After the effective date of this chapter, except for existing legal nonconforming uses or structures, no structure or building shall be erected, reconstructed, structurally altered, enlarged or moved, and no structure, building or land shall be used, occupied or designed to be used, unless in conformity with the regulations specified herein for the zoning district in which it is located and with all other applicable provisions of this chapter, and then only after applying for and securing all permits, licenses and approvals required by all laws, ordinances, resolutions, regulations and codes.