During 2010 the government will introduce new codes within the building regulations. The one that we are concerned with is document L, remember it's the one that introduced low E glass. This time it will increase the WER (window energy rating) minimums from E to C for replacement windows. It is anticipated that a move to A will happen before 2016. In addition low E glazing will become mandatory for the vertically glazed sections of conservatories.
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