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Government Permitted Development Rule


Under the Government Permitted Development Rule (GPDR) of 3 metres depth total area space development from the encasing edges of the property's original construction, do you in an application where there is more than one extension being sort (for example rear extension and loft conversion) - -combine the total area space of all planned extensions into a single depth figure in order to measure if it fits GPDR scheme?

Request Date18 May 2016
Requested byIndividual
Released Date  

16 June 2016


Permitted development rights for extensions to an existing dwellinghouse are set out in Class A of Part 1 to Schedule 2 of the Town and Country Planning (General Permitted Development Order 2015 (as amended). There are various criteria that need to be met in order for an extension to be considered as permitted development - the three metre depth limit that you refer to being just one of those criteria (Class A.1 (f)(i). There is no floor area limit within the Class however - except in that any development, together with the main house and any other buildings within the curtilage, must not exceed more than 50% of the area of the curtilage of the property. The factors limiting the size of an extension otherwise relate to height, width and depth limits.

Where a roof extension is also proposed, however, that element of the proposal would be considered under Class B of Part 1, which has its own limiting criteria, including a maximum volume that is permitted. That maximum volume would include the volume created by any other roof extensions that have been previously carried out to the original property, but there is no requirement to combine the floor area or volume of any extensions to the house with the floor area or volume created by the dormer window.

These matters can be complex, however, and the Council would strongly advise any customer to submit a Certificate of Lawfulness application before carrying out any works to confirm whether or not they meet the criteria of permitted development.