ADU rules in Des Moines, IA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Des Moines expanded ADU allowances in 2022 and Iowa SF 592 further requires cities to permit ADUs. ADUs up to 1,000 sq ft or half the primary dwelling size are allowed. The city offers a 10-year tax abatement on ADU value.
Des Moines significantly expanded where ADUs are permitted in 2022, and Iowa Senate File 592 requires cities to allow ADUs on lots with single-family residences. ADUs may be up to 1,000 square feet or half the primary dwelling's size, whichever is larger. Only one ADU is allowed per lot. ADUs may be within the primary house (internal conversion) or in a detached accessory building. Detached ADUs must be located in the rear yard. The property owner must occupy either the primary dwelling or the ADU. Building permits are required. The city offers a 10-year property tax abatement on the assessed value added by the ADU, making construction more financially attractive. ADUs must meet all building code requirements for habitable spaces including egress, plumbing, and electrical.
Building without a permit: municipal infraction. Non-compliant ADUs may be required to be brought to code or removed. Occupancy violations possible.
Des Moines, IA
Des Moines has no city ordinance restricting lawn ornaments on residential property. Chapter 60 (Housing) requires reasonable property maintenance and could ...
Des Moines, IA
Des Moines has no city ordinance regulating residential inflatable holiday displays. Chapter 48 (Noise) standards could theoretically apply to overnight blow...
Des Moines, IA
Des Moines has no municipal ordinance regulating residential holiday lights. Display timing, brightness, and animation are governed primarily by HOA and cond...
Des Moines, IA
Des Moines requires building permits for permanent outdoor kitchen installations with gas lines, electrical wiring, plumbing, or structural roofs under Chapt...
Des Moines, IA
Des Moines has no smoker-specific ordinance. Open burning is regulated under Chapter 70 (Fire Prevention) and Iowa Code 100B with cooking-fire exemptions. Io...
Des Moines, IA
Des Moines Fire Code under Chapter 26, Article XII adopts the International Fire Code (IFC). IFC 308.1.4 prohibits open-flame cooking devices and LP-gas tank...
See how Des Moines's adu rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.