How Wausau Handles Accessory Structures: A Practical Guide
Wausau maintains 127 local ordinances across all categories, and 3 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Wausau falls on the strict-to-permissive spectrum compared to other cities.
ADU Rules
Wausau allows accessory dwelling units on a single-family lot under Municipal Code § 23.03.28(6), capping occupancy at one family plus a roomer or two unrelated people and requiring the unit to meet the underlying district's setbacks. Front-facing entrances on the main building are off-limits.
Key details: Governing section: Wausau Municipal Code § 23.03.28(6). Occupancy cap: 1 family + 1 roomer, or 2 unrelated. Entrance rule: No new front-elevation entrances. Setbacks: Must meet underlying district's standards. Approval path: Conditional use permit per district table.
Building or converting an accessory dwelling unit without the required conditional use approval, exceeding the one-family-plus-roomer or two-unrelated-person occupancy cap, or adding a front-facing entrance to accommodate the unit are zoning violations the Department of Inspections and Zoning can enforce through a stop-work order or removal of the unauthorized entrance or occupancy.
ADU Owner Occupancy
An accessory dwelling unit sharing a lot with a single-family home in Wausau requires the principal building to be owner-occupied. Municipal Code § 23.03.28(6)(e) also bars selling the ADU separately and caps its size at 75 percent of the main home's floor area, up to 800 square feet.
Key details: Governing section: Wausau Municipal Code § 23.03.28(6)(e). Owner-occupancy: Principal building must be owner-occupied. Separate sale: Prohibited; ADU stays tied to main dwelling. Size cap: 75% of principal floor area, max 800 sq ft. Design match: Exterior finish, roof pitch, trim must match main house.
Renting out both the principal dwelling and the accessory dwelling unit without the owner residing on-site, attempting to sell the ADU as a separate parcel, or building an ADU that exceeds 75 percent of the principal dwelling's floor area or 800 square feet violates § 23.03.28(6)(e) and can be enforced by the Department of Inspections and Zoning through permit denial or revocation.
This is one of the stricter rules in Wausau's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.
Shed & Carport Rules
Sheds in Wausau are accessory structures under Title 23 of the Wausau Municipal Code. The City of Wausau Inspections, Zoning and Electrical Systems Division requires a building permit for any detached garage, lean-to, storage building, gazebo or similar accessory structure - including prefab sheds and buildings built off-site and placed on the lot. Permit applications are submitted through the city's Evolve Permit Portal and are reviewed by the Inspections Division at (715) 261-6780.
Key details: Code Title: Title 23 Zoning. Permit Required: Yes (all sheds). State Code: Wis. Stat. 62.23 / SPS 320-325. Permit Portal: Evolve Permit Portal. Inspections Phone: (715) 261-6780.
A shed installed without a required Wausau zoning or building permit, in the front yard, or inside the applicable side- or rear-yard setback violates Title 23 of the Wausau Municipal Code and is enforceable by the Inspections, Zoning and Electrical Systems Division. Typical responses include a stop-work order, an after-the-fact permit fee, or an order to relocate or remove the structure, with continued non-compliance referable to the City Attorney for forfeiture and abatement.
The Bottom Line
Wausau's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Wausau is broadly strict or permissive.
Keep in mind that Wausau can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.