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Introductory guides to permitted household development may be found on the planning portal and for convenience have been reproduced below. Some additional restrictions apply within the Peak District National Park and within Conservation Areas.

Whilst the wording of the 2015 Order seems clear enough, it does not consider in detail, the complex shape, position and orientation of many dwellings. Whether a proposal is permitted may depend on what is the "principal elevation". The Department for Communities & Local Government, recently published technical guidance to help clarify such matters:

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