Pembroke & Nash will certify your new windows with a certificate of compliance for building regulations.

Here are some FAQ’s regrading your new windows and FENSA


Why do I need a FENSA certificate?

FENSA certificate is your assurance that the installer who fitted your windows or doors has complied with Building Regulations document L & K. It also means that your installation(s) will have been registered with the Local Council. These are legal requirements and proof of them is essential when selling your home.

What happens if i try to sell my home and I do not have a FENSA certificate for my new windows?

This can hold up or even make a property sale fall through. It is a legal requirement that your windows comply with Building Regulations. A FENSA certificated installer will be trained and complaint with building regulation requirements. You could get a retrospective building control control certificate from the local council, however the likely hood that the windows have been installed correctly could be slim. So this might not be an option.

My property is Listed, do I still need a FENSA Certificate?

Generally speaking no. Our window surveyor will confirm this aspect, but we always advise that you contact your local council. Listed buildings are exempt from building regulations so they can retain there heritage. However it may be required that you will need to improve the insulation elsewhere in the property to make up form the lack of heat retention in your new windows.

Does Slimlite / Slimline glazing comply with a FENSA installation?

The answer to this question is NO. The centre pane U value of a Slimlite / Slimline double glazed unit will not comply with building regulations. This can sometimes be an issue with planning in conservation areas and Building regulations. They can contradict each other. Planning approval does not mean building regulation approval. We have come across many instances where we have been asked to supply windows in accordance with an Architects planning approval and subsequently informed the client of the Architects mistake.


For further questions on FENSA and new windows in general please contact us for some free advice.

FENSA Installer

FENSA Compliant Windows


Please fill in the form below if you would like to arrange a free survey or to ask a question?


Please replacing windows in a Listed building.