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

Yes. A UDC building permit is required for every new one- or two-family dwelling, including stick-built, modular and manufactured-home installations¹. Wisconsin's Uniform Dwelling Code governs these homes statewide, but Marquette County's Building and Mechanical Code does not cover the Town of Springfield, the villages of Endeavor, Neshkoro and Oxford, or the City of Montello². Ask Planning, Zoning & Land Information to identify the correct issuing authority before filing³. An owner who occupies or will occupy the dwelling may apply without Dwelling Contractor Certification by completing the owner-occupant attestation, but that allowance does not waive building permits, trade requirements or inspections⁶. Starting work before obtaining the building permit doubles the applicable inspection fees⁹.

Start with the Marquette County Planning, Zoning & Land Information Department at 77 West Park Street, Room 104, Montello, WI 53949-9366; call 608.297.3036 or email permits@marquettecountywi.gov³. New homes use the Wisconsin UDC application, while other projects use the county General Building Permit Application; when a sanitary permit is required, it must come before the zoning permit². UDC applications require contractor credentials and legible dimensioned plans¹. The published residential schedule runs through December 2026 and lists a $94 plan-review fee per new unit, a building fee of $0.33 per square foot with an $847 minimum, and a $94 occupancy-certificate fee per new unit⁹. That fee listing does not by itself confirm that every municipality requires an occupancy certificate, so ask the issuing authority what document is needed before move-in⁹.

Marquette County general zoning is administered in the townships that have adopted it, including Buffalo, Crystal Lake, Douglas, Harris, Mecan, Montello, Moundville, Neshkoro, Newton, Oxford, Packwaukee and Westfield³. Shields and Springfield are unzoned for county general zoning, though county shoreland zoning still applies there within shoreland boundaries; whether either town has its own zoning ordinance is unconfirmed, so ask the town clerk³. County zoning maps and district standards are published, but incorporated municipalities may administer their own zoning^3,4. In county-zoned areas, a dwelling needs at least 400 square feet of year-round living area and a minimum width of 20 feet⁴. Lot minimums vary sharply by district: examples range from 2 acres in AG-3(2) to 40 acres in AG-1, while R-1 requires 30,000 square feet⁴. Road setbacks also vary by highway class, and the usual shoreline setback is 75 feet from the ordinary high-water mark or wetland boundary, subject to exceptions¹⁰. Confirm the parcel's district, local jurisdiction, setbacks and allowed use with Planning & Zoning before designing a home³.

Marquette County Planning, Zoning & Land Information administers private septic and POWTS rules wherever municipal sewer is unavailable, including in towns that run their own zoning or building permits⁴. Every POWTS or non-plumbing sanitation system needs its own county application and permit before installation, enlargement, alteration, reconnection or construction of a structure that needs the system⁵. The application includes a soil and site evaluation and applicable fees⁵. Septic feasibility deserves attention before purchase because only 0.7% of county soils are rated without severe limitations for a conventional drain field¹¹. A newly installed, modified or reconnected POWTS must remain open for county inspection and acceptance⁵. Off-grid does not mean permit-free: a non-plumbing system is limited to a structure with no indoor plumbing, and adding plumbing requires a POWTS before water service is connected⁵.

In areas under county general zoning, RV camping on a vacant lot is seasonal from April 15 through December 1, requires sanitation and waste disposal, and is prohibited in the Residential R-1 district^4,7. A camping unit cannot be occupied by someone with no other regular residence⁷. Year-round use requires a conditional-use permit, at least 5 acres outside a platted subdivision, Town Board approval, annual inspection and other conditions⁷. Camping while a permitted dwelling is under construction is limited to one year after the zoning or residential building permit issues⁷. Marquette County does not define a separate tiny-home occupancy path in the available rules; a dwelling in county-zoned areas must still meet the 400-square-foot living-area and 20-foot-width minimums⁴. Single-wide manufactured homes are generally limited to licensed manufactured-home parks, except approved replacement of an existing single-wide⁴.

1. Ask Planning & Zoning which building authority and zoning jurisdiction cover the address, especially in Shields, Springfield or an incorporated municipality^2,3.

1. Confirm the zoning district, lot size, road and shoreline setbacks, and any mapped floodplain limits before final design^4,10.

1. Complete the soil and site evaluation and obtain the sanitary permit before the zoning permit when private wastewater service is needed^2,5.

1. Secure driveway approval from the Highway Department for a county highway, town officials for a town road, or WisDOT for a state highway^10,12.

1. File the correct application, plans and fees, and do not begin work before issuance^2,9.

1. Notify the inspector for footing, foundation, rough, insulation and final inspections, then confirm what occupancy approval the issuing authority requires^1,9.

Put septic feasibility near the top of the due-diligence list because only 0.7% of county soils are rated without severe limitations for a conventional drain field¹¹. Check the county zoning map and verify the district with Planning & Zoning because lot size, setbacks and allowed uses depend on the parcel's location^3,4. A land division subject to Chapter 69 generally needs at least 30,000 square feet, a 100-foot average width and qualifying street access, with county review and soil, floodplain or wetland information as applicable¹³. Development in a mapped floodplain requires county review and may need added delineation before a sanitary permit⁴. Confirm driveway approval with the authority maintaining the road^10,12. For a new private well, obtain the Wisconsin DNR notification number before construction; we could not confirm an additional Marquette County well permit⁸.