Application. Except as specified in Section 13-1-103, no signs, billboards, awnings or canopies shall hereafter be located, erected, moved, reconstructed, extended, enlarged, converted or structurally altered without a sign permit and without being in conformity with the provisions of this Article. Signs shall not be erected or altered until a permit has been reviewed and approved by the Zoning Administrator/Building Inspector. "Altered" shall be defined as any modification in the size, height, dimensions, location or mounting of a sign other than routine maintenance.