3. How will the windows have to comply with the Regulations?

In a new building or extension to an existing building the windows (that is the frame and the glass) will have to have a specific thermal efficiency rating, known as a U-value. For steel windows this U-value is 2.2W/m²K.

In the case of replacement windows an alternative means of compliance is to use glazing with a maximum centre pane U-value of 1.2W/m²K.

4. Do I have to meet these steel window U-values?

No. The Regulations allow different means of complying. Designers are allowed to trade off increased efficiency in the heating system and insulation against other building components, such as windows.

Alternatively, in existing properties, the Regulations make considerable allowances for what are termed 'historic' buildings.

5. So what constitutes a historic building?

The definition of historic buildings includes: -

Listed buildings

Buildings situated in Conservation Areas

Buildings of local architectural and historical interest and which are referred to as a material consideration in a local development plan.

Buildings within National Parks, areas of outstanding natural beauty and World Heritage sites.

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