# Town and Country Planning Act 1990, Paragraph 4


(1) For the purposes of this Schedule gross floor space shall be ascertained by external measurement.
(2) 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/1990/8/schedule/10/paragraph/4 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-act-1990/schedule-10/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.