# The Town and Country Planning General Development Order 1988, Paragraph D.1: Development not permitted


Development is not permitted by Class D if—
(a) the ground area (measured externally) of the structure would exceed 3 square metres;
(b) any part of the structure would be more than 3 metres above ground level; or
(c) any part of the structure would be within 2 metres of any boundary of the curtilage of the dwellinghouse with a highway.

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Source: https://www.legislation.gov.uk/uksi/1988/1813/schedule/2/part/1/chapter/4/paragraph/D.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-development-order-1988/schedule-2/part-1/chapter-4/paragraph-D.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.