ADU rules in Rock County, WI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Wisconsin has no statewide ADU mandate. Rock County only zones consenting unincorporated towns under Wis. Stat. 59.69; inside Janesville, Beloit and villages, ADU rules are municipal. Confirm with your town or city before adding an in-law unit.
Wisconsin land use is split: cities (Janesville, Beloit) and villages zone inside their limits, while the county zones unincorporated TOWNS that have adopted county zoning under Wis. Stat. 59.69. There is no statewide ADU statute; the Uniform Dwelling Code sets baseline dwelling definitions and each municipality builds its own ADU rules. Size, setback and permit standards vary town to town. Where county zoning applies, an ADU is treated as a second dwelling unit and must meet the district's lot-size, setback and height standards. Check your specific town's zoning ordinance or the Rock County Planning, Economic & Community Development office before building.
Building a second dwelling unit without required zoning approval can trigger a stop-work order and daily zoning forfeitures set by the town or county ordinance.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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