Accessory Structures in Sauk County, WI (2026)
4 rules for unincorporated Sauk County, Wisconsin.
Verified from official government sources
ADU Rules
Unincorporated Sauk County does not zone a stand-alone accessory dwelling unit; Section 7.059 instead permits a temporary secondary dwelling of 400 to 800 square feet for a dependency living arrangement or farm use, sized, sited, and conditioned by the Zoning Administrator and Board of Adjustment.
Sauk County ADU Zoning Standards
Some RestrictionsSauk County Code § 7.059(3)(a), (c)-(e)
(3)Provisions. All temporary secondary dwellings must meet the following:(a)A temporary secondary dwelling shall only be established provided the following conditions are met:1.Converting existing living area, attic, basement or garage.2.Adding floor area to the existing dwelling.3.Constructing a detached temporary secondary dwelling on a site with an existing dwelling. ... (c)The size of the t...
ADU Impact Fees
Sauk County does not charge an ADU impact fee; instead, Section 7.059 requires the owner of an approved temporary secondary dwelling to pay a recurring inspection fee to the Zoning Administrator every three years, alongside a renewed affidavit confirming the unit is still needed.
Sauk County Secondary Dwelling Inspection Fee
Light RestrictionsSauk County Code § 7.059(2), (7)
(2)Confirmation of need for conditional use. An affidavit confirming the need for continuing the temporary secondary dwelling shall be provided to the Zoning Administrator every three years. ... (7)Inspection fee. An inspection fee shall be established by the agency and shall be payable to the Zoning Administrator every three years by June 1 of the third year.
ADU Rental Restrictions
Sauk County's temporary secondary dwelling permit is not a rental license: Section 7.059 issues it only to the property owner, bars its transfer, and limits occupancy to a dependent, caretaker, or qualifying farm household member rather than a paying tenant on the open market.
Sauk County Secondary Dwelling Occupancy Limits
Significant RestrictionsSauk County Code § 7.059(1), (3)(h)
(1)Conditional use, land use permit, and notice of temporary permit. The arrangement shall require the issuance of a land use permit in conjunction with the recording of a notice of temporary permit on a form acceptable to the Zoning Administrator with the Sauk County Register of Deeds. ... The land use permit ... under this section shall be issued to the owner of the property and is not transf...
Shed & Carport Rules
In the Single Family Residential district, Sauk County caps a shed or other principal accessory structure's floor area based on lot size: 600 square feet on lots under 20,000 square feet, 900 square feet up to 43,559 square feet, and 1,200 square feet on larger lots. A second, secondary accessory structure is capped at 120 square feet under Section 7.075.
Sauk County Shed Size and Setback Limits
Some RestrictionsSauk County Code § 7.075(1)-(2)
(1)Accessory structure number and floor area. Accessory structures in the Single Family Residential District shall comply with all building setback requirements and be limited to one principal accessory structure and one secondary accessory structure per lot. The dimensional standards for the principal accessory structure shall be as follows: Lot Area (sq. feet) Maximum Floor Area (sq. feet) (a...
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