Planning Permission
Adding a conservatory to your house is considered to be permitted development, not needing an application for planning permission, subject to the limits and conditions listed below.

1. No more than half the area of land around the "original house"* would be covered by additions or other buildings.
2. No extension forward of the principal elevation or side elevation fronting a highway.
3. No extension to be higher than the highest part of the roof.
4. Single-storey rear conservatory must not extend beyond the rear wall of the original house* by more than three metres if an attached house or by four metres if a     detached house.
5. Maximum height of a single-storey rear extension of four metres.
6. Extensions of more than one storey must not extend beyond the rear wall of the original house* by more than three metres or be within seven metres of any boundary  opposite the rear wall of the house.
7. Maximum eaves height of an extension within two metres of the boundary of three metres.
8. Maximum eaves and ridge height of extension no higher than existing house.
9. Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.
10. Roof pitch of extensions higher than one storey to match existing house.
11. No verandas, balconies or raised platforms.
12. On designated land* no permitted development for rear extensions of more than one storey; no cladding of the exterior; no side extensions.