Building permits, zoning and land rules in Pierce County, Wisconsin

Yes, in unincorporated Pierce County. Constructing, reconstructing, placing or altering a structure at least 6 inches above ground, including a temporary structure, requires a county land-use permit¹. An easily moved structure under 100 square feet is exempt from the permit but must still meet setbacks¹.

A new one- or two-family home needs a second permit under the Wisconsin Uniform Dwelling Code, whether it is stick-built, modular or a manufactured-home installation⁴. A municipality with delegated authority may issue it; otherwise the application goes to the state Department of Safety and Professional Services (DSPS), with plans, contractor license information and an application fee⁴. The county land-use permit and the UDC permit are separate approvals. An owner who lives, or will live, in the home may apply for the UDC permit as owner-occupant, but that does not waive other required permits or inspections⁵.

The county's permit steps stop at city limits. Inside Prescott, the city issues building permits for new buildings, additions and alterations³.

Pierce County Land Management / Zoning issues land-use and sanitary permits and administers the floodplain, shoreland, wetland, subdivision and St. Croix Riverway ordinances¹. The office is in the courthouse basement, Room 10, at 414 W. Main St. in Ellsworth; call 715.273.6746 or email land.mgmt@co.pierce.wi.us, and staff will tell you whether your location, use and size need a permit¹.

Land-use applications go to the Zoning Administrator on county forms. They need owner and property information, proof of ownership, a plot plan, access and driveway information, and evidence of safe water and approved sewage disposal⁹. The county does not accept an application until it is complete and the fees are paid; the fee is set by the Pierce County Board of Supervisors, and the county code does not state a dollar amount, so ask the office for the current schedule⁹. A land-use permit generally expires after 12 months, with renewal possible once construction has started⁹.

For the UDC permit, notify the inspector named on the permit when work is ready for footings, foundation and reinforcement, rough work, insulation and the final inspection⁴. That inspector may be municipal, county or state-authorized depending on delegation, and we could not confirm a single inspector for every parcel⁴.

Yes. The Pierce County zoning ordinance applies to all unincorporated areas except the Town of River Falls, which has its own ordinance, and shoreland regulations apply in every unincorporated area². The county code divides unincorporated land into zoning districts, and shoreland, floodplain, Riverway and subdivision rules can add further review¹⁰. Incorporated municipalities such as Prescott can run their own rules inside their limits; septic permits stay with the county either way^1,2.

Minimum lot size for a new parcel depends on the town: 1 acre in towns such as Hartland, Martell and Trenton, 2 acres in El Paso, Gilman and Spring Lake, 2.5 acres in Ellsworth and Trimbelle, and 3 acres in Clifton and Oak Grove¹¹. Older lots may still qualify as building sites at 10,000 square feet without public sewer or 5,000 with it¹¹.

In St. Croix Riverway areas, structures must sit 200 feet from the ordinary high-water mark and 100 feet from the bluff line². Elsewhere in shoreland areas, Wisconsin generally requires buildings to stay at least 75 feet from the ordinary high-water mark¹². We could not confirm ordinary setback distances, lot coverage or building height; Land Management / Zoning can give the figures for a parcel's district².

The only minimum dwelling size we found is 550 square feet for manufactured homes in manufactured-home parks⁶.

Pierce County Land Management / Zoning issues sanitary permits for septic¹. A sanitary permit is needed before permitting and construction of a new dwelling or principal structure, and also when a bathroom or running water is added to a new or existing accessory structure¹. The county will not issue a land-use permit for a structure people will occupy without documentation of safe and adequate water supply and sewage disposal, so septic design comes first⁹.

After a system is built, the county requires an inspection before backfilling; following notice from the plumber, the inspection must happen by the end of the next workday, excluding weekends and holidays¹³. Wisconsin also requires a visual inspection of privately owned wastewater systems at least once every 3 years¹⁴. Only 10.9% of mapped soils in Pierce County rate as not limited for a conventional drain field, so make a soil evaluation an early purchase contingency and expect a possible engineered system¹⁵.

The county rule we found covers RVs only in approved campgrounds: one recreational vehicle per campsite, occupied no more than eight months in a calendar year, with wheels and tires left in transit position⁷. We could not confirm a rule for full-time RV living or camping on a private homesite, or for tiny-home occupancy. Ask Pierce County Land Management / Zoning, and the town or city if the parcel is not in county-zoned territory, before buying or placing a unit¹.

A small or temporary unit is not automatically permit-free: any structure at least 6 inches above ground needs a county land-use permit unless it is easily moved and under 100 square feet¹. A manufactured-home installation needs a UDC permit⁴. A privy is allowed with a sanitary permit if it meets county construction, siting, servicing and venting rules¹³.

1. Confirm who zones the parcel: county zoning, the Town of River Falls, or an incorporated city².
2. Call Land Management / Zoning to confirm the district, lot size and any shoreland, floodplain or Riverway limits^1,10.
3. Make sure the lot has access to a public road or a private road recorded with the Pierce County Register of Deeds¹⁶.
4. Get the septic design and the county sanitary permit before dwelling permitting¹.
5. Submit the land-use application with a plot plan and proof of water and sewage disposal, and pay the fee⁹.
6. Apply for the Wisconsin UDC permit through the delegated municipality or DSPS⁴.
7. Call for the footing, foundation, rough, insulation and final inspections⁴.

Start with jurisdiction and district, then floodplain: development in floodplain zoning needs approvals from the county and the municipality with authority¹⁷. Check the parcel against shoreland, Riverway and subdivision rules that can shrink the buildable area¹⁰.

Verify road access: no lot may be created or building placed on a lot without access to a public road or a recorded private road, and the owner is responsible for securing that access¹⁶. A connection to a state highway requires a WisDOT permit¹⁸. Treat septic suitability as a contingency because only 10.9% of mapped soils avoid severe conventional drain-field limits¹⁵. For a new non-high-capacity private well, Wisconsin requires a Well Construction Notification Number before drilling⁸.