Conservatories forward of the principal elevation or side elevation of the original house and fronting a highway are NOT permitted development.
Side conservatory must not have a width greater than half the width of the original house.
Side conservatories to be single storey with a maximum height of four metres.
If a conservatory (at side or rear) is within two metres of a boundary maximum eaves height should be no higher than three metres to be a permitted development.
Single-storey rear extensions must not extend beyond the rear wall of the original house* by more than four metres if a detached house; or more than three metres for any other house.
Where not in designated land (Article 2(3))* or a Site of Special Scientific Interest, this limit is increased to eight metres if a detached house; or six metres for any other house.
Single-storey rear conservatory must not exceed a height of four metres.
Maximum eaves height should be no higher than the eaves of the existing house. The highest part of the conservatory should be no higher than the roof ridge line of the existing house.