Building permits, zoning and septic rules in Kewaunee County, Wisconsin

Wisconsin's Uniform Dwelling Code is the statewide building code for one- and two-family dwellings built since June 1, 1980, and it applies in Kewaunee County the same as everywhere else in the state¹⁰. Construction can begin only after plans are approved and the building permit is issued and posted, and at least two sets of plans must be submitted with the application^8,11. An owner who currently occupies, or will occupy, the finished home can take out the construction and erosion-control permits directly, without going through a state-certified Dwelling Contractor, though plumbing and electrical work still generally require licensed professionals⁸. Expect a $30 state permit-seal fee on top of whatever fee your municipality sets by ordinance¹¹.

Wisconsin's Uniform Dwelling Code is enforced by municipal or county building inspection departments, or by the state's Division of Industry Services where no local department has taken on that role⁸. The City of Kewaunee and the City of Algoma have delegated UDC authority through their municipalities¹². The Town of Ahnapee also has delegated UDC authority and a listed inspector¹². We could not confirm which inspection agency serves other unincorporated Kewaunee County parcels, so ask the clerk for the town containing the parcel who reviews plans, issues the UDC permit and performs inspections. The county itself does not issue the building permit; what stays with the county is shoreland and floodplain zoning permits and septic permits, so for those call the county's Land & Water Conservation Department^4,5.

Kewaunee County has no general countywide zoning ordinance of its own; the county's role is shoreland and floodplain zoning, administered by the Land & Water Conservation Department, while general land-use zoning outside the shoreland is set by each town, where that town has adopted its own zoning^2,5. The county directory lists separate zoning administrators for the towns of Ahnapee, Carlton, Casco, Franklin, Lincoln, Luxemburg, Montpelier, Pierce, Red River and West Kewaunee, and cities and villages may run their own land-use rules³. Wisconsin counties can adopt a countywide zoning ordinance under state law, but county zoning only applies in a town that has voted to adopt it, and a town outside county zoning may be unzoned or run its own town ordinance¹³. County shoreland zoning covers land within 1,000 feet of navigable lakes, ponds or flowages and within 300 feet of navigable rivers or streams, or to the landward side of the floodplain if that is farther². Within 75 feet of the ordinary high-water mark of a lake or stream, state shoreland rules set a 75-foot minimum building setback and cap structures at 35 feet tall, enforced through the county's shoreland ordinance^9,14. Because general zoning here is a town-by-town patchwork, confirm your specific town's rules on RVs, tiny homes, minimum home size and setbacks before you assume anything applies countywide⁵.

A valid state sanitary permit is required before anyone installs or works on a private onsite wastewater treatment system (POWTS), and a separate county sanitary permit is required for reconnection, repair and non-plumbing sanitation systems⁴. Septic, or POWTS, permits in Kewaunee County go through the county's Land & Water Conservation Department under the Kewaunee County Sanitary Ordinance, Chapter 15, which covers every municipality in the county that lacks public sewer^4,5. Statewide, POWTS plans are reviewed by the state Department of Safety and Professional Services, and larger or mixed-wastewater systems can require a joint DNR/DSPS review¹⁵. Once a system is installed, it must be visually inspected at least once every three years, and counties operate the state's maintenance-tracking program and send reminders to landowners¹⁶. A building without a public-sewer connection still needs an approved way to treat, recycle, disperse or hold its wastewater — the state does not pre-approve any specific composting toilet, privy or holding tank¹⁷. Sanitary permit fees are set by the county board and are due when the application is filed⁴. The soil is the real constraint here: only 6.4% of Kewaunee County's soil carries no severe limitation for a conventional drain field, so get a site evaluation from Land & Water Conservation before you commit to a parcel^5,6.

This guide could not confirm a countywide rule on living in an RV or occupying a tiny home on unincorporated Kewaunee County land, because that depends on your specific town's zoning — the county itself has no general zoning ordinance outside the shoreland⁵. Wisconsin's rule limiting a campsite to one recreational vehicle, with a reservation required, governs camping at state park campgrounds; it does not answer whether you can live in an RV on land you own¹⁸. A manufactured home can be installed and occupied once it passes a final inspection with no major health or safety violations, provided local zoning and sanitary requirements are also satisfied⁸. Confirm RV and tiny-home occupancy rules with your town's zoning administrator, and with the county's Land & Water Conservation Department if the parcel sits in the shoreland⁵.

First, confirm zoning for your parcel with your town's zoning administrator, or with the county in shoreland areas, before you buy⁵. Second, get a soil evaluation early, since only 6.4% of the county's soil carries no severe limitation for a conventional septic drain field⁶. Third, apply for your sanitary (septic) permit with the county's Land & Water Conservation Department under the Sanitary Ordinance before construction^4,5. Fourth, submit your Uniform Dwelling Code building permit application, with at least two sets of plans, to your town or the responsible inspection agency, and wait for plan approval and a posted permit before you begin^8,11. Fifth, call for inspection before covering up each phase of construction; your inspector has two business days after your request to inspect before you may cover the work⁸. Sixth, if you're drilling a well that isn't a high-capacity well, get your Well Construction Notification Number first, and file the Well Construction Report within thirty days after¹⁹. Seventh, finish your home's exterior within two years of permit issuance and pass a final inspection with no major health or safety violations before you take occupancy⁸.

Soils: only 6.4% of Kewaunee County's soil carries no severe limitation for a conventional septic drain field, so a site evaluation before you buy is close to essential⁶. Zoning: confirm your specific town's zoning, since the county has no general zoning ordinance of its own outside the shoreland⁵. Water: if you plan to drill a well that isn't a high-capacity well, budget for the state notification process, and check whether your town has an additional well-permit ordinance¹⁹. Flood risk: in a floodway, new structures, hazardous-material storage, and wells or sewage systems are prohibited outright, and floodfringe structures need their first floor at least two feet above base flood elevation²⁰. Access: a driveway connecting to a state highway needs a WisDOT connection permit, which costs nothing to apply for²¹. Terrain: 94.8% of the county's land sits at 15% slope or less, among the flattest ground you'll find for building and farming, though flat ground alone doesn't fix poor septic soils⁶. Taxes: Kewaunee County's effective property tax rate runs about 1.5%, with a median bill near $3,083 a year⁶. If you're weighing a short-term rental, Wisconsin requires a DATCP lodging permit for stays rented to tourists or transients²².