Development not permitted: ground or base area
(4) Development is not permitted by Class A(a) if, in the case of the installation, alteration or replacement of any apparatus other than—
(a)a mast;
(b)an antenna;
(c)a public call box;
(d)any apparatus which does not project above the level of the surface of the ground; or
(e)radio equipment housing,
the ground or base area of the structure would exceed 1.5 square metres.