Iowa Code § 335.24
If the regulations made under this chapter require a greater width or size of yards, courts, or other open spaces, or require a lower height of building or less number of stories, or require a greater percentage of lot to be left unoccupied, or impose other higher standards than are required in any other statute or local ordinance or regulation, the regulations made under this chapter govern. If any other statute or local ordinance or regulation requires a greater width or size of yards, courts, or other open spaces, or requires a lower height of building or a less number of stories, or a greater percentage of lot to be left unoccupied, or imposes other higher standards than are required by the regulations made under this chapter, the other statute or local ordinance or regulation governs. If a regulation proposed or made under this chapter relates to any structure, building, dam, obstruction, deposit, or excavation in or on the floodplains of any river or stream, prior approval of the department of natural resources is required to establish, amend, supplement, change, or modify the regulation or to grant any variation or exception from the regulation.
Iowa Code § 335.24
2003 Acts, ch 108, § 69