# The Town and Country Planning (General Permitted Development) Order 1995, Paragraph C.4: Conditions


(1) Class C(a) and Class C(c) development is permitted subject to the condition that any antenna or supporting apparatus, radio equipment housing or development ancillary to radio equipment housing constructed, installed, altered or replaced on a building in accordance with that permission must, so far as is practicable, be sited so as to minimise its effect on the external appearance of the building.
(2) Class C(a) development consisting of the installation of any additional apparatus on article 1(5) land is permitted subject to the condition that the apparatus must be installed as close as is reasonably practicable to any existing apparatus.
(3) Class C(b) development is permitted subject to the condition that any apparatus or structure provided in accordance with that permission must, at the expiry of the relevant period be removed from the land and the land restored to its condition before the development took place.
(4) Class C development—
(a) on article 1(5) land or land which is, or is within, a site of special scientific interest; or
(b) on any other land and consisting of the construction, installation, alteration or replacement of a mast; or of an antenna on a building or structure (other than a mast) where the antenna (including any supporting structure) would exceed the height of the building or structure at the point where it is installed or to be installed by 4 metres or more; or of radio equipment housing with a volume in excess of 2.5 cubic metres; or of development ancillary to radio equipment housing—
is permitted subject, except in case of emergency, to the conditions set out in C.5.

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Source: https://www.legislation.gov.uk/uksi/1995/418/schedule/2/part/38/chapter/3/paragraph/C.4 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-permitted-development-order-1995/schedule-2/part-38/chapter-3/paragraph-C.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.