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As one of the leading glazing installers in London, we are of course a FENSA-registered company. FENSA is a government-run Competent Person Scheme that oversees building regulation compliance for home improvement projects. Replacement windows, doors and roof lanterns have required FENSA certification since 2002. Without one, you could run into problems when you eventually try to sell your property. So, what exactly is covered by a FENSA accreditation?

What does FENSA do?

FENSA covers the replacement of glazing products such as:

The government scheme ensures that all replacement installations are done in accordance with current building regulations, meeting standards relating to energy efficiency and structural integrity. All FENSA registered companies are regularly assessed to ensure that building regulations are continually adhered to. As a FENSA registered company, our standards cannot slip and we must always provide consistent quality installations for our customers. The organisation’s mission is to improve installation standards, not just in London, but across the UK.

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Why choose a FENSA-approved company?

Opting for a FENSA-approved company is the only way to ensure that your installation receives a FENSA certificate. This certificate is crucial as it:

  • Confirms that the installation is compliant with building regulations
  • Verifies the installation’s energy efficient
  • Verifies the installer’s guarantee is insured, in the unlikely event that the company ceases to trade before the guarantee expires
  • Ensures that the project is registered with the Local Council

Having a FENSA certificate for replacement windows or doors is absolutely crucial when it comes to selling your property. Without one, you can run into major obstacles that could uphold the sale process. This is why it’s important to put your trust in a FENSA-certified installer like Unique Glazing.

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How long does a FENSA certificate last?

A FENSA certificate usually lasts as long as the products do. Certification also serves as evidence that the installation is covered by an insurance-backed guarantee of up to 10 years in length.

After the replacement project is complete, you should receive your FENSA certificate around two weeks afterward.

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When is a FENSA certificate not necessary?

FENSA only deals with replacement windows, doors and roof lanterns. It does not apply to products being installed for the first time for projects such as:

FENSA also does not concern itself with general, simple repair work. However, before undertaking any home improvement or glazing project, we always recommend checking with your local authority that you are compliant with building regulations. Read about the new June 2022 building regulations here.

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FENSA accredited glazing in London

Unique Glazing has a fantastic relationship with FENSA. With their help, we have been able to supply London homeowners with quality windows, doors, and more for many years. For more information on our range of glazing products, please feel free to get in touch.

Delivering Customer Satisfaction

We strive to provide the best service for our customers. Here are some reviews from our happy customers.

Excellent

Amazing ..they were very clear on costs and delivered what I expected The work was immaculate and everything clean and tidy afterwards Thanks so much

Checkatrade Customer

June 2026

Fitting windows and french doors to a purpose built garden room

very professional, courteous and responsive. we were very pleased with the customer service and the finished product/ workmanship. we would use this company again and recommend to others

Checkatrade Customer

June 2026

Good service from initial start

Good service from initial contact through to install. Good communication from Paul the salesperson. Efficient and polite survey carried out by AJ. Great install team, got right on it from...

Checkatrade Customer

July 2026

Front and back door installation

We had both front and back doors replaced and we are very happy with the results. Communication was excellent and they were flexible around my work and family commitments. I...

Checkatrade Customer

July 2026

Professional Door Installation

Fitting of the French doors went smooth. The work was clean and tidy , and the guys were polite. Conversation was a bit poor would’ve been nice for them to...

Trustpilot Customer

July 2026

Reliable And Professional

We got our old windows and doors replaced by Unique Glazing co ltd Excellent job, Good quality product,Good and professional service, Fitters were very hard working and knew their job...

Trustpilot Customer

January 2026

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