Des Moines allows ADUs in its neighborhood districts under Municipal Code Chapter 134, with building, electrical, plumbing, and mechanical permits through Development Services. Since July 1, 2025, Iowa Code section 364.3(23) (SF 592) requires the city to allow one ADU per single-family lot and approve complying applications without a hearing.
Des Moines Municipal Code Chapter 134 permits ADUs by right in the N1 through N4 neighborhood districts - detached, attached, or interior conversions, one per lot. State law now sets a floor: Iowa Code section 364.3(23), added by Senate File 592 effective July 1, 2025, requires the city to allow an ADU up to 1,000 square feet or 50 percent of the primary dwelling, whichever is larger, so the old 800-square-foot local cap can no longer be enforced below that. The city also cannot demand owner-occupancy, extra parking, or stricter design standards than the main house. Permits (building, electrical, plumbing, mechanical) file through the Citizen Self Service portal at Development Services. Historic districts still require Landmark Review Board approval.
Unpermitted ADU construction violates Chapter 134 with civil penalties up to $750 per day per violation under Chapter 60 (Municipal Infractions). Development Services may issue stop-work orders and demolition orders for unsafe structures. The City may seek injunctive relief in Polk County District Court. Liens may attach to the property for unpaid fines and corrective work. Iowa Code 364.22 governs municipal infraction enforcement.
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