This chapter shall apply to the construction, nature and extent of the use of all buildings and to the nature and extent of the use of all land. Except as previously or hereinafter provided, no building, structure or land, or any part thereof, shall be used or occupied, and no building or structure shall be erected, constructed, relocated, repaired, enlarged, converted or structurally altered, unless in conformity with all of the regulations of this chapter specified for the district in which it is located.