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

At a glance

Building permit

Required for a new one- or two-family home; contact the municipality for filing and inspection¹²

Zoning

County zoning applies through the ordinance and adopted township zoning maps; dimensional rules vary by district³⁷

Septic permit

Oconto County processes required sanitary permits; some systems also require state action⁸⁹

RV living

No permanent habitation; stays beyond 60 consecutive days need a temporary-use permit and approved sanitary facility⁵¹⁰

Tiny home

Dwellings must be at least 700 square feet; park-model RVs belong only in licensed campgrounds⁶¹¹

Owner-builder

An owner who occupies or will occupy the home may obtain the construction and erosion-control permits¹²

Private well

Give Wisconsin DNR advance notice before constructing a new non-high-capacity well unless an exception applies¹³

Lot size and setbacks

Both are specified, but the parcel's district, sewer status, road class and shoreland location change the answer¹⁴¹⁵

Who to call

Contact details are copied from each office’s official page and were checked against it on October 7, 2026.

Do you need a building permit 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 authority¹⁶¹⁷.

The UDC building permit is only one approval. Oconto County separately processes land-use, sanitary and, when applicable, floodplain permits¹⁸¹⁹. Required UDC inspections include footings, foundation and reinforcement, rough work, insulation and a final inspection; the permit identifies the inspector to notify². 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 code¹².

Who issues Oconto County building permits, and how do you reach the offices?

A delegated municipality or Wisconsin DSPS issues the UDC building permit and arranges inspections for a new home in Oconto County¹². Oconto County Planning, Zoning and Solid Waste is the county counter for general zoning, floodplain, shoreland protection, sanitary review, land division and physical addresses²⁰. Call 920-834-6827 or visit 301 Washington Street, Oconto, WI 54153²⁰.

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 fees²¹. Call 920-834-6886 or visit 202 Van Dyke Street in Oconto²². A connection to a state trunk highway instead requires a WisDOT permit²³.

Does Oconto County have zoning?

Yes. The Oconto County Zoning Ordinance includes adopted township zoning maps, while annexed shoreland areas may be administered by the annexing city or village³. Permitted uses and dimensions depend on the mapped district⁷. The Agricultural District has a 10-contiguous-acre minimum parcel size for permitted uses, while other districts have their own standards²⁴¹⁴.

Setbacks vary by zoning district and may be supplemented by shoreland rules¹⁵. 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 differently²⁵. Creating parcels is regulated too: county staff review land divisions, including parcels smaller than 10 acres, and approved maps must be recorded²⁶.

How do septic permits work in Oconto County?

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 permit⁸. 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 one⁹. With few exceptions, POWTS work must be done by a properly licensed plumber and permitted by Oconto County²⁷.

Plan the soil evaluation early: only about 13.4% of Oconto County soils are rated without severe limits for a conventional septic drain field²⁸. A private sewage system serving a newly constructed building, or a building requiring a reconnection permit, must be approved, installed and inspected before occupancy²⁹. 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 occupancy³⁰.

Can you live in an RV or tiny home on your land in Oconto County?

Oconto County prohibits permanent habitation in an RV or camping unit on a private parcel⁵. 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 campground⁵¹⁰. A campground itself needs Park and Recreation zoning and conditional-use approval³¹.

Every dwelling used for human habitation must contain at least 700 square feet of livable area⁶. 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 campgrounds¹¹⁵. 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-half³².

Building a home in Oconto County: the steps, in order

1. Identify the mapped zoning district and confirm the use, lot size, setbacks and height limits with Oconto County Planning, Zoning and Solid Waste⁷¹⁵²⁵.
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 list³³¹⁸.
3. Complete any required soil and site evaluation and obtain the Oconto County sanitary permit⁹.
4. Obtain the applicable county land-use and floodplain approvals¹⁹²⁰.
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 permit¹².
6. Notify the inspector for each required construction inspection².

What should you check before buying land in Oconto County?

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 Waste¹⁴¹⁵³⁴. If a private well is planned, Wisconsin generally requires advance notice to DNR before a new non-high-capacity well is built¹³. 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 installation³⁵.

Test septic feasibility early because only about 13.4% of county soils avoid severe limits for a conventional drain field²⁸. 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 survey³⁶³⁷. The effective property-tax rate is about 1.3%, and the median annual property-tax bill is about $2,651³⁸³⁹.

Watch-outs

• Do not assume a county zoning district answers the whole site plan: minimum lot size varies by district and sewer status, while setbacks vary with road class and shoreland location¹⁴¹⁵.
• An RV is not a permanent dwelling, and annual placement requires a land-use permit plus an approved sanitary facility; Floodplain and Conservancy Districts are excluded¹⁰.
• Only about 13.4% of county soils avoid severe limits for a conventional septic drain field, so a favorable-looking parcel can still need a more involved wastewater design²⁸.
• Oconto County's certificate-of-occupancy details, county-specific private-well permit requirement and accessory-dwelling rules could not be confirmed; ask the UDC building inspector and county zoning office before committing to those plans²⁰.

Sources

1. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
2. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
3. Zoning, quoted and re-checked
4. Sanitary, quoted and re-checked
5. ocontocountywi.gov, quoted and re-checked
6. Chapter 14 Zoning Ordinance, quoted and re-checked
7. Zoning Maps, quoted and re-checked
8. Chapter 12 Sanitary Ordinance, quoted and re-checked
9. Chapter 12 Sanitary Ordinance, quoted and re-checked
10. ocontocountywi.gov, quoted and re-checked
11. RV and Camper Use Guide, quoted and re-checked
12. Instructions for Submitting a UDC Permit Application, quoted and re-checked
13. Well and heat exchange notification (Wisconsin statewide rule), quoted and re-checked
14. Chapter 14 Zoning Ordinance, quoted and re-checked
15. Chapter 14 Zoning Ordinance, quoted and re-checked
16. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
17. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
18. Zoning, quoted and re-checked
19. Steps to Acquiring Permits in Oconto County, quoted and re-checked
20. Oconto County Planning, Zoning and Solid Waste Department (ocontocountywi.gov)
21. Oconto County Driveway Permit, quoted and re-checked
22. Oconto County Highway Department (ocontocountywi.gov)
23. Frequently asked questions – State highway connection permits (Wisconsin statewide rule), quoted and re-checked
24. Chapter 14 Zoning Ordinance, quoted and re-checked
25. Chapter 14 Zoning Ordinance, quoted and re-checked
26. Land Divisions, quoted and re-checked
27. Oconto County Zoning Office — Sanitary Department (ocontocountywi.gov)
28. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
29. Chapter 12 Sanitary Ordinance, quoted and re-checked
30. Chapter 13 Oconto County Land Division Ordinance, quoted and re-checked
31. Oconto County RV/Camper Use Guide, quoted and re-checked
32. Chapter 14 Zoning Ordinance, quoted and re-checked
33. Steps to Acquiring Permits in Oconto County, quoted and re-checked
34. Zoning, quoted and re-checked
35. Sanitary, quoted and re-checked
36. Wooded share of land: Bolthole Index county data
37. Share of land at 15% slope or less: Bolthole Index county data
38. Effective property tax rate: Bolthole Index county data
39. Median property tax bill: Bolthole Index county data

Written October 7, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.