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Do I need planning permission?
1. Overview
You will need to get planning permission for a new building or for any major changes to existing buildings.
However, smaller changes, such as those made to houses, may not need planning permission, subject to certain limits and conditions. A much wider range of changes to houses within Conservation Areas,including replacement windows and doors, are likely to require planning permission.
Home improvements such as adding an extension or conservatory could be classed as permitted development, not requiring an application for planning permission, provided certain limits and conditions are met.