Do I need planning permission to build an extension to my house?
House extensions often require planning permission, but depending on their size and location, there are some occasions when permission is not required to construct them. There are certain criteria that a proposed extension is assessed against to determine whether permission is required to build it and these criteria can be found within The Town and Country Planning (General Permitted Development Order) 1995 (as amended).
If you would like to view the full list of criteria regarding Permitted Development and household extensions, go to the Planning Portal website (Opens New Window)
If your proposed extension complies with the listed criteria, then planning permission may not be required to build it. However, this advice is for guidance only and specific advice should always be sought in writing from South Bucks District Planning Authority. For formal written confirmation that planning permission is not required for a development you can apply for a Certificate of Lawfulness.
It should also be noted that flats, maisonettes, and mobile homes are not classed as dwellinghouses and, therefore, do not have Permitted Development rights. In addition, conditions are often placed on previous planning permissions that remove Permitted Development rights from a property.
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