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Video: Grade listing of buildings

Listed buildings are those judged to be "of special national, architectural or historic interest" and are protected against unauthorised alteration, extension or demolition. Approximately half a million buildings in the UK are listed, amounting to about 5% of the country's entire building stock. This programme takes a look at the criteria underlying the main Grade Listings, the authorities that determine them and the practical consequences for owners, architects and builders. It also explores the ideological and instrumental reasons for protecting buildings, the irony of conserving Modernist structures, and the conflicts between preservation and construction.