The installing firm must be FENSA registered, if it is not, OR you do it yourself, you have to pay building control. The windows have to conform to building regulations requirements regardless. This is all to do with energy saving targets, meanwhile some of my customers run outdoor heated swimming pools which use far more oil than a house uses in a year, but that's not wasting energy.
if you have existing veluxes that need replacing then you could use fensa registered installers as opposed to your LA but if they are new you can only use your LA
anything else(. new openings for new windows, slightly enlarging exisiing openings, putting french doors in where there was a window etc) will be outside the scope of fensa and you must make application to your LA
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