# The Town and Country Planning (General Permitted Development) Order 1995, Paragraph A.1: Development not permitted


Development is not permitted by Class A if—
(a) the gross floor space of the original building would be exceeded by more than—
(i) 25%; or
(ii) 50 square metres,
whichever is the lesser;
(b) the height of the building as extended would exceed—
(i) if within 10 metres of a boundary of the curtilage of the premises, 5 metres; or
(ii) in all other cases, the height of the building being extended;
(c) any part of the development would be within 5 metres of any boundary of the curtilage of the premises;
(d) the development would be on article 1(5) land;
(e) the development would be on land within a World Heritage Site;
(f) the development would be within the curtilage of a listed building; or
(g) the development would lead to a reduction in the space available for the parking or turning of vehicles.

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Source: https://www.legislation.gov.uk/uksi/1995/418/schedule/2/part/41n1/paragraph/A.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-permitted-development-order-1995/schedule-2/part-41n1/paragraph-A.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.