A conservatory has been in place for a number of years, no problems structurally. But if minor changes are made (which in themselves would not require permission) how would the building regs come to apply?
ie is permission needed to carry out the minor changes, or is permission needed on the basis of 'converting' the conservatory?
The roof should be more than 75% transluscent for it to be classed as a conservatory, but how will the building regs apply if the roof is changed so that it is less than 75% translucent? What does the room become? Does it become an 'habitable room' even though it will not be used like other rooms? Does it become a bedroom or a lounge, could it be a store or a hallway - who decides?
I'm particularly intrested in the structural side of what will be required. If it is to be classed as an extension, then normally an extensions' foundations would be typically 1 metre deep, but a conservatory's only say 500mm. So as part of any conversion work, would the BCO insist on underpinning? Would calculations be required for the [existing] roof structure, as it is not covered in the building regs and thus 'non-standard'.
The gist is, how far can/would a BCO be expected to go in terms of what work would be required?