casement window
Energy Efficient Windows and Doors
Energy InformationEnergy Diagrams

Background
Buildings are one of the major users of energy and one of the main areas of energy losses in any building is via the glazing. Improving the energy efficiency of windows and doors gives large improvements in the energy efficiency of buildings. Windows are in place for a long time and efficiency gains achieved by fitting high performance windows are effective for the life of the product. This will significantly reduce dual bills, improve comfort and reduce greenhouse gas emissions for the life of the window installation.
The UK government has committed itself to huge reductions in CO² emissions within the Kyoto Agreement. This can only be achieved by significantly reducing the energy use of houses. Government, consumers and specifiers are focusing more and more on the energy efficiency of building products. Windows are one of the prime components of interest.

What is the Window Energy Rating?
The British Fenestration Rating Council (BFRC) is an independent, government-backed initiative set up to enhance the energy performance of buildings. BFRC is conjunction with the UK glazing industry and European partners has developed a Window Energy Rating to assess the energy performance of domestic windows.

Building Regulation
The BFRC Rating for windows is now included in the Building Regulation Part L with effect from April 2006. Beside the existing target U-Values for replacement windows, compliance to Part L can be shown using certain Window Energy Ratings. The standard for replacement windows in an existing dwelling should be an energy rating of 'E' or better and the standard for new windows in extensions should be a 'D' Rating or better. For new dwellings the compliance with Part L is proven via a Target CO² Emission Rate, which needs to be met, without specific BFRC requirements for the windows.

Energy Saving Trust
C Rated windows or better are included in the Energy Saving Trust scheme "Energy Saving Recommended". The "Energy Saving Recommended" certification mark was developed by the Energy Saving Trust to distinguish the most energy efficient products on the market. Again this logo is widely known to the public.