# The Town and Country Planning General Development Order 1988, Paragraph A.3: Interpretation of Class A


For the purposes of Class A—
(a) the erection within the curtilage of a dwellinghouse of any building with a cubic content greater than 10 cubic metres shall be treated as the enlargement of the dwellinghouse for all purposes including calculating cubic content where—
(i) the dwellinghouse is on article 1(5) land, or
(ii) in any other case, any part of that building is within 5 metres of any part of the dwellinghouse;
(b) where any part of the dwellinghouse would be within 5 metres of an existing building within the same curtilage, that building shall be treated as forming part of the resulting building for the purpose of calculating the cubic content.

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Source: https://www.legislation.gov.uk/uksi/1988/1813/schedule/2/part/1/chapter/1/paragraph/A.3 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-development-order-1988/schedule-2/part-1/chapter-1/paragraph-A.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.