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

Yes. A new one- or two-family home in Dunn County needs a permit under Wisconsin's Uniform Dwelling Code before construction begins². The code covers stick-built, modular and manufactured-home installations². Building permits are issued by the state-certified UDC inspector serving the parcel's township, or by the state if the municipality has not taken delegated authority, while the county separately handles zoning permits and sanitary permits^1,2,3. Alteration and addition requirements can vary by municipality, and sanitary, well, floodplain, driveway and utility approvals may also be required⁶. An owner who occupies or will occupy the finished home may obtain the construction and erosion-control permits, but owner-building does not waive the permits⁶.

The residential building-permit contact is the UDC building inspector assigned to the township where the parcel lies; Dunn County's zoning page publishes the inspector list and tells applicants to contact that inspector before construction³. Dunn County Planning & Land Use is a separate office at 3001 US Hwy 12 East, Suite 240A, Menomonie; call (715) 231-6520 or email pandz@dunncountywi.gov¹⁰. That office handles zoning permits and land-use approval, and the county issues sanitary (septic) permits, none of which the township inspector issues^4,10. The county says most development projects need a zoning permit and may require site plans, building plans and other documents¹⁰. New homes require footing, foundation and reinforcement, rough-construction, insulation and final inspections; contact the inspector identified on the UDC permit². Occupancy follows a final inspection with no major health or safety violations⁶.

Dunn County has comprehensive zoning, but Chapter 13 excludes Eau Galle, Elk Mound, New Haven, Rock Creek, Sand Creek and Springbrook; cities and villages enforce their own codes³. County shoreland, floodplain, land-division and sanitary ordinances still apply in every town³. Chapter 13 has thirteen districts, each with its own use, yard, lot-size and height rules, shown on official zoning maps⁷. Ordinary residential and accessory structures in the covered districts are generally limited to 35 feet, with district-specific exceptions⁷. Lot coverage also varies by district rather than having one countywide number⁷. If land will be divided, county review applies in unincorporated Dunn County, and a division into five or more lots requires a subdivision plat¹¹. Ask Planning & Land Use to identify the parcel's jurisdiction and district before designing the site¹⁰.

Dunn County requires a sanitary permit before issuing the zoning permit for a building served by a private onsite wastewater system⁵. A soil tester first files the test; a plumber or designer then prepares plans from the soil results and bedroom count, and the county inspects the system before backfilling^4,5. Dunn County reviews conventional systems and holding tanks under 3,000 gallons, while mound and at-grade systems plus industrial or larger holding tanks go to the state for plan review⁵. The published non-plumbing sanitary permit fee is $260¹². Privies, incinerating toilets and composting toilets still require county sanitary approval; a pit privy also needs soil verification¹². Only about 3.4% of county soils rate free of severe limits for a conventional drain field, so test before committing to a house site⁸.

In areas governed by Dunn County Chapter 13, a mobile recreational vehicle cannot be a permanent principal residence⁷. Where a single-family dwelling is allowed, temporary RV occupancy requires issued zoning and sanitary permits for the permanent home and is limited to 365 days within 547 days⁷. Agriculture-district recreational use is limited to 180 days per calendar year and cannot connect to a private onsite waste system or well⁷. These limits do not answer every parcel: six towns are outside Chapter 13, and cities and villages enforce their own codes¹³. We could not confirm a specific tiny-home occupancy rule or general minimum dwelling size; ask Planning & Land Use and the parcel's town or municipality before purchase¹⁰. Manufactured-home communities are allowed in R3 and by special exception in R2 and SR⁷.

1. Ask Planning & Land Use which zoning jurisdiction and district cover the parcel and whether shoreland or floodplain rules affect the site^3,10.
2. Obtain a driveway access permit from the town, county or state road authority before requesting the county address or fire number⁴.
3. Obtain the county permit for a new private well; high-capacity wells go through the Wisconsin DNR⁹.
4. Have the soil tested and the wastewater plans prepared, then obtain the sanitary permit before the county zoning permit⁵.
5. Submit the site plan and required project documents for county zoning review¹⁰.
6. Apply to the township's UDC inspector and wait for the building permit before construction^2,3.
7. Schedule the required construction inspections and pass the final inspection before occupancy^2,6.

Start with jurisdiction and soils. Confirm whether the parcel is covered by Chapter 13, lies in one of the six excepted towns, or sits in a city or village with its own zoning³. Get septic feasibility evaluated before relying on a house site because only about 3.4% of county soils rate free of severe limits for a conventional drain field⁸. Check shoreland and floodplain constraints with Planning & Land Use; those county ordinances apply in every town^3,10. Confirm which road authority must approve a new driveway and obtain that permit before requesting an address or fire number⁴. Budget separately for the private-well permit, zoning and building approvals because the published $260 figure applies only to the county's non-plumbing sanitary permit^9,12. The median property-tax bill is about $3,325 per year⁸.