FENSA Certificates Explained: What London Homeowners Need to Know Before Replacing Windows

If you're planning to replace windows or doors in your London home, you've likely seen the term "FENSA registered" mentioned by installers. Here's what it actually means, and why it matters more than most homeowners realise.

What Is FENSA?

FENSA stands for the Fenestration Self-Assessment Scheme. It was established by the Glass and Glazing Federation in response to building regulations covering window and door replacements in England and Wales. In short, it's a government-authorised competent person scheme that allows registered installers to self-certify that their work complies with current building regulations, without needing separate local authority sign-off for every job.

Why It Matters When You Sell Your Home

This is the part many homeowners don't realise until it's too late. When you come to sell your property, your solicitor will ask for proof that any window or door replacements complied with building regulations at the time of installation. Without a FENSA certificate (or equivalent building regulations compliance certificate), this can delay a sale, or require costly retrospective inspections and indemnity insurance.

If your installer isn't FENSA registered, you may not receive this certificate — leaving you exposed later, even if the work itself was done well.

What a FENSA Certificate Confirms

• The work was carried out by an installer who has been assessed and registered under the scheme

• The installation complies with current building regulations, including thermal performance and safety standards

• The certificate is registered with the local authority on your behalf

• You're covered by an insurance-backed guarantee for defect rectification, adding an extra layer of protection

  
  

What to Ask Before Choosing an Installer in London

Before agreeing to any quote, it's worth asking directly:

1. Are you FENSA registered, and can you show your registration number?

2. Will I receive a FENSA certificate after installation?

3. How is the certificate registered with the council?

4. What guarantee or insurance backs the installation?

   
   

Any reputable installer should answer these clearly and confidently, without hesitation.

Choosing a FENSA Registered Installer

We're a FENSA registered company, which means every window and door installation we complete across London and Essex is certified compliant with current building regulations, giving you documented protection for the future — particularly important if you plan to sell.

Have questions about FENSA or building regulations for your project?

Call 020 8550 2929 or [contact our team here].