Development is not permitted by Class B(a) if—
(a)the height of any building would be increased;
(b)the cubic content of the original building would be increased by more than 10%;
(c)any part of any new building would be more than 30 metres from the original building;
(d)the development would involve the extension, alteration or provision of a dwelling;
(e)any part of the development would be carried out within 5 metres of any boundary of the unit; or
(f)the ground area of any building extended by virtue of Class B(a) would exceed 465 square metres.