IA · State directory
Iowa ADU rules
Official accessory dwelling unit regulations for 20 jurisdictions in Iowa, plus statewide law.
Not sure which city yet?
We have read the ordinances for 20 Iowa cities and lined them up side by side: detached vs internal, size limits, owner occupancy, and approval process.
Statewide ADU law
Iowa has state-level ADU legislation that applies across local jurisdictions. Local rules below may add requirements on top of state law.
- legis.iowa.govOfficial sourceVerified October 2026https://www.legis.iowa.gov/docs/code/364.3.pdf
- legis.iowa.govOfficial sourceVerified October 2026https://www.legis.iowa.gov/docs/code/331.301.pdf
- legis.iowa.govOfficial sourceVerified October 2026https://www.legis.iowa.gov/docs/publications/LGE/91/SF592.pdf
- legis.iowa.govOfficial sourceVerified October 2026https://www.legis.iowa.gov/docs/publications/LGE/91/SF2369.pdf
Cities
Ames4 sources · verified October 2026Ankeny4 sources · verified October 2026Bettendorf3 sources · verified October 2026Cedar Falls3 sources · verified October 2026Cedar Rapids2 sources · verified October 2026Council Bluffs3 sources · verified October 2026Davenport2 sources · verified October 2026Des Moines3 sources · verified October 2026Dubuque2 sources · verified October 2026Iowa City4 sources · verified October 2026Marion3 sources · verified October 2026Marshalltown3 sources · verified October 2026Mason City2 sources · verified October 2026Sioux City3 sources · verified October 2026Urbandale2 sources · verified October 2026Waterloo3 sources · verified October 2026Waukee2 sources · verified October 2026West Des Moines3 sources · verified October 2026
Counties & regions
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