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

At a glance

Building permit

Required for a new one- or two-family home; file with the municipality¹

Zoning

Required in unincorporated areas, except specified extraterritorial areas²

Septic (POWTS)

Sanitary permit comes before the county zoning permit³

Owner-builder

An owner who occupies or will occupy the home may obtain the construction and erosion-control permits⁵

Minimum home size

750 sq ft of main-floor living area for a single-family home in regulated unincorporated districts⁶

Lot, height and yards

20,000 sq ft rural lot with septic; 2-1/2 stories or 35 ft; 10 ft side, 25 ft rear⁷⁸⁹

RV or tiny home

RV living remains unconfirmed; a dwelling must meet zoning and the 750 sq ft minimum⁶²

Private well

County well location permit required; DNR notification generally required before drilling¹⁰¹¹

County-highway driveway

New access and non-routine alterations require Highway Department approval¹²

Who to call

Contact details are copied from each office’s official page and were checked against it on October 15, 2026.

Do you need a building permit in Green County, Wisconsin?

Yes. A new one- or two-family home in Green County, including a stick-built, modular or manufactured-home installation, needs a Uniform Dwelling Code building permit, and the application goes to the town, village or city that contains the parcel¹³¹. The county's permit guide calls it a Statistical UDC Building Permit and adds that some towns also require their own town building permit after county zoning approval¹⁴. Additions and alterations vary by municipality, so ask the local building inspector what the work triggers¹⁵.

Do not start construction until the plans are approved and the building permit is issued and posted¹⁵. In regulated unincorporated Green County, a zoning permit is also required before a building, mobile home, private sewage system or other structure is built, enlarged, altered or moved unless an exception applies². An owner who occupies or will occupy the finished home may take out the construction and erosion-control permits without a dwelling contractor certification, but owner-builder status does not waive the permits or the code¹⁶⁵.

Who issues Green County building permits, and how do you reach the office?

The town, village or city issues the Uniform Dwelling Code permit for a new home in Green County, so identify the municipality containing the parcel and contact its building inspector directly¹. The county's Land Use & Zoning page provides a Town Building Inspectors document for finding the local inspector¹⁷. The Village of Belleville, which lies mostly in Dane County but reaches into Green County, runs its own building-permit office through its Building Inspector¹⁸.

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 53566¹⁷. The department asks applicants to contact Zoning to arrange to obtain a permit¹⁷. The inspector named on the building permit handles inspections, and the required stages are footings, foundation and reinforcement, rough work, insulation and final¹⁹. Zoning, sanitary (septic) and well location permits stay with Green County even though the municipality issues the building permit, because the county administers private onsite wastewater systems in unsewered areas and well locations²⁰¹⁰. Municipal building-permit fees vary, while Green County publishes its own zoning and sanitary fees; the county zoning permit for a one-story home of 750 to 1,500 square feet is $360²¹²².

Does Green County have zoning?

Yes. Green County zoning applies throughout unincorporated Green County except specified extraterritorial areas where municipalities exercise zoning powers; more restrictive town ordinances still control where applicable². The county publishes six districts, Residential, Agricultural, Conservancy, Commercial, Highway Interchange and Industrial, with parcel boundaries on its zoning maps²³. The Village of Belleville, mostly in Dane County, sets its own zoning inside the village²⁴.

A single-family home in the regulated area needs at least 750 square feet of living area on its main floor⁶. Rural lots with onsite wastewater generally need 20,000 square feet, and sewered lots in Juda generally need 10,000 square feet⁷. Minimum yards are 10 feet at the side and 25 feet at the rear, and 75 feet from water's edge⁹. Road setbacks use the greater of two measurements: a state highway needs 110 feet from the centerline or 50 feet from the right-of-way, a county highway 75 feet or 42 feet, and a town road 63 feet or 30 feet²⁵. Maximum building height is 2-1/2 stories or 35 feet⁸. The county notes these highlights can change when the code is amended, so confirm with Zoning before drawing a site plan¹⁷.

How do septic permits work in Green County?

Green County requires a licensed Certified Soil Tester to perform the soil test, then a plumber or designer prepares the private-system design and submits it with the application to the Zoning Department³. The department issues the sanitary permit to the plumber, and some system types need state approval³. Contact Green County Land Use & Zoning at 608-328-9423 before fixing the house site¹⁷.

The sanitary permit must be issued before the county zoning permit, and both come before the municipal building permit for a new residence using private septic³²⁶. The sanitary permit costs $575 under the fee schedule effective June 1, 2026, and connecting an existing system costs $260²⁷. Inspection and maintenance requirements for existing systems are unconfirmed; ask the Zoning Department. Only 13.5% of Green County soils are rated without severe limitations for a conventional drain field, so test early enough to move or redesign the house if needed²⁸.

Where a public sanitary sewer is available, all plumbing fixtures must connect to it, and the local sewer service entity decides availability for each lot²⁹. A non-plumbing sanitation system is allowed only for a structure with no internal plumbing; once plumbing is roughed in or running water is supplied, another approved sewage-disposal method is required³⁰.

Can you live in an RV or tiny home in Green County?

We could not confirm a general rule allowing long-term residential RV occupancy on private land in Green County. Ask the Green County Land Use & Zoning Department whether the parcel's district permits the proposed use and whether temporary occupancy during construction is allowed¹⁷. County zoning covers mobile homes and structures in regulated unincorporated areas, so moving a unit onto a parcel can require zoning approval².

We could not confirm that Green County treats tiny homes as a separate category. A unit used as a dwelling in the regulated unincorporated area must meet the county's 750-square-foot minimum living area on the main floor or floors, as well as the applicable district, setback and permit rules⁶⁹. Confirm how the county and municipal inspector will classify a proposed unit before buying it¹⁷¹.

Building a home in Green County: the steps, in order

1. Identify the municipality, county zoning district and any extraterritorial zoning authority for the parcel²²³.
2. If private septic is planned, hire a licensed soil tester, have the system designed and obtain the Green County sanitary permit³.
3. Make an appointment with Green County Zoning and bring the site plan or sketch, parcel description, available blueprints and tax parcel number for zoning review²⁶.
4. Get driveway approval: the county Highway Department for county highways, WisDOT for state highways, and the town chairman for town roads, since towns may require a driveway permit³¹³².
5. After county zoning approval, submit the Uniform Dwelling Code building-permit application to the municipality, and to the town if it requires its own permit²⁶⁴.
6. Start after issuance and request required inspections before work is covered¹⁵³³.
7. Before occupancy, complete the final building inspection and ensure the building and use conform to county zoning; a landowner may request the county certificate of compliance with the zoning application³⁴³⁵.

What should you check before buying land in Green County?

Confirm the zoning map, allowed use, setbacks, lot dimensions and septic area before relying on a listing's description²³⁹³⁶. If the seller is dividing land, confirm county approval: a land division under 35 acres that is not a subdivision must be surveyed, reviewed for suitability and recorded within 90 days³⁷.

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 setback³⁸³⁹. For a new private water system, the property owner must hold a well location permit issued by the County Conservationist or designee, and the County inspects the location when the work is complete¹⁰. Wisconsin also generally requires a Well Construction Notification Number before drilling unless an exception applies¹¹. The county fee schedule lists $100 for a floodplain or shoreland permit⁴⁰. Verify driveway jurisdiction because county-road access needs county approval, town-road access may need a town driveway permit, and state-highway access requires a WisDOT connection permit¹²³¹⁴¹. The effective property-tax rate is about 1.6%, with a median annual bill of $3,882⁴²⁴³.

Watch-outs

• For a home using private septic in regulated unincorporated Green County, the sanitary permit comes before the county zoning permit, which comes before the municipal building permit³²⁶.
• 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 checkpoint²⁸.
• Long-term RV living was not confirmed, and dwellings in regulated unincorporated areas face a 750-square-foot minimum; ask Green County Land Use & Zoning before buying or moving a unit onsite⁶¹⁷.

Sources

1. One- & Two-Family Uniform Dwelling Code, quoted and re-checked
2. Title 4 – Green County Zoning Regulations, Sanitary Code and Subdivision Regulations, quoted and re-checked
3. Steps for Obtaining Permits with Septic, quoted and re-checked
4. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
5. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
6. Title 4 – Green County Zoning Regulations, Sanitary Code and Subdivision Regulations, quoted and re-checked
7. Setbacks and Highlights of Residential & Ag Zoning Requirements, quoted and re-checked
8. Setbacks and Highlights of Residential & Ag Zoning Requirements, quoted and re-checked
9. Setbacks and Highlights of Zoning Requirements, quoted and re-checked
10. greencountywi.org, quoted and re-checked
11. Well and heat exchange notification (Wisconsin statewide rule), quoted and re-checked
12. greencountywi.org, quoted and re-checked
13. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
14. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
15. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
16. Instructions for Submitting a UDC Permit Application, quoted and re-checked
17. Green County Land Use & Zoning Department (greencountywi.org)
18. Village of Belleville: Chapter 12: Building Construction Code, § 12.04 (Green County), quoted and re-checked
19. UDC Inspection Requirements, quoted and re-checked
20. Title 9 Zoning, Public Safety, Health and Welfare, and Sanitary Code Regulations, quoted and re-checked
21. Wisconsin Administrative Code SPS 302.34 (Wisconsin statewide rule), quoted and re-checked
22. Green County Zoning Fee Schedule, quoted and re-checked
23. Title 4 – Green County Zoning Regulations, Sanitary Code and Subdivision Regulations, quoted and re-checked
24. Village of Belleville: Village of Belleville Municipal Code Table of Contents (Green County), quoted and re-checked
25. Setbacks and Highlights of Residential & Ag Zoning Requirements, quoted and re-checked
26. Steps for Obtaining Permits with Septic, quoted and re-checked
27. Title 9 Zoning, Public Safety, Health and Welfare, and Sanitary Code Regulations, quoted and re-checked
28. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
29. Title 9 Zoning, Public Safety, Health and Welfare, and Sanitary Code Regulations, quoted and re-checked
30. greencountywi.org, quoted and re-checked
31. Steps for Obtaining Permits with Septic, quoted and re-checked
32. Green County Highway Department (greencountywi.org)
33. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
34. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
35. Title 4 – Green County Zoning Regulations, Sanitary Code and Subdivision Regulations, quoted and re-checked
36. Setbacks and Highlights of Residential & Ag Zoning Requirements, quoted and re-checked
37. Setbacks and Highlights of Residential & Ag Zoning Requirements, quoted and re-checked
38. Floodplain Development Basics (Wisconsin statewide rule), quoted and re-checked
39. Wisconsin’s Shoreland Management Program (Wisconsin statewide rule), quoted and re-checked
40. Title 9 Zoning, Public Safety, Health and Welfare, and Sanitary Code Regulations, quoted and re-checked
41. State highway connection permits (driveways & more) (Wisconsin statewide rule), quoted and re-checked
42. Effective property tax rate: Bolthole Index county data
43. Median property tax bill: Bolthole Index county data

Written October 15, 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.