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“floor area” means the aggregate area of every floor in a building or extension, calculated by reference to the finished internal faces of the walls enclosing the area, or if at any point there is no such wall, by reference to the outermost edge of the floor;
https://www.legislation.gov.uk/uksi/2010/2214/regulation/2/made
https://www.legislation.gov.uk/uksi/2010/2214/regulation/2/made