# The Town and Country Planning (General Permitted Development) (Scotland) Order 1992, Paragraph 9D


(1) The extension or alteration of an office building.
(2) Development is not permitted by this class 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 altered or extended would exceed 4 metres;
(c) any part of the development would be within 10 metres of any boundary of the curtilage of the premises;
(d) the development would result in a reduction in the space available for the parking or turning of vehicles; ...
(e) the development would consist of or include the construction or provision of a veranda, balcony or raised platform;
(f) it would be development described in class 7A(1)
(3) Development is not permitted by this class in the case of land within—
(a) a site of archaeological interest;
(b) a national scenic area;
(c) a historic garden or designed landscape;
(d) a historic battlefield;
(e) a conservation area;
(f) a National Park; or
(g) a World Heritage Site.
(4) For the purposes of this class—
(a) any reference to height is a reference to height when measured from ground level and ground level means the level of the surface of the ground immediately adjacent to the building or structure or, where the level of the ground is not uniform, the level of the lowest part of the surface of the ground adjacent to it; and
(b) “raised platform” means a platform with a height greater than 300 millimetres; ...
...

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Source: https://www.legislation.gov.uk/uksi/1992/223/schedule/1/class/9d (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-permitted-development-scotland-order-1992/schedule-1/class/9d
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.