Willowbank Windows & Conservatories is a member of FENSA – the government authorised scheme for homeowners looking to replace windows and doors. FENSA regularly inspects our installations to ensure the Building Regulations standards are consistently maintained.


In choosing a FENSA double glazing registered company you, the consumer, are offered greater protection when purchasing double glazing for your home. For peace of mind, you should use a FENSA registered business for your double glazing installations.

All replacement glazing comes within the scope of the Building Regulations. Anyone who installs replacement windows or doors must comply with current thermal performance standards.

Should you wish to sell your property, your purchaser’s solicitors will ask for evidence that any replacement glazing installed since April 2002 complies with the Building Regulations. There are currently two ways to prove compliance:-

  • a certificate showing that the work has been done by an installer who is registered with FENSA or a similar body
  • a certificate from the Local Authority Building Control stating that the installation has been approved under the Building Regulations

Any installation undertaken by a company which is not registered with FENSA or a similar body, or has been done as a DIY project by a homeowner, will need full Local Authority Building Control approval. All Local Authorities will know of the registered businesses in their areas and can identify unauthorised work very easily. It should be noted that the homeowner is ultimately responsible for ensuring the installation complies with these requirements.

Before you sign a contract to buy any replacement glazing, be sure to ask whether the installer is FENSA registered. If not, an application to Local Authority Building Control for approval under the Building Regulations will need to be made by either the installer or the homeowner, for which there will be associated charges.

By using Willowbank Windows and Conservatories you can be assured that your replacement windows and doors meet the Building Regulations and that your Certificate of Compliance will be forwarded to you directly from FENSA, along with an insurance-backed Guarantee Certificate with no additional charges.