What are Window Energy Ratings?

Window Energy Ratings (WERs) are similar to the energy efficiency labels found on kitchen appliances like fridges and washing machines.

An A+ rated window is the highest rating you can get and current Building Regulations (Part L 2010) requires all domestic replacement windows to be rated at C or above.

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Most existing double glazed windows, even those installed in the last 10 years (when the first energy efficient windows were introduced) will only be an E rating at best.

Using PLANITHERM – the most energy efficient window glass – it is easy to achieve a B rated window with most choices of frame and it is much easier to reach an A+. Many homeowners are upgrading their windows with A and A+ rated windows as it gives the maximum energy efficiency for a modest additional cost.