Waukesha County, WI Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Waukesha County, WI, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Max accessory buildings
- Two per lot
- Footprint, lot <14,000 sq ft
- 600 sq ft total
- Footprint, larger lots
- 750 sq ft or 2% of lot
- Small shed side offset
- 5 ft if under 200 sq ft
- Distance from house
- At least 10 ft
Summary
In unincorporated Waukesha County towns, a lot is limited to two accessory buildings and a total footprint of 600 sq ft (lots under 14,000 sq ft) or 750 sq ft / 2% of lot area on larger lots. One detached shed under 200 sq ft may sit 5 ft from
One detached accessory Building on any Lot which is less than two hundred (200) square feet in area may be located five (5) feet to the Side Lot Line unless otherwise excepted under any other provision.
Official source re-checked September 8, 2026: the cited page had not changed since it was quoted.
Full Breakdown
Under the County Basic Zoning Ordinance (Sec. 3.11(4)), the combined footprint of all accessory buildings is capped by lot size: 600 sq ft on lots under 14,000 sq ft, and 750 sq ft or 2% of lot area (whichever is greater) on larger lots. Sec. 3.11(4)(E) limits a lot to two accessory buildings absent Plan Commission approval. For placement, Sec. 3.09(3)(A)4 lets one detached accessory building under 200 sq ft be set 5 ft from a side lot line, and Sec. 3.09(5) requires any detached accessory building to be at least 10 ft from the principal building. Cities and villages set their own shed rules.
Violations & Fines
Building or placing a shed without required zoning approval, or exceeding footprint/number limits, can trigger a stop-work or removal order and daily zoning forfeitures enforced by Parks and Land Use.
Frequently Asked Questions
How many sheds can I have on my lot?
How close to the property line can a small shed go?
Sources & Official References
Other rules in Waukesha County
How Waukesha County compares: Shed Permit Requirements by City·Compare Waukesha County to another location·View the Wisconsin accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.