There is a very good section on Permitted Developemt on this link by the Planning Portal for Outbuildings
https://www.planningportal.co.uk/info/200130/common_projects/43/outbuildings
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There is a very good section on Permitted Developemt on this link by the Planning Portal for Outbuildings
https://www.planningportal.co.uk/info/200130/common_projects/43/outbuildings