# The Town and Country Planning (General Permitted Development) (England) Order 2015, Paragraph I.1: Development not permitted


Development described in Class I(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/2015/596/schedule/2/part/7/crossheading/class-i-developments-relating-to-an-industrial-process/paragraph/I.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-permitted-development-england-order-2015/schedule-2/part-7/crossheading-class-i-developments-relating-to-an-industrial-process/paragraph-I.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.