Compliance. No building, structure, or land shall hereafter be used or occupied, and no building or structure or part thereof shall hereafter be erected, constructed, reconstructed, moved, or structurally altered except in conformity with all applicable provisions of this chapter. No changes shall be made in the contour of the land; no grading, excavation, removal or destruction of topsoil, trees or other vegetative cover of land shall be commenced until the zoning certificate has been issued in compliance with the terms of this chapter.