No building, structure or sign in any district, including special use districts, shall be erected, added to or moved or structurally altered until the Code Enforcement Officer has issued a zoning permit. No zoning permit shall be issued unless and until the proposed construction, addition, alteration or use thereof is in full conformity with all the provisions of this chapter or any applicable law. Any zoning permit issued in violation of the provisions of this chapter shall be null and void and of no effect, and any work undertaken or use established pursuant to any such permit shall be unlawful.