ADUs are allowed in Unincorporated DaneTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Dane, WI
Is your property eligible for an ADU?
# of Parcels
0
Zoning districts
86
Zoning Districts:
870 parcels · 86 districts
FP-35
22%(191)
PUD
16%(140)
A-1
8%(70)
AT-35
4%(36)
Other
50%(433)
ADU Rules
What can you build in Unincorporated Dane, WI?
Unincorporated Dane, WI follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Maximum size of 800 sq ft of occupiable floor area for an internal or attached accessory dwelling unit, per unit.
Detached ADU Size Limits
- –Maximum detached ADU occupiable floor area of 800 sq ft (countywide).
- –In SFR-08, SFR-1, SFR-2, TFR-08, and MFR-08, an accessory building’s footprint cannot exceed 100% of the principal building’s footprint; ADU floor area limited to that footprint times the ADU’s number of stories.
- –In SFR-08, SFR-1, SFR-2, TFR-08, and MFR-08, total building coverage is limited to 35% of lot area (40% on corner lots); ADU area is limited accordingly by its number of stories.
- –In HAM-R and HAM-M districts, total building footprint may not exceed 60% of lot area; ADU area is limited accordingly by its number of stories.
- –In LC district, total building footprint may not exceed 35% of lot area; ADU area is limited accordingly by its number of stories.
Owner Occupancy
- –Owner must occupy the premises, either in the ADU or principal dwelling.
Parking
- –1 space per ADU; no maximum; reductions up to 25% at the zoning administrator's discretion for lower demand, bicycle parking, transit proximity within 1,000 feet, or shared parking.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Wisconsin municipalities
Rules change at the town line. Check the municipality your property is actually in.
Dane County