ADU rules in Dane County, WI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
ADUs in unincorporated Dane County are permitted in appropriate zoning districts under Chapter 10. ADUs must be accessory to the principal dwelling and cannot be sold separately.
Dane County Chapter 10 permits accessory dwelling units in residential and some agricultural zoning districts. ADUs are permitted as an accessory use to the principal dwelling. They must remain on the same lot as the principal structure and cannot be subdivided or sold independently. Size and height standards are subordinate to the principal dwelling. A building permit and zoning compliance review are required. Dane County has been generally supportive of ADUs as part of county housing strategy.
ADUs built without permits or that violate zoning standards are subject to Dane County enforcement, including stop-work orders and fines.
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See how Dane County's adu rules rules stack up against other locations.
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