If you are intending to replace any windows or doors please refer to the Replacement Windows information leaflet which is available to download.
Should you wish to make an application through the Local Authority Building Control please refer to How to Make an Application.
If your intended installer is FENSA registered you could visit the FENSA website to find out more information
You can now search for FENSA registrations against individual properties or should you need to re-order a certificate from them you can now do so by visiting their website.