Permits shall be granted or refused within 10 days after the written application has been filed with the Zoning Officer. Upon completion of the erection or alteration of any building or portion thereof authorized by any permit, and prior to occupancy or use, the holder of such permit shall notify the Zoning Officer of such completion. No permit shall be considered complete or permanently effective until the Zoning Officer has certified that the work has been inspected and approved as being in conformity with the provisions of this chapter and other applicable provisions of this revision and has issued a certificate of occupancy as required below.