Green County, Wisconsin requires a building permit for a new one- or two-family home under the statewide Uniform Dwelling Code; applicants file with the municipality, not a single county building department1. Green County administers county zoning and sanitary permits through its Land Use & Zoning Department23. A sanitary permit must come before the building permit when a new home will use a private onsite wastewater system4.
At a glance
- Building permit
- Required for a new one- or two-family home; file with the municipality1
- Zoning
- Yes; Green County administers county zoning under its zoning regulations2
- Septic (POWTS)
- Green County Land Use & Zoning administers sanitary permits3
- Owner-builder
- An owner who occupies or will occupy the home may obtain the construction and erosion-control permits5
- Minimum lot size
- 20,000 sq ft with onsite wastewater; 10,000 sq ft in sewered Juda6
- RV or tiny home
- Long-term private-land occupancy was not confirmed; ask Land Use & Zoning before placing a unit2
- Private well
- Advance notice to Wisconsin DNR is generally required before drilling7
- County-highway driveway
- New access and non-routine alterations require Highway Department approval8
Who to call
Zoning
Green County Land Use & Zoning Department
County zoning, land-use and sanitary (POWTS) permit questions
1016 16th Avenue, Monroe, WI 53566
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 Green County, Wisconsin?
Yes. A new one- or two-family dwelling in Green County requires a building permit under Wisconsin's Uniform Dwelling Code, and the application goes to the municipality according to that municipality's procedure1. The statewide code applies to one- and two-family dwellings built since June 1, 19809. Requirements for additions and alterations can vary by municipality, so ask the town, village or city building inspector what the proposed work triggers4.
Do not start construction until the plans are approved and the building permit is issued and posted4. Green County separately administers zoning, and a home using private onsite wastewater cannot receive its building permit until the sanitary permit is issued24. An owner who occupies or will occupy the finished home may take out the construction and erosion-control permits through the owner-builder route; that allowance does not eliminate the permits5.
Who issues Green County building permits, and how do you reach the office?
The municipality issues the Uniform Dwelling Code permit for a new home in Green County, so identify the town, village or city containing the parcel and contact its building inspector directly1. The county's Land Use & Zoning page provides a Town Building Inspectors document for locating the appropriate local inspector10.
For county zoning and sanitary-permit questions, contact the Green County Land Use & Zoning Department at 608-328-9423 or visit 1016 16th Avenue, Monroe, WI 5356610. The department asks applicants to contact Zoning to arrange to obtain a permit10. Building inspections are required for covered dwellings and must be provided through the responsible registered inspection agency or another authorized local arrangement11. Local permit fees vary because each municipality sets its fees, while the state permit-seal fee for each new dwelling is $3012.
Does Green County have zoning?
Yes. Green County administers county zoning under its zoning regulations through the Land Use & Zoning Department2. Wisconsin county zoning applies only within towns that have adopted it, while a town outside county zoning may have its own ordinance or may be unzoned; confirm the current authority for the specific parcel with the department1310. Incorporated cities and villages should be checked with their own municipal zoning offices13.
In county-zoned rural areas using onsite wastewater, the minimum residential lot area is 20,000 square feet; in Juda with municipal sewer, it is 10,000 square feet6. The county summary gives a maximum building height of 2.5 stories or 35 feet, subject to district rules and other exceptions14. Near navigable water, Wisconsin's shoreland standard generally requires a 75-foot setback from the ordinary high water mark, with listed exceptions and possible setback averaging15.
How do septic permits work in Green County?
Green County Land Use & Zoning administers sanitary permits for private onsite wastewater treatment systems, commonly called POWTS, and requires a soil evaluation before sanitary-permit issuance3. Contact the department at 608-328-9423 before commissioning a system design or applying for the home permit10. A building permit for a new dwelling served by a private onsite system cannot issue until the sanitary permit is issued4.
The county's published sanitary-permit fee is $575, while reconnection or connection to an existing system is $260; the schedule is effective June 1, 202616. Only 13.5% of Green County soils are rated without severe limitations for a conventional septic drain field, so an early site evaluation can materially affect the buildable area and system budget17. Wisconsin requires privately owned systems to be visually inspected at least once every 3 years, with counties operating maintenance-tracking programs as state agents18.
Can you live in an RV or tiny home in Green County?
Green County's reviewed materials do not confirm a general rule allowing long-term residential RV occupancy on private land. Ask the Green County Land Use & Zoning Department whether the parcel's district permits the proposed use and whether temporary occupancy during construction is allowed210. Wisconsin's state-park camping rules apply to State Park System campsites, not to a private Green County parcel, so those rules do not answer the private-land question19.
The reviewed county materials also do not establish a distinct tiny-home occupancy rule. A small site-built dwelling still follows the statewide permit path for a new one- or two-family home, while local zoning controls the site92. A manufactured home installed as a new dwelling can follow the statewide dwelling-code framework, including the final-inspection requirement, but local zoning and sanitary approvals still apply20. Confirm classification before purchasing or moving any unit onto the land10.
Building a home in Green County: the steps, in order
- Identify the parcel's municipality and confirm the applicable zoning district with Green County Land Use & Zoning or the relevant municipal office213.
- Obtain the required soil evaluation and Green County sanitary permit if the home will use a private onsite wastewater system3.
- Resolve the county zoning approval and any shoreland or floodplain limits before finalizing the site plan21521.
- Submit the building-permit application to the municipality with required forms, fees, prerequisite approvals and at least 2 plan sets122.
- Obtain Green County Highway Department approval for a new connection to a county highway, or contact the town for a town-road driveway823.
- Begin work after permit issuance and request inspections before each construction phase is covered424.
- Occupy the home only after a final inspection finds no major health or safety violations25.
What should you check before buying land in Green County?
Confirm who zones the parcel and whether county, town, city or village rules govern its use before relying on a listing's description13. Check the zoning district, lot dimensions and septic feasibility together: county-zoned rural lots with onsite wastewater have a 20,000-square-foot minimum, and only 13.5% of county soils are rated without severe limitations for a conventional drain field617.
Check mapped floodplain and shoreland constraints before choosing a house site; Wisconsin generally prohibits new structures, wells and sewage systems in a floodway, while shoreland structures generally face a 75-foot setback2115. For a new private well, obtain a Well Construction Notification Number before drilling unless an exception applies7. Verify driveway jurisdiction because county-road access needs county approval, town-road access goes to the town, and state-highway access requires a WisDOT connection permit826. The effective property-tax rate is about 1.6%, with a median annual bill of $3,8822728.
Watch-outs
- A Green County sanitary permit must be issued before the building permit for a new home served by private onsite wastewater, so settle septic feasibility early4.
- Only 13.5% of Green County soils are rated without severe limitations for a conventional drain field, making the soil evaluation a major siting and budget checkpoint17.
- Long-term RV living and tiny-home occupancy were not confirmed as general private-land uses; ask Green County Land Use & Zoning about the parcel and proposed unit before buying or moving one onsite210.
Sources
- One- & Two-Family Uniform Dwelling Code, quoted and re-checked
- Green County Land Use & Zoning (2026 county census)
- Green County Title 4 - Zoning, Sanitary Code and Subdivision Regulations (2026 county census)
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Setbacks and Highlights of Residential & Ag Zoning Requirements, quoted and re-checked
- Well and heat exchange notification (Wisconsin statewide rule), quoted and re-checked
- Policies, Procedures, and Permits, quoted and re-checked
- One- & Two-Family (Uniform Dwelling Code) (Wisconsin statewide rule), quoted and re-checked
- Green County Land Use & Zoning Department (greencountywi.org)
- DSPS UDC Inspection Agency, quoted and re-checked
- Wisconsin Administrative Code SPS 302.34 (Wisconsin statewide rule), quoted and re-checked
- Local Land Use Regulations and Comprehensive Planning Status Inventory Project (Wisconsin statewide rule), quoted and re-checked
- Setbacks and Highlights of Residential & Ag Zoning Requirements, quoted and re-checked
- Wisconsin’s Shoreland Management Program (Wisconsin statewide rule), quoted and re-checked
- Green County Zoning Fee Schedule, quoted and re-checked
- 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
- 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
- Floodplain Development Basics (Wisconsin statewide rule), quoted and re-checked
- Wisconsin Administrative Code SPS 320.09 (Wisconsin statewide rule), quoted and re-checked
- Green County Highway Department (greencountywi.org)
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
- State highway connection permits (driveways & more) (Wisconsin statewide rule), quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: 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.