What is FENSA

FENSA logo

FENSA is an acronym that stands for Fenestration Self-Assessment Scheme. It was set up, with approval from government bodies, by the Glass and Glazing Federation (GGF). The organisation’s prime function is to regulate double glazing companies and ensure compliance with Building Regulations.

If you want to replace double glazing, it needs to comply with the Building Regulations for thermal performance. Now, you can get the permission and certification for this from your local building authorities. Alternatively, you can get an installer who is accredited by FENSA.

A FENSA-registered double glazing installer will be aware of local building regulations. Moreover, he is equipped under the Competent Person Scheme to certify the installation. As a result, you don’t have to get the approval and certification yourself. You can hand over the responsibility to your installers. They will take care of everything from start to finish.

What is the Competent Person Scheme

The short answer is, this is a form of self-governance and regulation. These government-approved bodies register installers. They do so after making sure that their service and installation is up to the mark. Once they are registered, they are given the authority to self-assess and certify their installations.

In April, 2002, the government decided to regulate double glazing installation. However, it is quite a task to manage, monitor, and certify all windows and doors installations across the country. This is why the Competent Person Scheme came about.

There are 6 bodies that were set up under this scheme. Each of them monitors its members. Additionally, each of them equips its members to certify their installation. Since the regulatory bodies manage their own members, it’s a self-governed process.

This makes it easy for building authorities to ensure compliance. Moreover, homeowners don’t have to run around to get paperwork and certifications for their new double glazing.

FENSA approved installers make planning permissions and certification easy

What is the Purpose of FENSA?

FENSA was established due to the change in regulations in April, 2002. This is when Building Regulations decided that double glazing installation needed to be standardised. This was necessary to lower the national carbon footprint.


When we heat up our homes, a certain amount of heat escapes through conduction. The biggest culprits are the doors and windows. Single glazed windows and doors are notorious for not retaining heat inside.

The more heat your doors and windows let out, the longer you have to run your heating. As a result, your home consumes more power. If you could insulate your home better, you would not need as much energy in heating.

By regulating the thermal performance of double glazing, FENSA and GGF are trying to reduce energy consumption. Additionally, these bodies also ensure that regulations for ventilation and fire safety, are also followed.

How Does FENSA Function?

The way FENSA works is by inviting double glazing companies to register. They then screen each applicant for their quality and performance. After they are satisfied that the applicant is up to the standards set by them, they allow them to display the FENSA logo.

Additionally, the installers get a ID that displays their company along with their FENSA affiliation. Once FENSA registers the company, they can assess their own installation. Once they complete the installation, they can issue a certificate of compliance.

In order to join the FENSA network, companies have to prove their commitment to quality. To this end, they need to do more for their clients. As a result, you get an insurance-backed guarantee on your installation. They are also required to provide deposit protection to their clients.

Why Should You Choose FENSA Approved Installers?

FENSA approved installers give quality service and installation

Even though there are 5 other Competent Person Schemes that regulate double glazing installations, FENSA is the most popular. This is because of its high standards and commitment to excellence. As a result, it also has the largest network of approved double glazing companies.

When you choose a FENSA approved installer, you get the benefit of this body’s standards and protection. You can be sure that your installation will be of the highest industry standards. Moreover, the body protects the customer’s interests with compulsory guarantees and indemnities.


You can find FENSA-registered double glazing companies extremely easily. You can find recommended local companies on their website.

Additionally, they provide all accredited installers with a member ID card. The card displays the installer’s name, company as well as the FENSA logo. The card is impossible to fake because of its security features.

This regulatory body demands high standards from all its members. FENSA constantly monitors and re-assesses for constant, ongoing perfection. As a result, you have the peace of mind and the assurance of a regulatory body.


As per the requirements of FENSA, all registered double glazing companies need to provide insurance for their work. This includes the installation quality as well as certain aspects of the performance.

Moreover, an indemnity protects your initial deposit. Essentially, FENSA protects your double glazing and you.

Compliance and Certification

One of the biggest headaches you might face with new double glazing is getting it certified and registered. Suppose you call an unapproved installer to install it. Now you run the risk of it not being compliant with regulations. In such a case, your installation will not be certified. Additionally, the installer and you may face penalties.

With FENSA approved installers, you don’t have to worry about such problems. They ensure that the installation complies with building regulations. Moreover, they can certify their own installation. This way, you don’t have to expend energy getting the certification from local authorities.

Moreover, they will also get your double glazing registered. The best part is, the installation cost covers all these costs. This way, you don’t have to pay extra for the convenience of not having to deal with the paperwork!

Find a FENSA Approved Installer Near You

If you are looking for a reliable double installation, we are happy to recommend a FENSA registered company near you. Simply get in touch with us. Someone from our team will contact you and give you a list of registered local installers.

Alternatively, you can use our online quote generator to get a quick quote. Once you’ve informed it of what you need, it will generate a quick quote. Additionally, it will give you a list of local installers as well.