Christian McArdle wrote:
They are not strictly illegal...building regs basically means you
shouldn't repair to a WORSE standard of insulation...

Installing a new window complete with frame doesn't count as a repair and
must be done to current standard, with some exceptions.

The exceptions basically amount to sheds and listed buildings if you can
convince the council.

Christian.


Not quite.

IF you markedly improve insulation in the area to which the window is
fitted, and can demonstrate that the loss subsequently is less than
would have been the case with a double glazed unit alone, the BCO will
let if through.

However, its not worth the argument unless there is some special
aesthetic reason to retain SG. With U PVC specified, aesthetics don't
really feature though..