Trempealeau County, Wisconsin requires county building and land-use/zoning permits for a new home, and the Department of Land Management handles both12. A private septic system needs a county sanitary permit, with the soil test and system design coming before the permit application3. County zoning also applies, so confirm the parcel's district and dimensional rules before settling on a house, cabin, RV or tiny-home plan4.
At a glance
- Building permit
- Required for a new home and specified residential alterations, additions, cabins and detached garages1
- Zoning permit
- Required for homes, home additions, sheds, decks and accessory structures2
- Septic (POWTS) permit
- County sanitary permit required; a licensed plumber submits the application3
- Owner-builder
- An owner who occupies or will occupy the home may take out construction and erosion-control permits5
- RV or tiny-home living
- Private-land occupancy rules were not confirmed; ask Land Management before placing or occupying a unit2
- Private well
- Advance notice to Wisconsin DNR is generally required before a new non-high-capacity well6
- Shoreland setback
- At least 75 feet from the ordinary high water mark, subject to listed exceptions7
Who to call
Building permits
Trempealeau County Department of Land Management
Land-use/zoning, UDC building and manufactured-home permits in Trempealeau County
18600 Hobson Street, Whitehall, WI 54773-8614
Septic permits
Trempealeau County Department of Land Management — POWTS
County sanitary permits for private onsite wastewater treatment systems and specified non-plumbing sanitation systems
18600 Hobson Street, Whitehall, WI 54773-8614
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Trempealeau County, Wisconsin?
Yes. Trempealeau County requires a UDC building permit for a new home, an alteration or addition to a home, a cabin or a detached garage12. A land-use/zoning permit is also required for a home, home addition, shed, deck or accessory structure, while locating or replacing a manufactured home requires a manufactured-home permit2. Wisconsin's Uniform Dwelling Code is the statewide minimum code for one- and two-family dwellings built since June 1, 19808. Permit requirements outside that stated residential coverage can differ, so ask Land Management about barns, agricultural structures or another building type before starting work82. An owner who currently occupies or will occupy the home may take out the construction and erosion-control permits, but that owner-builder allowance does not erase the permit requirement5.
Who is the Trempealeau County building department, and how do you reach it?
The Trempealeau County Department of Land Management is the county contact for land-use/zoning, UDC building and manufactured-home permits2. Call 715-538-2311 ext. 223 or visit 18600 Hobson Street, Whitehall, WI 54773-86142. The county directs applicants to return completed applications and fees to Land Management, and its instructions say the applicant and the town chair or clerk must sign the listed building and manufactured-home permit forms2. The county also tells applicants to contact their town, village or city about any additional municipal requirements, so a county approval should not be treated as the only possible approval for an address2. If a proposed driveway connects to a state highway, Wisconsin Department of Transportation requires a separate state-highway connection permit9.
Does Trempealeau County have zoning?
Yes. Trempealeau County administers county zoning through the Department of Land Management, and the county's building page requires land-use/zoning permits for homes, home additions, sheds, decks and accessory structures42. The available county information does not establish one universal minimum lot size, minimum dwelling size, setback or height limit for every parcel, so ask Land Management for the zoning district and dimensional table that apply to the parcel2. Shoreland property has an important statewide baseline: buildings and structures generally must be at least 75 feet from the ordinary high water mark, subject to listed exceptions and setback averaging7. A structure taller than 35 feet is prohibited within 75 feet of the ordinary high water mark under the statewide shoreland standard10. Floodplain development can require both land-use and building permits, and new structures, wells and sewage systems are prohibited in the floodway11.
How do septic permits work in Trempealeau County?
Trempealeau County's Department of Land Management administers sanitary permits for private onsite wastewater treatment systems, commonly called POWTS or septic systems1213. Start with a soil test by a licensed soil tester; after the test, a licensed plumber designs the POWTS and submits the state sanitary permit application to the county313. Conventional and holding-tank plans may go to the county, while other system plans may require state submission3. Only about 7.5% of county soils are rated without severe limitations for a conventional septic drain field, so make the soil evaluation a purchase contingency rather than assuming a conventional system will fit14. Wisconsin requires privately owned wastewater systems to be visually inspected at least once every 3 years, with counties operating the maintenance-tracking programs15. Off-grid wastewater is not exempt: a building with plumbing that is not connected to public sewer still needs suitable treatment, recycling, dispersal or holding of wastewater16.
Can you live in an RV or tiny home on your land in Trempealeau County?
We could not confirm a county rule that generally allows or prohibits living in an RV on private land in Trempealeau County, so ask the Department of Land Management about the parcel's zoning district, duration limits and sanitation requirements before moving an RV onto it2. Wisconsin's state-park campsite rules apply to state park properties and do not answer private-land RV occupancy in Trempealeau County17. We also could not confirm a countywide tiny-home occupancy rule or minimum dwelling size; a site-built tiny home intended as a dwelling remains subject to the applicable permit, zoning and sanitation reviews1416. A manufactured home is a clearer category: Trempealeau County requires a permit to locate or replace one, and Wisconsin's UDC covers installation of manufactured homes produced on or after April 1, 2007218.
Building a home in Trempealeau County: the steps, in order
- Call Land Management at 715-538-2311 ext. 223 with the parcel number and proposed use; confirm zoning, floodplain or shoreland constraints and any town approval needed2.
- Arrange the soil test, then have a licensed plumber design the POWTS and submit the sanitary permit application to the county313.
- Complete the county land-use/zoning and UDC building applications, including the required applicant and town signature where applicable, and return the applications and fees to Land Management2.
- Give the permitting authority at least 2 sets of plans for the dwelling and wait until the plans are approved and the building permit is issued and posted before construction begins1920.
- Obtain advance Wisconsin DNR notice before drilling a new non-high-capacity private well, and obtain a WisDOT connection permit if access will connect to a state highway69.
- Call for inspection before covering each construction phase, then take occupancy only after a final inspection finds no major health or safety violations2122.
What should you check before buying land in Trempealeau County?
Confirm the parcel's zoning district, allowed use, setbacks, lot requirements, floodplain status and shoreland constraints with Land Management before making the purchase nonrefundable42. Make an acceptable soil test part of the deal because only about 7.5% of county soils are rated without severe limits for a conventional septic drain field14. If the parcel needs a well, plan for advance DNR notice before drilling a new non-high-capacity private well6. Confirm legal driveway access too, especially on a state highway where a WisDOT connection permit is required9. Trempealeau County's effective property-tax rate is about 1.6%, and its median annual property-tax bill is about $3,2692324. Farmland value is about $4,892 per acre, while the typical home value is about $277,6082526. The nearest city of 100,000 or more people is about 63 miles from the county's center27.
Watch-outs
- A county building permit is not the whole approval path: Trempealeau County separately requires land-use/zoning approval for common residential projects and tells applicants to ask their town, village or city about additional requirements2.
- A new home using private septic cannot receive its building permit until the sanitary permit has been issued, so complete the soil test and POWTS design early203.
- Private-land RV occupancy, tiny-home occupancy and countywide minimum dwelling size were not confirmed; ask Land Management about the exact parcel and proposed use before buying or placing a unit2.
Sources
- Trempealeau County Dept. of Land Management - UDC Building Permits (2026 county census)
- Trempealeau County Department of Land Management (co.trempealeau.wi.us)
- Sanitary (POWTS), quoted and re-checked
- Trempealeau County Dept. of Land Management (2026 county census)
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Well and heat exchange notification (Wisconsin statewide rule), quoted and re-checked
- Wisconsin’s Shoreland Management Program (Wisconsin statewide rule), quoted and re-checked
- One- & Two-Family (Uniform Dwelling Code), quoted and re-checked
- State highway connection permits (driveways & more) (Wisconsin statewide rule), quoted and re-checked
- Minimum Shoreland Wetland Zoning Model Ordinance (Wisconsin statewide rule), quoted and re-checked
- Floodplain Development Basics (Wisconsin statewide rule), quoted and re-checked
- Sanitary (POWTS), quoted and re-checked
- Trempealeau County Department of Land Management — POWTS (co.trempealeau.wi.us)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Wisconsin Maintenance Program (Wisconsin statewide rule), quoted and re-checked
- Wisconsin Administrative Code, SPS 382 (Wisconsin statewide rule), quoted and re-checked
- Camping Rules — Wisconsin State Park System (Wisconsin statewide rule), quoted and re-checked
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Wisconsin Administrative Code SPS 320.09 (Wisconsin statewide rule), quoted and re-checked
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Farmland value per acre (USDA census): Bolthole Index county data
- Typical home value (Zillow): Bolthole Index county data
- Distance to the nearest metro area: Bolthole Index county data
Written September 27, 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.