ABSTRACT
Permitted development A.—The enlargement, improvement or other alteration of a dwellinghouse.
Development not permitted A.1-Development is not permitted by Class A if-(a) the cubic content of the resulting building would exceed the cubic content
of the original dwellinghouse-(i) in the case of a terrace house or in the case of a dwellinghouse on
article 1(5) land, by more than 50 cubic metres or 10 %, whichever is the greater,
(ii) in any other case, by more than 70 cubic metres or 15%, whichever is the greater,
(iii)in any case, by more than 115 cubic metres; (b) the part of the building enlarged, improved or altered would exceed in
height the highest part of the roof of the original dwellinghouse; (c) the part of the building enlarged, improved or altered would be nearer to
any highway which bounds the curtilage of the dwellinghouse than-(i) the part of the original dwellinghouse nearest to that highway, or
(ii) any point 20 metres from that highway,
whichever is nearer to the highway; (d) in the case of development other than the insertion, enlargement,
improvement or other alteration of a window in an existing wall of a dwellinghouse, the part of the building enlarged, improved or altered would be within 2 metres of the boundary of the curtilage of the dwellinghouse and would exceed 4 metres in height;
(e) the total area of ground covered by buildings within the curtilage (other than the original dwellinghouse) would exceed 50% of the total area of the curtilage (excluding the ground area of the original dwellinghouse);
(f) it would consist of or include the installation, alteration or replacement of a satellite antenna;
(g) it would consist of or include the erection of a building within the curtilage of a listed building; or
(h) it would consist of or include an alteration to any part of the roof.
