Purpose of listing The main purpose of listing is to protect buildings of special architectural or historic interest and their surroundings from changes which materially alter the importance of the buildings or their setting. Once a building is listed, listed building consent may be needed, in addition to any potential need for planning permission, for works to the buildings, and breaches of the listed building regime are subject to criminal penalties and enforcement action. The definition of a listed building in the Planning (Listed Buildings and Conservation Areas) Act 1990 (P(LBCA)A 1990) is a building which is for the time being included in a list compiled under P(LBCA)A 1990 (see ‘What can be/is listed?’ below). Further: • any object or structure fixed to the building, and • 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 treated as part of the listed building (ie the building included in the