# Town and Country Planning Act 1971, Paragraph 4


For the purposes of this Schedule gross floor space shall be ascertained by external measurement; and where different parts of a building are used for different purposes, floor space common to those purposes shall be apportioned rateably.

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Source: https://www.legislation.gov.uk/ukpga/1971/78/schedule/18/paragraph/4 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-act-1971/schedule-18/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.