FENSA – A Double Glazing Certificate

The FENSA Certificate is something that companies who provide double glazing services should hold, enabling the homeowner who is getting doors or windows replaced to obtain a certificate. FENSA was born out of the government introduction of a CPS – Competent Person Scheme. This was to ensure that companies in England and Wales adhered to the building regulations, and the work that people had carried out on their homes by them, met these standards. This was a way that both companies and individual tradesmen could self-certify, making quality services easier to find for customers. Here we discuss FENSA, a double glazing certificate, what is means, and why you should use companies who are registered with a CPS such as FENSA.


What is a FENSA Certificate?

A FENSA Certificate is proof that the person, or company, carrying out the glazing work on your property is a FENSA member. This is a requirement for those having doors and windows installed or replaced as from the 1st of April 2002. There is a bit of leeway for those who signed a contract before the 1st April 2002, which is as long as their glazing work was completed before the 30th June 2002, the FENSA Certificate would not be required. But, in current times it is always best to choose a glazier registered with FENSA, and to obtain the certificate afterward, to demonstrate that the work carried out on your property meets the building regulations set out for England and Wales.


What does a FENSA Certificate cover?

While the FENSA Certificate covers all sorts of exterior windows, and doors, that have been replaced, it does not include cover for conservatories or extensions added onto the original property. It not only covers glazing on exterior windows and doors, but roof windows and also roof lights, providing room sizes have not been altered from the original plan of the building.

FENSA Certificate covers;

Exterior windows

Glazed doors

Roof windows

Roof lights


Does the FENSA Certificate cover conservatories?

As mentioned above, the FENSA Certificate does not cover conservatories. On domestic properties, ground level conservatories used for general daytime living purposes are not covered by FENSA. There are various other factors too, but in general, the average household conservatory is not covered.  If however, the glazing between the home and the conservatory has to be replaced, then this is covered by FENSA as it is regarded as exterior glazing to the property. As well as FENSA not covering conservatory glazing – porches, extensions, garages and any out buildings are not covered either.


What is not covered by FENSA?

While FENSA covers the replacement of exterior glazing in the form of windows, and applicable doors, it does not cover conservatories or external porches or extensions, as well as many other aspects which may affect the topic of glazing. The FENSA certificate will not cover commercial premises or listed buildings, this is something for domestic properties only. It will not cover issues outside of building regulations, planning issues, cosmetic issues, conversions, contractual or guarantee issues either.

NOT covered by FENSA;

Commercial property

Listed buildings



Porches and extensions

Planning issues

Cosmetic issues

Property conversions

Contractual issues

Guarantee issues

See the official FENSA website for a comprehensive list of what is covered and not covered by the FENSA certificate.


What are the advantages of a FENSA Certificate?

A FENSA Certificate from the company replacing your glazing is something that proves they are above board and adhere to the high standards of the building regulations set out in England and Wales. Obtaining a certificate is not only reassuring to the homeowner, but cost effective too. This means that local authority building inspections are not required, meaning that extra fees from these inspections are not likely to be incurred. When it comes to selling the property, the homeowner can provide their FENSA certificate as proof that the glazing was replaced by a member of such a CPS scheme, which will again save costs for extra inspections. When you come to selling your home and you cannot find your FENSA certificate, the body have made it an easy straightforward process to obtain a replacement copy. You can rest assured that if you use a glazing firm which is a FENSA member, they have undergone a strict assessment to ensure that they continue to meet the building regulation standards.


How do I get a FENSA Certificate?

In most cases, the glazier that carries out the work on your property will issue you with a FENSA certificate, providing they are a member. If they hand you a physical copy of the certificate, you can then go online and complete the process. Homeowners can then obtain replacement certificates or view details on the work in an easy manner. You can also obtain information online and order replacement certificates for a small fee if need be.


If you have had glazing work carried out by a member of FENSA, your certificate may take a few weeks to come through as there are certain procedures that take place when registering the work. The member will inform the FENSA body of the work carried out on your property, and in some cases the work may be selected for a spot inspection which can slow the process down a little. This is a good thing however as it does show that FENSA take companies and individuals adhering to the building regulations incredibly seriously. FENSA will then inform your local building control of the work that has been carried out, and following this your certificate will be dispatched.


It is important that you keep hold of your FENSA certificate as it may be required in certain circumstance, such as selling your property, that building regulations have been adhered to and the work approved. If it is mislaid however, it is a straightforward process to obtain another copy, however a small fee is involved.

To see a list of the best double glazing companies keep reviewing our site. Here we also have a list of the top ten double glazing companies.