Except as hereinafter provided, no Construction or Zoning Permit shall be issued for any building or use or structure, or reduction or enlargement in size or other alteration of any building or structure or change in use of any building including accessory structures and outdoor storage and sales areas unless a site plan is first submitted and approved by the Planning Board, and no certificate of occupancy shall be given unless all construction and development conforms to the plans as approved by the Planning Board.