ADU Rules in Iowa (2026)
ADU rules in Iowa — no statewide ADU law. Regulation is entirely local. Key provisions and city-specific frameworks for accessory dwelling units.
Law Name
Preempts Local Ordinances
No — local rules may be stricter
Has State Law
No — regulation is local
Statewide Preemption Status Unconfirmed
No statewide preemption statute was confirmed for this jurisdiction — regulation is local. Local governments retain full authority to set their own rules.
Local Control Framework
Iowa does not have a statewide ADU law as of 2026 · Source
ADU regulation is left entirely to local municipalities · Source
Iowa Code Chapter 414 (City Zoning) grants municipalities authority over local zoning and land use · Source
Des Moines, Iowa City, Cedar Rapids, and Davenport set their own local ADU ordinances · Source
Iowa has been discussing housing supply initiatives but statewide ADU mandates had not been enacted as of 2026 · Source
Iowa City has historically been more progressive on housing density, with ADU-friendly local provisions · Source
Source: Iowa Local Zoning Authority. Last verified April 5, 2026. View source