No building or other structure shall be erected, constructed, enlarged, altered, nor shall the use of any land or building or other structure be changed without a zoning clearance permit being issued authorizing such construction, alteration, or use changes as being in compliance with the provisions of this chapter, except that no zoning clearance permit shall be required for usual farm buildings within an A District for agricultural purposes. No building or other permit shall be issued for any construction not conforming to a valid zoning clearance permit.