(a) All construction shall be performed in accordance with approved plans and specifications and shall not be changed, modified or altered without the express prior approval, when possible, of the person or entity which provided the original approvals, and the enforcement agency.

(b) The issuance or granting of a permit or approval of plans and specifications shall not be construed to be a permit for, or an approval of, any violation of the Health and Safety Code or any of the provisions of this chapter. Whenever an issued permit, or the work that it authorizes, violates provisions contained in this chapter, the Health and Safety Code, or any other provisions of applicable law, the permit, or that portion of the permit that authorizes the work in violation, shall be deemed null and void.

(c) The issuance of a permit based upon plans and specifications shall not prevent the enforcement agency from thereafter requiring the correction of errors in these plans and specifications, nor shall the issuance of a permit preclude the enforcement agency's power to prevent occupancy of a building, accessory building or structure, or building component, when it is found to be in violation of this chapter.