If I want to replace one or more windows in my home, or any other type of building, will the building regulations apply?

Department: Environment Services
Division: Environment Services/Building Control

YES - if you are replacing the whole of the fixed frame and opening parts. 

If the work is to your home, and you employ a FENSA (Fenestration Self-Assessment Scheme) registered installer, you will not need to involve the building control department.  But on completion the installer must give your local authority a certificate that the work complies with Part L and other appropriate parts of the building regulations.  You will be provided with a certificate of compliance for your records. 

NO - if the work amounts to no more than, for example, replacing broken glass, replacing fogged double-glazing units, replacing some rotten sashes (i.e. opening parts) in the main window frame, or replacing some rotten sections of the main frame members. 

If your building is listed nationally, or locally in some way, for its architectural or historic interest and/or is located in a sensitive urban or rural environment (e.g. a Conservation Area or an Area of Outstanding Natural Beauty), you should note that English Heritage have produced an Interim Guidance Note on the application of Part L ('Conservation of fuel and power') of the building regulations. The note offers advice on how to balance the needs for energy conservation with those of building conservation. 

Please note that you may require planning permission and you are advised to contact our planning team on 020 8753 1081 for planning advice before commencing any building work.