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Building control regulations for windows

NEW - Tougher Government Glazing Regulations


All new or replacement box sash windows, installed after April 2002, have to comply with Document L, which is a considerable toughening up of the Government's glazing regulations.

Document L?

Document L deals with the heat saving properties, the "U-Value", of windows. The better heat saving properties, the lower theU-Value.

Do I benefit from Document L?

Yes, you do. All new or replacement windows have to be manufactured to meet the new, higher demands on insulation, giving you more warmth and comfort as well as better heating economy.

In fact, it means that, unless it is a listed building, the new or replacement windows have to be double glazed, whether or not they were before.

But can I have double glazed box sash windows that actually match my existing traditional ones?

Yes, you can! just have a look at Double Glazing & Draught Proofing

How can I be sure that my new or replacement windows do comply?

Windows that comply with the new regulations are accredited by the National Physical Laboratory.

Your windows will be supplied with certificates that authenticate compliance.

Ensure that the certificate covers the complete window and not just the glazed units - this is important for your windows to meet the standards.

To find out with whom to deal simply click on Recommended Suppliers

How can I tell if my supplier is accredited ?

Yes it is - as long as you use an accredited supplier. All installations must be either registered at your local councils building control department to obtain a certificate of compliance.

Alternatively, FENSA, has been set up to enable window companies self certify installations to customers without the need to pass through the Local Authority .

Random checks will be made by FENSA to ensure registered installers meet the standards.

So, it is in your interest to ensure that your supplier is a FENSA registered member.