What is Window Energy Rating (WER)?

The window energy rating is the objective method used to assess the total energy performance of a window; it takes into account the materials used (glass, framing materials etc), the air leakage and the solar gain to determine the rating which expresses the energy efficiency of the product.

The determined value will place the window design into a rated band (A to G). The rating compares standard size windows; this provides a simple method of comparing different products from either the same supplier or from different suppliers.

Most of you will be familiar with the Energy Efficient label and A-G rating on "white goods", like refrigerators, which operates on the same principle as that for windows.

Why are standard size windows used and not actual size for my house?

Is WER just for the UK?

How is energy saved by fitting WER windows?

What are the benefits for consumers?

What are the benfits for suppliers?

What are the benefits for specifiers?

Who are the BFRC?