301. Completion certificate and permission to occupy or use.

(i) erects or re-erects any buildings; or
(ii) makes any material external alteration in or addition to any existing building; or
(iii) constructs or re-constructs any projecting portion of a building which the Commissioner is empowered under Section 305 require to be set back or is empowered to give permission to construct or re-construct;
(a) give permission for the occupation of the building erected or for the use of the part of the building re-erected: or
(b) refuse such permission in case such erection, construction or re-construction is in contravention of any provision of this Act or any rule or bye-law made thereunder or any other enactment for the time being in force.
(a) until the permission referred to in clause (a) of sub-section (3) has been granted in the manner prescribed by bye-laws;
(b) unless the Commissioner has failed for fifteen days after the receipt of notice of completion to intimate his refusal to grant the said permission.