# The Town and Country Planning (General Permitted Development) (Scotland) Order 1992, Paragraph 4A


(1) Any improvement or other alteration to the external appearance of a dwelling situated within a building containing one or more flats.
(2) Development is not permitted by this class if—
(a) it would be an enlargement;
(b) it would protrude more than 1 metre from the outer surface of an external wall, roof plane, roof ridge or chimney;
(c) the dimensions of an existing window or door opening would be altered;
(d) it would be a balcony;
(e) it would be on the roof and would result in a raised platform or terrace;
(f) it would be a wind turbine;
(g) it would be within a conservation area or within the curtilage of a listed building; or
(h) it would be development described in class 6C(1), 6F(1) , 6H(1), 6HA(1), 6HB(1), 6HC(1), 7A(1) , 67(1) or 72(1).
(3) For the purposes of this class—
“balcony” means a platform, enclosed by a wall or balustrade, projecting outward from the external wall of a building, with access from an upper floor window or door;
“enlargement” means any development that increases the internal volume of the original building, and includes a canopy or roof, with or without walls, which is attached to the building but does not include a balcony;
a “window” or “door” includes its frame; and
the measurement of a dimension is a reference to the measurement of external dimensions.

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Source: https://www.legislation.gov.uk/uksi/1992/223/schedule/1/class/4a (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-permitted-development-scotland-order-1992/schedule-1/class/4a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.