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


Development is not permitted by Class G if—
(a) in the case of any Class G(b) development involving the installation of a chamber for housing apparatus exceeding 29 cubic metres in capacity, that installation would be carried out at or above ground level, or under a highway used by vehicular traffic;
(b) in the case of any Class G(e) development—
(i) the height of the original building would be exceeded,
(ii) the cubic content of the original building would be exceeded by more than 25% (or 10% in the case of any building on article 1(5) land), or
(iii) the floorspace of the original building would be exceeded by more than 1000 square metres (or 500 square metres in the case of any building on article 1(5) land);
(c) in the case of any Class G(f) development, the building would exceed 15 metres in height, or
(d) in the case of any Class G(g) development, it would consist of or include—
(i) the erection of a building, or the reconstruction or alteration of a building where its design or external appearance would be materially affected, or
(ii) the installation or erection by way of addition or replacement of any plant or machinery exceeding 15 metres in height or the height of any plant or machinery replaced, whichever is the greater.

---
Source: https://www.legislation.gov.uk/uksi/1988/1813/schedule/2/part/17/chapter/7/paragraph/G.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-development-order-1988/schedule-2/part-17/chapter-7/paragraph-G.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.