(a) the work mentioned in the development and building permit shall be commenced within six months from the date of issue of the development and building permit;

(b) the work mentioned in the development and building permit shall not be discontinued or suspended for a period in excess of one year; and

(c) the work mentioned in the development and building permit shall be carried out, unless otherwise approved by the development officer or building inspector, as the case may be, in compliance with the specifications contained in the application for the development and building permit.