Window Energy Ratings

In October 2010 the latest revisions to Part L Building Regulations came into force. Amongst the changes are new requirements for the energy performance of windows. The minimum requirement for Window Energy Rating has risen from an ‘E’ to a ‘C’ within the Window Energy Ratings Scheme (WERs). It’s predicted that this will increase to an ‘A’ in 2016. At the Stroud Window Company we can guide and support our customers to meet these new regulations.

So exactly what are Energy Efficient Windows? They are windows that help to contain and conserve heat within the home keeping out wind and rain, resisting condensation and yet allowing natural “free” energy – the warmth of the sun – to heat the home. They can be made using any frame material – aluminium, PVC-U, steel or timber or even a combination of materials.

Without a doubt, the most well-known energy-efficient glass product is Pilkington K Glass™. This is the UK’s best-selling low-emissivity glass and it is specifically designed to prevent heat from escaping through your windows, reflecting heat back into your home.

The Pilkington energiKare™ insulating glass unit uses Pilkington K Glass™ for the inner pane and, Pilkington Optiwhite™ for the outer pane. Pilkington Optiwhite™ is an “extra clear” glass, which allows more sunlight and solar heat to enter your home from the outside. By using a combination of these two special types of glass Pilkington energiKare™ is one of the leading insulating glass units, and when installed in an appropriate frame can achieve a Window Energy Rating of band A.

Pilkington energiKare™ insulating glass units can be installed into most types of existing window frames.

Energy Ratings