Development not permitted
D.1 Development is not permitted by Class D if—
(a)in the case of any Class D(a) development, it would include the construction of a reservoir;
(b)in the case of any Class D(f) development, it would consist of or include the extension or alteration of a building so that—
(i)its design or external appearance would be materially affected,
(ii)the height of the original building would be exceeded, or the cubic content of the original building would be exceeded by more than 25%, or
(iii)the floor space of the original building would be exceeded by more than 1,000 square metres; or
(c)in the case of any Class D(f) development, it would consist of the installation or erection of any plant or machinery exceeding 15 metres in height or the height of anything it replaces, whichever is the greater.
A body established under section 1 of the Environment Act 1995 (c. 25).