the FENSA website. There is a small charge for this service, and you’ll need the property’s address and approximate installation date.

Why Choose a FENSA-Registered Installer Like Skyway Windows?

At Skyway Windows, we take regulatory compliance seriously. As a FENSA-registered company, we ensure every window we install meets or exceeds UK standards. When you choose us, you benefit from:

• A free, no-obligation quote with honest, expert advice.
• A wide choice of products, including casement, sash, flush, and bay windows.
• Thermally efficient options that meet or exceed A-rated standards.
• A formal FENSA certificate issued after installation.
• A local team based in Surrey with years of experience working on properties across the region.

We also supply composite entrance doors and aluminium glazing systems for full home upgrades.

If you’re wondering, “Do I need a FENSA certificate for new windows?”, the answer is yes—when the work involves replacing existing windows. Make it simple by working with trusted professionals. Contact us today to arrange a free consultation.