ADUs are allowed in New Berlin CityTypes:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for New Berlin City, WI
Is your property eligible for an ADU?
# of Parcels
15,647
Zoning districts
32
Median Parcel Size
0.55 acres
Zoning Districts:
15,808 parcels · 32 districts
R-5
36%(5,723)
R-4
20%(3,228)
RM-1
10%(1,550)
R-1/R-2
9%(1,407)
Other
25%(3,900)
ADU Rules
What can you build in New Berlin City, WI?
New Berlin City, 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: Not permitted
Interior / Attached ADU Size Limits
- –Maximum size of 50% of the principal dwelling’s living space in single-family districts (also applies to agricultural districts).
Max Units
- –0 per lot for detached ADUs (prohibited)
Owner Occupancy
- –Owner must reside on the property in either unit
Parking
- –No ADU-specific minimum; no explicit ADU maximum; citywide max is 15% above the required amount (based on 2 spaces/dwelling for listed uses); reductions possible near mass transit or with shared parking
Rental Restrictions
- –Detached ADUs are not permitted to be rented; internal/attached ADUs may only be used as family dwellings and renting to unrelated tenants is prohibited; short-term rentals under 7 days are prohibited, and 7–29 day rentals may be limited to 181 days per year (with City Clerk notice).
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.
Waukesha County