SCHEDULES
SCHEDULE 11 Development not constituting new development
4
For the purposes of paragraph 1 the cubic content of a building is substantially exceeded—
(a)
in the case of a dwellinghouse, if it is exceeded by more than one-tenth or 1,750 cubic feet, whichever is the greater, and
(b)
in any other case, if it is exceeded by more than one-tenth.