Yes - when a building is listed it refers to the whole building (interior and exterior) and any object/ structure which is within its curtilage.
Buildings are listed on the ‘List of Buildings of Special Architectural or Historic Interest’, under the Planning (Listed Buildings and Conservation Areas) Act 1990. In the act, any object or structure fixed to the building is part of the listing. Also, any object or structure within the curtilage of the building, which although not fixed to the building forms part of the land and has done so since before 1 July 1948, is also treated as part of the listed building.