# The Town and Country Planning (General Permitted Development) Order 1995, 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/1995/418/schedule/2/part/8/paragraph/B.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-permitted-development-order-1995/schedule-2/part-8/paragraph-B.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.