Doors and Windows

Windows and doors are the weakest part of a building's thermal performance, so improving the thermal resistance of these areas will have a significant impact on the overall performance of the building envelope.

They also let in natural light, which of course reduces the reliance on electric lighting and therefore reduces energy consumption and CO2 emissions. There are many products now available to allow light into almost any room, such as sun tunnels and rooflights.

New innovations in the types of glass available also bring further benefits. Self-cleaning glass, for example, reduces the amount of water and detergent needed for cleaning, and coatings are now available to reduce solar glare making the internal space more comfortable.