The Town and Country Planning (General Permitted Development) (England) Order 2015 No. 596

SCHEDULE 2 E+W Permitted development rights

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

Class E – development on operational Crown land relating to an airbase E+W

Interpretation of Class E E+W

E.3  For the purposes of paragraph E.1, floor space is calculated by external measurement and without taking account of the floor space in any pier or satellite.