Can you build a PSL Modular unit in Iowa?

Yes. SF 592, signed in May 2025 and effective July 1, 2025, requires Iowa cities and counties to allow at least one ADU on a single-family lot — making Iowa the 14th state to legalize ADUs statewide. An ADU may be up to 1,000 sq ft or 50% of the primary dwelling (whichever is larger), and local governments can't impose design, setback, height, or lot-coverage standards more restrictive than those for the primary home. Confirm your city's implementing rules, but rely on the statewide floor.

Iowa's State Building Code Commissioner, within the Department of Inspections, Appeals & Licensing. A third-party agency handles plan/design approval, plant-facilities approval, and continuing in-plant inspection; a Certificate of Compliance is filed; and a seal issued by the Building Code Commissioner is attached to the unit. With the seal, your local jurisdiction permits the site work without re-reviewing the structure.

Yes — Des Moines offers a 10-year tax abatement on the value an ADU adds to your property, on top of the statewide allowance. Des Moines permits one ADU per lot (internal or detached in the rear yard), capped at 50% of the primary home or 1,000 sq ft (whichever is larger). Cedar Rapids, Iowa City, and Ames have their own ADU ordinances.

Cold, snow, and wind. Iowa winters demand a high-performance thermal envelope and snow-rated roofs, and the state sees significant tornado/high-wind activity, so the structure is engineered to the design wind speeds. Seismic risk is low. PSL Modular sets the envelope and wind spec from your site coordinates.

Yes. Rural and small-town housing shortages plus ag/manufacturing workforce demand suit modular, and the new statewide ADU right plus Des Moines's abatement make backyard units compelling in the metros. The sealed unit clears the building; your work is the site and (now lighter) local zoning.