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


Development is not permitted by Class A(a) if—
(a) in the case of the installation of apparatus (other than on a building or other structure) the apparatus would exceed a height of 15 metres above ground level;
(b) in the case of the alteration or replacement of apparatus already installed (other than on a building or other structure), the apparatus would when altered or replaced exceed the height of the existing apparatus or a height of 15 metres above ground level, whichever is the greater;
(c) in the case of the installation, alteration or replacement of apparatus on a building or other structure, the height of the apparatus (taken by itself) would exceed—
(i) 15 metres, where it is installed, or is to be installed, on a building or other structure which is 30 metres or more in height; or
(ii) 10 metres in any other case;
(d) in the case of the installation, alteration or replacement of apparatus on a building or other structure, the highest part of the apparatus when installed, altered or replaced would exceed the height of the highest part of the building or structure by more than—
(i) 10 metres, in the case of a building or structure which is 30 metres or more in height;
(ii) 8 metres, in the case of a building or structure which is more than 15 metres but less than 30 metres in height;
(iii) 6 metres in any other case;
(e) in the case of the installation or replacement of any apparatus other than—
(i) a mast,
(ii) any kind of antenna,
(iii) a public call box, or
(iv) any apparatus which does not project above the level of the surface of the ground,
the ground or base area of the structure would exceed 1.5 square metres;
(f) in the case of the installation, alteration or replacement on a building or structure of a microwave antenna or apparatus which includes or is intended for the support of such an antenna—
(i) the building or other structure on which the antenna is to be installed is less than 15 metres in height;
(ii) the size of the antenna when measured in any dimension would exceed 1.3 metres (excluding any projecting feed element); or
(iii) the development would result in the presence on the building or structure of more than two microwave antennas; or
(g) in the case of development on any article 1(5) land, it would consist of—
(i) the installation or alteration of a microwave antenna or of any apparatus which includes or is intended for the support of such an antenna; or
(ii) the replacement of such an antenna or such apparatus by an antenna or apparatus which differs from that which is being replaced,
unless the development is carried out in any emergency.

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Source: https://www.legislation.gov.uk/uksi/1988/1813/schedule/2/part/24/chapter/1/paragraph/A.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-development-order-1988/schedule-2/part-24/chapter-1/paragraph-A.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.