SCHEDULE 2E+WPermitted development rights

PART 19E+WDevelopment by the Crown or for national security purposes

Class B – extension or alteration of an operational Crown buildingE+W

Development not permittedE+W

B.1  Development is not permitted by Class B if—

(a)the building as extended or altered is to be used for purposes other than those of—

(i)the Crown; or

(ii)the provision of employee facilities;

(b)the height of the building as extended or altered would exceed the height of the original building;

(c)the cubic content of the original building would be exceeded by more than—

(i)10%, in respect of development on any article 2(3) land; or

(ii)25%, in any other case;

(d)the floor space of the original building would be exceeded by more than—

(i)500 square metres in respect of development on any article 2(3) land; or

(ii)1,000 square metres in any other case;

(e)the external appearance of the original building would be materially affected;

(f)any part of the building as extended or altered would be within 5 metres of any boundary of the curtilage of the original building; or

(g)the development would lead to a reduction in the space available for the parking or turning of vehicles.