Erection or re-erection of buildings in controlled areas.

Except as provided hereinai1er, no person shall erect or rc-erect building or make or extend any excavation or lay out any means of aaess to a road in a conrrolled area save in-accordance with the plans and the restrjctions and conditions referred to in section 5 and with the previous permission of the Director : Provided that no such permission shall k necessary for erection or re- ecti on of any building if suc h building is used or is to k used for agriculmal purposes or purposes subservient to agriculture.