Clinton adopts ADU rules tightening foundations and adding site‑plan review; council votes unanimously

Aug 25, 2026

The council unanimously approved ordinance 26-02Z amending ADU standards to require preliminary site-plan review for detached ADUs, require permanent foundations for tiny homes used as ADUs, and count other rear-yard impervious surfaces toward a 25% cap to limit runoff.

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The Clinton City Council voted unanimously to adopt ordinance 26-02Z, which updates accessory dwelling unit (ADU) standards. Senior planner Keaton Jones told the council the changes add a preliminary site-plan review for detached ADUs, require proper foundations for ADUs so that tiny homes on wheels do not qualify unless permanently affixed and built to residential code, and clarify a 25% rear-yard impervious-surface limit that now counts patios and driveways. "This did go through, several reviews of the planning commission. Ultimately, they did recommend approval," Keaton said.

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