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


Development described in Class B(a) is not permitted if—
(a) it would materially affect the external appearance of the premises of the undertaking concerned, or
(b) any plant or machinery would exceed a height of 15 metres above ground level or the height of anything replaced, whichever is the greater.

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Source: https://www.legislation.gov.uk/uksi/1988/1813/schedule/2/part/8/chapter/2/paragraph/B.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-development-order-1988/schedule-2/part-8/chapter-2/paragraph-B.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.