Building regulations do not require planning permission to be sought in most cases for conservatories and orangeries as they are considered as permitted development. There are a few conditions that must be met in order for planning permission not to be required including the following: The property must not have already been extended The conservatory or orangery must not extended over more than 50% of the garden area The roof must not reach any higher that the existing property roof (and must not exceed 4 metres, or 3 metres if within 2 metres of a boundary) The conservatory/orangery should not include any elevated platforms Your installers will be able to advise you on whether your proposed conservatory or installer is likely to require planning permission. If you are unsure, you can contact your local planning authority.