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PP31/EO1030191
Listers glazed windows exceed the current thermal requirements stipulated in Part L of the building regulations. All Listers glazed windows are licensed by the BFRC for their energy efficiency performance. They are also recognised by the Government's Energy Savings Trust as leading the field in this area.
For even more stingent thermal and energy efficient performance see the information on Window Energy Ratings. You can just click here to go to the Energy Ratings Page.