SCHEDULES
SCHEDULE 3 Development Not Constituting New Development
Part III Supplementary Provisions
10
(1)
Any reference in this Schedule to the cubic content of a building shall be construed as a reference to that content as ascertained by external measurement.
(2)
For the purposes of F1paragraph 1 the cubic content of a building is substantially increased or exceeded—
(a)
in the case of a dwellinghouse, if it is increased or exceeded by more than one-tenth or 1,750 cubic feet, whichever is the greater; and
(b)
in any other case, if it is increased or exceeded by more than one-tenth.