In Jan 2002 I added a conservatory without separation and converted the loft. I did not tell building control because I was told it was not necessary as the conservatory was within the size limits and the loft had velux windows and there was no change externally. I am now selling up and have been visited by building inspector as required by a surveyor appointed by the buyers. The inspector says I need separation between the conservatory and house because of heat loss and also will not accept rockwool insulation in loft. I know there were far reaching changes in bldg regs from April 2002 - can anyone tell me if the above requirements applied in the new rules but not the old.