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

Yes. Oconto County requires a building permit for a new one- or two-family dwelling, including a stick-built, modular or manufactured home¹. Wisconsin's statewide Uniform Dwelling Code governs these homes, with a delegated municipality issuing the permit when applicable and Wisconsin DSPS doing so where a municipality lacks that authority¹.

The UDC building permit is only one approval. Oconto County separately processes land-use, sanitary and, when applicable, floodplain permits^8,9. Required UDC inspections include footings, foundation and reinforcement, rough work, insulation and a final inspection; the permit identifies the inspector to notify¹. An owner who occupies or intends to occupy the home may apply without Dwelling Contractor Certification, but the owner-builder allowance does not waive the building permit or code⁶.

A delegated municipality or Wisconsin DSPS issues the UDC building permit and arranges inspections for a new home in Oconto County¹. Oconto County Planning, Zoning and Solid Waste is the county counter for general zoning, floodplain, shoreland protection, sanitary review, land division and physical addresses¹⁰. Call 920-834-6827 or visit 301 Washington Street, Oconto, WI 54153¹⁰.

For access from a county highway, the Oconto County Highway Department publishes a driveway permit, with a $200 non-refundable fee for a new driveway access request and higher after-the-fact fees¹¹. Call 920-834-6886 or visit 202 Van Dyke Street in Oconto¹². A connection to a state trunk highway instead requires a WisDOT permit¹³.

Yes. The Oconto County Zoning Ordinance includes adopted township zoning maps, while annexed shoreland areas may be administered by the annexing city or village². Permitted uses and dimensions depend on the mapped district². The Agricultural District has a 10-contiguous-acre minimum parcel size for permitted uses, while other districts have their own standards².

Setbacks vary by zoning district and may be supplemented by shoreland rules². The basic height limit for regulated objects, structures and equipment is 35 feet, but agricultural, communications and power-generating structures have separate standards; architectural projections and approved waivers are also treated differently². Creating parcels is regulated too: county staff review land divisions, including parcels smaller than 10 acres, and approved maps must be recorded¹⁴.

Oconto County Zoning administers the county sanitary ordinance, while Wisconsin statutes and administrative codes also apply; some systems require state action before the county can issue its permit⁴. A county sanitary permit may require a soil and site evaluation and recorded maintenance agreements, although replacing listed components such as a manhole cover, baffle or pump does not require one⁴. With few exceptions, POWTS work must be done by a properly licensed plumber and permitted by Oconto County³.

Plan the soil evaluation early: only about 13.4% of Oconto County soils are rated without severe limits for a conventional septic drain field¹⁵. A private sewage system serving a newly constructed building, or a building requiring a reconnection permit, must be approved, installed and inspected before occupancy⁴. Where a land division can connect to sanitary sewage collection and treatment, laterals and services must be installed to the property line during development and connection is required before occupancy¹⁶.

Oconto County prohibits permanent habitation in an RV or camping unit on a private parcel². Recreational use may last up to 60 consecutive days; annual placement requires a land-use permit and an approved sanitary facility, is excluded in Floodplain and Conservancy Districts, and cannot involve renting the RV outside a licensed campground². A campground itself needs Park and Recreation zoning and conditional-use approval⁵.

Every dwelling used for human habitation must contain at least 700 square feet of livable area². The county says tiny homes and park-model RVs typically do not qualify as RVs and are not allowed outside places such as campgrounds zoned for them; park-model RVs are limited to licensed campgrounds^2,5. In a mobile-home park, a stand may cover at most one-third of its lot, and the stand, parking and accessory structures together may cover at most one-half².

1. Identify the mapped zoning district and confirm the use, lot size, setbacks and height limits with Oconto County Planning, Zoning and Solid Waste².
2. Ask county staff whether the project needs wetland review, rezoning, conditional-use approval, a variance, land-division review, driveway access or a floodplain permit; the county's published process is a partial guide, not an exhaustive list^8,9.
3. Complete any required soil and site evaluation and obtain the Oconto County sanitary permit⁴.
4. Obtain the applicable county land-use and floodplain approvals^9,10.
5. Apply to the delegated municipality or Wisconsin DSPS for the UDC building permit¹. An owner-occupant may use the owner-builder route but still needs the permit⁶.
6. Notify the inspector for each required construction inspection¹.

Verify the mapped district, parcel size, road and shoreland setbacks, floodplain status, legal access and whether a proposed split needs county review with Oconto County Planning, Zoning and Solid Waste^2,8. If a private well is planned, Wisconsin generally requires advance notice to DNR before a new non-high-capacity well is built⁷. A habitable structure with neither plumbing nor water service may use a privy, composting toilet or another alternative as its POWTS, but it needs a county sanitary permit and inspection before installation³.

Test septic feasibility early because only about 13.4% of county soils avoid severe limits for a conventional drain field¹⁵. Oconto County is about 61% wooded and about 92% of its land has a slope of 15% or less, useful context for clearing and site-layout estimates but not a substitute for a parcel survey¹⁵. The effective property-tax rate is about 1.3%, and the median annual property-tax bill is about $2,651¹⁵.