 In the United Kingdom , the term listed building refers to a building or other structure officially designated as being of special architectural , historical , or cultural significance ; Grade I structures are those considered to be " buildings of exceptional interest " . <unk> was begun by a provision in the Town and Country Planning Act 1947 . Once listed , strict limitations are imposed on the modifications allowed to a building 's structure or fittings . In England , the authority for listing under the Planning ( Listed Buildings and Conservation Areas ) Act 1990 rests with English Heritage , a non @-@ <unk> public body sponsored by the Department for Culture , Media and Sport ; local authorities have a responsibility to regulate and enforce the planning regulations . 
