Building permits, zoning and septic rules 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 installations¹. For unincorporated land, the town building inspector generally issues the building permit, while county or municipal zoning approval may also be required². 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 inspections¹. Where the town or other municipality has no delegated authority, the application goes to the state Department of Safety and Professional Services¹. An owner-occupant may apply without Dwelling Contractor Certification, but that allowance does not waive the building permit or other approvals⁸.

For unincorporated Winnebago County land, start with the building inspector for the town containing the parcel; the town generally issues the building permit². 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 54903-2808². The county reviews setbacks, structure size, zoning and future land use, while town approval addresses construction and may cover other local ordinances². 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 days¹¹.

Winnebago County has zoning, but the administering authority depends on the parcel¹². The county issues zoning permits in Algoma, Neenah, Nekimi and Omro and handles rural, unincorporated shoreland areas countywide¹². Eleven other towns maintain their own zoning jurisdiction, while cities and villages issue their own zoning approvals³. 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 space⁶. Minimum lot dimensions can also increase when a private sewage system needs more area¹³.

The Winnebago County Planning & Zoning Department regulates private septic systems and holding tanks, although public sewers and town sanitary districts serve designated areas⁴. Installing, reconnecting or repairing a private system requires a county sanitary permit and a licensed plumber⁵. A sanitary permit is valid for two years from issuance, and it cannot issue until zoning and land-division compliance is shown⁵. 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 two¹⁴. Complete sanitary applications generally take 2 to 3 days². 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 fee¹⁰. A county zoning permit is listed at $265¹⁰. Installation inspections require at least 24 hours' notice⁴. Septic tanks generally face inspection and pumping within 36 months after occupancy for new construction and every 3 years thereafter, subject to the stated deferral⁵.

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 times⁷. 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 month⁶. 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 category⁶. A privy requires a county sanitary permit and is limited to property whose principal structure has no plumbing⁵.

1. Identify whether the county, town, village or city administers zoning, then verify the parcel's district, setbacks, height and allowed use^6,12.
2. If creating lots, complete the county land-division review and satisfy zoning, sewage and access rules¹³.
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^5,14.
4. Obtain zoning approval, then apply to the town building inspector for the Uniform Dwelling Code building permit^1,2.
5. Obtain a county highway permit for a new or changed access point on a county trunk highway¹⁵. In shoreland areas, a zoning permit may also be required for a driveway within 75 feet of the ordinary high-water mark².
6. Schedule the required footing, foundation, rough-work, insulation and final inspections with the inspector named on the building permit¹.
7. Occupy the home only after a final inspection finds no major health or safety violations¹⁶.

Confirm the zoning authority, district and buildable dimensions before relying on a listing's proposed use^6,12. 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 feet³. Floodplain overlays cover mapped 100-year and 500-year floodplains, and development is generally not allowed in the floodway³. Test septic feasibility early because only about 3.8% of county soils are rated without severe limits for a conventional drain field¹⁷. Confirm sewer availability because a private septic system generally must be discontinued within 1 year after public sewer becomes available and the county orders connection⁵.