All work performed under a permit issued hereunder shall conform to the approved application and plans, and any approved amendments thereto. It shall be unlawful for any owner, agent, architect, structural engineer, contractor or builder engaged in erecting, altering or repairing any building to make any departure from the drawings or plans as approved by the Building Commissioner, of a nature which involves any violation of the provisions of this Chapter on which the permit has been issued. Any such departure from the approved drawings or plans involving a violation of requirements shall operate to annul the permit which has been issued for such work and shall render the same void.