IA SF592

Counties and cities must allow at least one accessory dwelling unit (ADU) on the same lot as a single-family residence, with ADUs limited to 1,000 square feet or 50% of the main residence size, whichever is larger

Local governments cannot impose placement, appearance, parking, or architectural requirements on ADUs that are more restrictive than those for single-family residences, including prohibitions on requiring ADUs to match the main home's exterior design or roof pitch

ADU occupancy restrictions are prohibited, including requirements that property owners live on-site, that occupants have familial/marital/employment relationships, or income/age-based restrictions

Manufactured or mobile homes used as ADUs must be placed on permanent foundations and assessed for real estate taxes

ADU permit applications meeting state requirements must be approved without discretionary review or public hearing, using the same timeline as single-family residence approvals; any denial must include written reasons and remedies for approval