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Building Regulations and Window Energy Ratings

Window Energy Ratings (WERs)

The rainbow style energy rating label to the left has been endorsed by the British Fenestration Rating Council (BFRC). There are various other competent persons bodies operating within the window industry who can also endorse these labels. The other main ones are CERTASS and BSI. 


An 'A' rated window means that there is theoretically no energy lost through the window. Some installers now offer an 'A' rating as standard. You will also find A+ and A* ratings on offer.


For further information on achieving a Window Energy Rating (WER), click the 'next' arrow to the right.

Building Regulations and WERs Page 2

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