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

At a glance

Building permit

Required for a new home and issued by the town building inspector¹²

Zoning permit

Required where applicable; authority varies among the county and municipalities³

Septic permit

Required where applicable through the county POWTS program⁵⁶

RV on vacant land

Only occasional owner use in county-zoned areas; remove it at other times⁷⁸

Owner-builder

Available to an owner who occupies or will occupy the home; permits still apply⁹

Well permit

No county permit; a DNR construction notification is required before drilling¹⁰

Minimum home size

District-specific; one A-1/A-2 residential category requires 1,000 square feet¹¹

Sanitary permit fee

$700 for an at-grade, mound or holding-tank system, including the $100 state fee¹²

Who to call

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

Do you need a building permit in Winnebago County, Wisconsin?

Yes. A Uniform Dwelling Code building permit is required for a new one- or two-family home in Winnebago County, including stick-built, modular and manufactured-home installations.¹³ For unincorporated land, the town building inspector generally issues the building permit, while county or municipal zoning approval may also be required.² The Uniform Dwelling Code supplies the construction standards, and the delegated municipal inspector or a state-appointed inspector performs footing, foundation, rough-work, insulation and final inspections.¹⁴¹⁵ Where the town or other municipality has no delegated authority, the application goes to the state Department of Safety and Professional Services.¹³ An owner-occupant may apply without Dwelling Contractor Certification, but that allowance does not waive the building permit or other approvals.⁹

Who handles building and zoning in Winnebago County, and how do you reach them?

For unincorporated Winnebago County land, start with the building inspector for the town containing the parcel; the town generally issues the building permit.² For county-administered zoning, sanitary and erosion-control questions, contact the Winnebago County Planning & Zoning Department at 920-232-3344 or 112 Otter Avenue, P.O. Box 2808, Oshkosh, WI 54903-2808.¹⁶ The county reviews setbacks, structure size, zoning and future land use, while town approval addresses construction and may cover other local ordinances.¹⁶ County applications may be delivered in person, by mail or by email, but emailed applications wait for payment and review may take up to 30 days.¹⁷

Does Winnebago County have zoning?

Winnebago County has zoning, but the administering authority depends on the parcel.¹⁸ The county issues zoning permits in Algoma, Neenah, Nekimi and Omro and handles rural, unincorporated shoreland areas countywide.¹⁹ Eleven other towns maintain their own zoning jurisdiction, while cities and villages issue their own zoning approvals.³ In county-zoned areas, minimum home size, setbacks and height vary by district and use; one A-1/A-2 residential category requires at least 1,000 square feet of living space.¹¹²⁰²¹ Minimum lot dimensions can also increase when a private sewage system needs more area.²²

How do septic permits work in Winnebago County?

The Winnebago County Planning & Zoning Department regulates private septic systems and holding tanks, although public sewers and town sanitary districts serve designated areas.⁴ Installing, reconnecting or repairing a private system requires a county sanitary permit and a licensed plumber.⁵ A sanitary permit is valid for two years from issuance, and it cannot issue until zoning and land-division compliance is shown.⁵ When a sanitary permit is required, no building or zoning permit can be issued until the sanitary permit is issued, so start with the Planning & Zoning Department and ask it to sequence the two.²³ Complete sanitary applications generally take 2 to 3 days.²⁴ The listed sanitary permit fee is $700 for an at-grade, mound or holding-tank system, including the $100 state fee; listed pressure systems add a $250 review fee.¹² A county zoning permit is listed at $265.¹² Installation inspections require at least 24 hours' notice.²⁵ Septic tanks generally face inspection and pumping within 36 months after occupancy for new construction and every 3 years thereafter, subject to the stated deferral.²⁶

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

In areas governed by Winnebago County zoning, a camper or RV may be placed on a vacant parcel only for occasional owner use, meaning weekends or a vacation week, and must be removed at other times.⁸ On a residential premises governed by the county code, guest occupancy is limited to one RV for no more than 5 days in a calendar month.⁷ We could not confirm a rule specifically defining tiny-home occupancy, but county-zoned homes must meet district-specific use and dimensional standards, including a 1,000-square-foot minimum for one A-1/A-2 residential category.¹¹ A privy requires a county sanitary permit and is limited to property whose principal structure has no plumbing.²⁷

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

1. Identify whether the county, town, village or city administers zoning, then verify the parcel's district, setbacks, height and allowed use.¹⁸²⁰²¹
2. If creating lots, complete the county land-division review and satisfy zoning, sewage and access rules.²⁸
3. Confirm whether public sewer serves the parcel; designated service areas generally require connection, while private septic work needs a county sanitary permit, which must be issued before the building or zoning permit.²⁹⁵²³
4. Obtain zoning approval, then apply to the town building inspector for the Uniform Dwelling Code building permit.²¹³
5. Obtain a county highway permit for a new or changed access point on a county trunk highway.³⁰ In shoreland areas, a zoning permit may also be required for a driveway within 75 feet of the ordinary high-water mark.³¹
6. Schedule the required footing, foundation, rough-work, insulation and final inspections with the inspector named on the building permit.¹⁵
7. Occupy the home only after a final inspection finds no major health or safety violations.³²

What to check before you buy land in Winnebago County

Confirm the zoning authority, district and buildable dimensions before relying on a listing's proposed use.¹⁸²⁰ For shoreland property, new construction is generally set back 75 feet from the ordinary high-water mark; averaging may reduce the distance, but not below 50 feet.³³ Floodplain overlays cover mapped 100-year and 500-year floodplains, and development is generally not allowed in the floodway.³⁴ Test septic feasibility early because only about 3.8% of county soils are rated without severe limits for a conventional drain field.³⁵ Confirm sewer availability because a private septic system generally must be discontinued within 1 year after public sewer becomes available and the county orders connection.²⁹

Watch-outs

• Zoning authority varies by parcel; confirm whether the county, town, village or city administers the proposed use before buying.¹⁸
• In county-zoned areas, an RV on vacant land is limited to occasional owner use and must be removed at other times.⁷⁸
• County-zoned minimum home size, setbacks and height vary by district and use; confirm the parcel's dimensional table before designing.¹¹²⁰²¹
• The $700 sanitary permit fee for a listed system includes the $100 state fee, and after-the-fact permit applications may be doubled.¹²

Sources

1. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
2. Winnebago County - Permits FAQ (2026 county census)
3. winnebagocountywi.gov, quoted and re-checked
4. Sanitary System Information, quoted and re-checked
5. Chapter 16 - Private On-Site Wastewater Treatment System, quoted and re-checked
6. Sanitary System Information, quoted and re-checked
7. Chapter 23 – Town/County Zoning, quoted and re-checked
8. winnebagocountywi.gov, quoted and re-checked
9. Instructions for Submitting a UDC Permit Application, quoted and re-checked
10. Well and heat exchange notification (Wisconsin statewide rule), quoted and re-checked
11. Chapter 23 – Town/County Zoning, quoted and re-checked
12. Permit and Sanitary Fee Schedule, quoted and re-checked
13. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
14. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
15. UDC Inspection Requirements, quoted and re-checked
16. Winnebago County Planning & Zoning Department, Zoning Division (winnebagocountywi.gov)
17. Applications, quoted and re-checked
18. Frequently Asked Questions - Zoning Jurisdiction, quoted and re-checked
19. winnebagocountywi.gov, quoted and re-checked
20. Chapter 23 – Town/County Zoning, quoted and re-checked
21. Chapter 23 – Town/County Zoning, quoted and re-checked
22. Chapter 18 - Subdivision and Platting Table and Notes, quoted and re-checked
23. Sanitary System Information, quoted and re-checked
24. Frequently Asked Questions – Zoning Permits, quoted and re-checked
25. Sanitary System Information, quoted and re-checked
26. Chapter 16 – Private On-Site Wastewater Treatment System, quoted and re-checked
27. Chapter 16 – Private On-Site Wastewater Treatment System, quoted and re-checked
28. Chapter 18 – Subdivision and Platting, quoted and re-checked
29. Chapter 16 – Private On-Site Wastewater Treatment System, quoted and re-checked
30. Permits - County Highways, quoted and re-checked
31. Frequently Asked Questions – Zoning Permits, quoted and re-checked
32. Wisconsin’s Uniform Dwelling Code, quoted and re-checked
33. winnebagocountywi.gov, quoted and re-checked
34. winnebagocountywi.gov, quoted and re-checked
35. 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

Written October 9, 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.