b. Upon completion of the improvement covered by the building permit, the building inspector shall reveal that the improvement has been completed in substantial conformity with the site plans, shall issue a certificate of occupancy. c. No change shall be made in the use of land or in the use of any building or part hereof, now or hereafter erected, reconstructed, or structurally altered, without a certificate of occupancy having been issued by the building inspector, and no such permit shall be issued to make such change unless it is in conformity with the provisions of the ordinance.