Bolthole Index

Sauk County, Wisconsin

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

60Index Score / 100
#54 of 72 in Wisconsin

New one- and two-family homes in Sauk County, Wisconsin require a Uniform Dwelling Code building permit, including stick-built, modular and manufactured homes1. Each municipality contracts with its own private building inspector, zoning authority varies by parcel, and Sauk County keeps responsibility for septic permits throughout the county234. County land-use and septic permit applications are filed online5.

At a glance

Building permit
Required for new homes covered by Wisconsin's statewide code; issued through the municipality's contracted inspector62
Zoning
County, town, city, village or extraterritorial rules may apply; some areas may have no zoning district78
Septic
The county administers private onsite wastewater rules and requires sanitary permits for covered work910
RV and camping
Temporary camping is limited where the county ordinance applies; an RV cannot be a permanent residence there1112
Owner-builder
An owner-occupant may apply without Dwelling Contractor Certification; building permits and inspections still apply1314
Tiny home
Countywide residential occupancy rules were not confirmed; ask Zoning Services and the town building inspector151617
Permit timing
County land-use and sanitary applications are online; published review time is 7–10 days18

Who to call

Building permits

Sauk County Town Building Inspectors (varies by municipality)

Uniform Dwelling Code building permits and inspections; Sauk County has no single county building department, each municipality contracts its own private building inspector, and the county publishes a Town Building Inspector list and directs applicants to also contact their town chair or clerk

Zoning

Sauk County Land Resources and Environment — Zoning Services

County zoning ordinance (Chapter 7), shoreland, floodplain, nonmetallic mining and land-use permitting, plus certified survey map and subdivision review, for unincorporated Sauk County

(608) 355-3245

Room 213, Sauk County West Square Building, 505 Broadway, Baraboo, WI 53913

Septic permits

Sauk County Land Resources and Environment — Land Use/Sanitary Permits

Land use and sanitary (POWTS/septic) permit applications for Sauk County, now filed through an online OpenGov portal

(608) 355-3245

Online permits →

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

Off-grid gear

Going off-grid in Sauk County means bringing your own water and power. The kit we’d start with:

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

A Uniform Dwelling Code building permit is required for a new one- or two-family dwelling in Sauk County, including stick-built, modular and manufactured-home installations6. The UDC is Wisconsin's statewide building code and applies the same way in every county, covering one- and two-family dwellings built since June 1, 1980; Sauk County municipalities contract with private building inspectors for local administration19202. New homes require footing, foundation and reinforcement, rough, insulation and final inspections21. A Sauk County owner who occupies or will occupy the dwelling may apply without Dwelling Contractor Certification by making the owner-occupant attestation in the electronic application; building permits, code compliance and inspections still apply131422.

Who issues Sauk County building permits, and how do you reach them?

Sauk County’s Town Building Inspectors page identifies the municipality’s contracted inspector and advises contacting the town chair or clerk about additional local building permit requirements16. Wisconsin Dells, mainly in Columbia County but extending into Sauk County, issues its own building permits23. Sauk County administers septic rules countywide; Wisconsin Dells also requires a city private-sewage permit before construction when public sewer is unavailable424. Sauk County Land Resources and Environment handles county zoning and land-use approval at 505 Broadway in Baraboo, phone (608) 355-324517. County land-use and sanitary applications use the OpenGov portal5. Each municipality sets its UDC building permit fees by ordinance, and a $30 state permit-seal fee applies to each new dwelling25. The county's planning and zoning fee schedule is published but may not be all-inclusive, and fee changes accompany the zoning rewrite, so ask department staff about project-specific fees2627.

Does Sauk County have zoning?

Sauk County zoning applies to unincorporated land in towns covered by Chapter 7; city, village, extraterritorial or town zoning may govern other parcels, and some areas may have no zoning district78. Wisconsin Dells, a city reaching into Sauk County from Columbia County, sets its own zoning; Sauk County retains septic administration, with an additional city private-sewage permit where public sewer is unavailable28424. The county’s Zoning District Finder uses the official digital GIS map; a blank area may be under another zoning authority or have no zoning29. The rewrite changes districts and adds overlay districts, but the prior ordinance remains effective in a covered town for one year or until town adoption, whichever comes first3031. Ask Zoning Services which ordinance version and district apply; we could not confirm current parcel-specific minimum home size, lot size, ordinary setbacks, lot coverage or height standards817.

How do septic permits work in Sauk County?

Sauk County Land Resources and Environment administers septic permits for private onsite wastewater systems throughout Sauk County, including addresses where another local government handles building permits or zoning932. A sanitary permit is required for covered construction, alteration, changes of use or placement of a human-habitation structure that needs a POWTS33. Depending on the project, the application may require approved plans, a soil test report, a plot plan, fees and other listed materials; a new residence cannot be occupied until the system is installed and fully functional33. Published fees include $450 for a conventional system and $550 for a holding tank, and septic fees double if work begins without septic permits10. Submit the septic permit application online and allow for the published 7–10-day review period34. Test feasibility early because only about 3.2% of Sauk County soils are rated without severe limitations for a conventional drain field35.

Can you live in an RV or tiny home on land in Sauk County?

On unincorporated land subject to Sauk County’s Chapter 7 camping rules, an RV or other camping unit cannot serve as a permanent abode or legal residence12. The county camping page allows up to 6 stays of 15 consecutive days or one 45-day stay annually, generally with a land-use camping permit in specified districts3611. The 2026 Chapter 7 draft instead limits non-campground stays to 15 consecutive days and 45 days total annually; removal or enclosed storage and at least three camping-unit-free days between stays are required12. Ask Zoning Services which camping schedule governs the parcel because town adoption affects the applicable ordinance1217. We could not confirm a tiny-home classification; ask the zoning authority how the design is treated and the municipality’s inspector about dwelling building permits8616.

What are the steps to building a home in Sauk County?

  1. Identify the municipality and use the county zoning map to determine whether county, town, city, village or extraterritorial zoning applies29.
  2. Ask the applicable zoning authority about the proposed use, district standards and land-use approval; ask Sauk County about its published fees and any subdivision, plat or certified-survey-map review273738.
  3. Complete the soil evaluation and obtain the Sauk County septic permit before seeking a building permit for a new home served by private septic3339.
  4. File county land-use and septic permit applications through the online portal and plan around the published 7–10-day review time345.
  5. Find the municipality's contracted inspector and submit the UDC building permit application, plans, required data and fee166.
  6. Schedule the required footing, foundation and reinforcement, rough, insulation and final inspections21.

What should you check before buying land in Sauk County?

Before dividing Sauk County land, ask Planning and Zoning about Chapter 22 land-division review and submit certified survey maps through the county portal3738. Published review fees include $100 plus $20 per additional lot for a certified survey map and $300 plus $20 per lot for a preliminary subdivision plat; confirm current charges with staff because zoning-rewrite fee changes are also published4027. Only about 3.2% of Sauk County soils are rated without severe limitations for conventional septic drain fields, so evaluate soils before fixing a house site35. Ask Zoning Services about floodplain approval and applicable waterfront standards414217. A new ordinary private well requires advance DNR construction notification; any additional Sauk County well permit remains unconfirmed4317. New or altered state-highway driveway connections require WisDOT approval; ask Zoning Services who handles access from county or local roads4417.

Watch-outs

  • Sauk County's zoning rules vary by jurisdiction, and the prior county ordinance remains effective in a town subject to it for one year or until that town adopts the rewrite, whichever comes first831.
  • Sauk County’s camping page and 2026 Chapter 7 draft give different annual stay limits; ask Zoning Services which ordinance and camping schedule apply before planning RV stays361217.
  • A new residence served by a private onsite wastewater system cannot be occupied until the POWTS is installed and fully functional33.

Sources

  1. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
  2. Town Building Inspectors, quoted and re-checked
  3. Town Building Inspectors, quoted and re-checked
  4. Sauk County Code Chapter 25 Private Sewage System Ordinance, quoted and re-checked
  5. Permit Applications, Forms, Instructions and Affidavits, quoted and re-checked
  6. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
  7. Sauk County Zoning Ordinance, Chapter 7, quoted and re-checked
  8. Zoning District Finder, quoted and re-checked
  9. Chapter 25 Private Sewage System Ordinance, quoted and re-checked
  10. Sauk County Planning & Zoning Fee Schedule, quoted and re-checked
  11. Camping Regulations/Permit, quoted and re-checked
  12. Sauk County Zoning Ordinance, Chapter 7, Draft dated 08/19/2026, quoted and re-checked
  13. Instructions for Submitting a UDC Permit Application, quoted and re-checked
  14. Instructions for Submitting a UDC Permit Application, quoted and re-checked
  15. Zoning Services (2026 county census)
  16. Sauk County Town Building Inspectors (varies by municipality) (co.sauk.wi.us)
  17. Sauk County Land Resources and Environment — Zoning Services (co.sauk.wi.us)
  18. Land Use/Sanitary Permit Application, quoted and re-checked
  19. Wisconsin’s Uniform Dwelling Code, quoted and re-checked
  20. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
  21. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
  22. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  23. Wisconsin Dells: Chapter 14 Building and Mechanical Code (Sauk County), quoted and re-checked
  24. Wisconsin Dells: official source (Sauk County), quoted and re-checked
  25. Wisconsin Administrative Code SPS 302.34 (Wisconsin statewide rule), quoted and re-checked
  26. Planning and Zoning Fee Schedule, quoted and re-checked
  27. Planning and Zoning Fee Schedule, quoted and re-checked
  28. Wisconsin Dells: Chapter 19 Wisconsin Dells Zoning Code (Sauk County), quoted and re-checked
  29. Zoning District Finder, quoted and re-checked
  30. Zoning Services, quoted and re-checked
  31. Zoning Services, quoted and re-checked
  32. Zoning Services, quoted and re-checked
  33. Chapter 25 Private Sewage System Ordinance, quoted and re-checked
  34. Land Use/Sanitary Permit Application, quoted and re-checked
  35. 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
  36. Camping Regulations/Permit, quoted and re-checked
  37. Sauk County Planning and Zoning Ordinances, quoted and re-checked
  38. Certified Survey Map and Subdivision/Plat Review Applications, quoted and re-checked
  39. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  40. co.sauk.wi.us, quoted and re-checked
  41. Zoning Services, quoted and re-checked
  42. Wisconsin’s Shoreland Management Program (Wisconsin statewide rule), quoted and re-checked
  43. Well and heat exchange notification (Wisconsin statewide rule), quoted and re-checked
  44. Frequently asked questions – State highway connection permits (Wisconsin statewide rule), quoted and re-checked

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.

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Compared with neighboring counties

Like all 6 of its neighbors, Sauk County requires a building permit for a home.

RuleSauk CountyRichland CountyColumbia CountyAdams CountyIowa CountyJuneau CountyDane County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Land Resources & Env. Dept.County Zoning & Sanitation Dept.County Planning & Zoning Dept.County Planning & Zoning Dept.County Office of Planning & DevelopmentCounty Sanitation & Zoning Dept.County Dept. of Planning & Development

County locator

Sauk County in Wisconsin

60
County map
Sauk County highlighted among the Wisconsin counties · colored by Index score

How Sauk County scores

Seclusion33100% ev.
Self-Sufficiency64100% ev.
Admin Boringness44100% ev.
Durability65100% ev.
Property Autonomy70100% ev.
Carry Cost61100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$343kTypical home
1.5%Property tax
$6,278Land / acre
37.1"Annual rain
8.1% of yrsSevere drought
1.7 / yr (+1.6)Mid-century 100°F days
13.4 daysMid-century dry spell
1.69" (+6.4%)Mid-century 1-day rain
1.72×Wildfire change factor
100%Forward climate coverage
$1,420Home insurance / yr
2.3% / yrInsurance growth
0.71%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
67,801People within 30 min
3,857,372People within 2 hr
44,394Radius comparison (15 mi)
79.3People / sq mi
0.2%Federal land
62.6%Land at 15% slope or less
3.2%Soils rated "not limited" for septic (strict USDA rating)
16,841 acWorkable land screen
43.5%Wooded land
50.6 tonsBiomass / forest ac
46.2°FAvg temp

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Cities and towns in Sauk County

Inside a city, town or township here, that government usually sets zoning and may issue its own building permits; the county’s rules above cover land outside them.

Not yet researched: Baraboo · Town of Baraboo · Town of Bear Creek · Town of Dellona · Town of Excelsior · Town of Fairfield · Town of Franklin · Town of Freedom · Town of Greenfield · Town of Honey Creek · Town of Ironton · Village of Ironton · Town of La Valle · Village of La Valle · Village of Lime Ridge · Village of Loganville · Town of Merrimac · Village of Merrimac · Village of North Freedom · Village of Plain · Town of Prairie du Sac · Village of Prairie du Sac · Reedsburg · Town of Reedsburg · Village of Rock Springs · Village of Sauk City · Town of Spring Green · Village of Spring Green · Town of Sumpter · Town of Troy · Town of Washington · Village of West Baraboo · Town of Westfield · Town of Winfield · Town of Woodland

Answers from the rulebook for Sauk County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Sauk County rules

  • County-wide zoningPresent (with conditions)

    County zoning and related land-use regulation in Sauk County, subject to municipal adoption and transition rules.

    • The county Zoning Services Division administers zoning, shoreland, floodplain, and related ordinances.
    • The Chapter 7 amendment page states that the prior ordinance remains effective for one year in towns subject to it, or until the new ordinance is adopted by that town via resolution, whichever is sooner.
    “The Sauk County Zoning Ordinance existing prior to this reenactment will remain in effect for one year in any town that is subject to the current ordinance or until this new ordinance is adopted by that town via a resolution, whichever is sooner.”
    One more reviewed finding on this topic
    • Present (with conditions) — Sauk County zoning regulation outside incorporated cities and villages, in the towns identified by Chapter 7.
      “the entire area of Sauk County, outside the limits of incorporated cities and villages”
  • Local zoningVaries (with conditions)

    Aggregate local zoning conditions across Sauk County, including county-zoned unincorporated areas, town-zoned areas, incorporated cities and villages, extraterritorial zoning areas, and areas with no zoning district.

    • The conclusion aggregates different local zoning authorities and does not mean Sauk County administers every municipal or town ordinance.
    • A property-specific determination requires consulting the official Sauk County zoning map and the applicable city, village, or town authority.
    • Some areas may not be zoned according to the county's official zoning-district explanation.
    • The prior county ordinance remains effective for one year in any town subject to it, or until the town adopts the rewritten ordinance by resolution, whichever occurs sooner.
    “Where the official zoning map does not indicate a zoning district for a particular area, the area is either within the corporate limits of a city or village, within extraterritorial zoning jurisdiction by a city or village, under the jurisdiction of town zoning, or is not zoned.”
    One more reviewed finding on this topic
    • Varies (with conditions) — Aggregate of township and municipal zoning within Sauk County; the county does not administer every local ordinance.
      “If the town board fails to approve the comprehensive revision within a year, neither the existing ordinance nor the comprehensive revision shall be effective in that town.”
  • Zoning districtsPublished (with conditions)

    Sauk County zoning districts and overlay districts.

    • The county states that the Chapter 7 rewrite amended zoning districts and added new and overlay districts.
    • Town adoption and transition rules affect effectiveness.
    “New zoning districts are being proposed, including: Limited Commercial (LC), and Public Open Space (POS), and the addition of Overlay Zoning Districts including Planned Unit Development (PUD) and Tri-County Airport (TAP).”
    One more reviewed finding on this topic
    • Published (with conditions) — Sauk County official zoning districts and zoning map.
      “shown on the official zoning map of Sauk County”
  • Living in an RVTemporary only (with conditions)

    Recreational vehicles and other camping units used for human habitation in unincorporated areas subject to the Sauk County Chapter 7 zoning ordinance.

    • At a campground, a camping unit may not be occupied for more than 240 days in a calendar year; separate stays are combined.
    • Continuous year-round occupancy and use as a permanent abode or legal place of residence are prohibited.
    • On a lot or parcel outside the campground provisions, each stay must be limited to 15 consecutive days and no more than 45 days per calendar year.
    • After each stay, all camping units and equipment must be removed or stored in a permitted structure with a cover and sides; the property must remain free of camping units and equipment for at least three consecutive days before another stay.
    • Camping units must comply with applicable front-yard, road right-of-way, side-yard, rear-yard, wetland, and ordinary high-water-mark setbacks.
    • The rewrite applies only in unincorporated areas where the town board has adopted it; the prior ordinance remains in effect for one year or until town adoption, whichever is sooner.

    campground occupancy limit: <= 240 days per calendar year (separate stays are combined) · non-campground stay limit: <= 15 consecutive days (each stay) · non-campground annual limit: <= 45 days per calendar year (property must be free of camping units and equipment for at least three consecutive days before another stay)

    “A camping unit may not be occupied for more than 240 days in a calendar year. The stay does not need to be continuous, and all separate stays must be combined in determining the 240-day period.”
    One more reviewed finding on this topic
    • Limited — Recreational vehicles and other camping units used for camping on land in unincorporated Sauk County subject to the county ordinance.
      “Camping is limited to either no more than 6 stays per year, and each stay is limited to 15 consecutive days, or one stay per year which is limited to 45 days.”
  • Camping on your landLimited

    Temporary camping on land subject to the Sauk County Zoning Ordinance.

    • A land-use camping permit is required.
    • The source specifies six 15-day stays per year or one 45-day stay per year.
    • Camping units and equipment must be removed or stored after each stay, and the property must be free of them for at least three consecutive days before another stay.
    • Sanitary provisions, trash disposal, sufficient land area, setbacks, and storage requirements apply.
    “Camping is limited to either no more than 6 stays per year”
  • Who permits septicCounty (with conditions)

    Private onsite wastewater treatment systems throughout Sauk County.

    • The ordinance applies except where Wisconsin statutes provide otherwise.
    • The county cooperates with state and local agencies.
    “Pursuant to Wis. Stat. § 145.20(1), there is hereby created the position of POWTS Administrator for Sauk County, who shall have the following duties and powers:”
    2 more reviewed findings on this topic
    • County (with conditions) — Private onsite wastewater treatment systems requiring permits in Sauk County.
      “until all appropriate permits have been issued by the county department.”
    • County — Private onsite wastewater treatment system ordinances, sanitary permits, and related county zoning-services administration.
      “Private Onsite Waste Water Treatment Systems Ordinance.”
  • Septic permitRequired

    Private onsite wastewater systems and sanitary-permit work in Sauk County.

    • The county fee schedule states septic fees are doubled when work starts without permits.
    • Permit type and fee vary by system type, including conventional, holding-tank, mound, IGP, at-grade, replacement, privy/reconnection, and large systems.

    conventional system fee: 450 USD · holding tank fee: 550 USD · large system threshold: >= 1000 gallons per day · large system fee: 650 USD

    “Septic Fees are doubled when work is started with out permits.”
    One more reviewed finding on this topic
    • Required — Construction, alteration, use changes, or placement of human-habitation structures requiring a POWTS.
      “without appropriate sanitary permits and without full compliance with the provisions of this ordinance.”
  • Subdividing landRegulated (with conditions)

    Subdivision, land-division, certified-survey-map, and plat review in Sauk County.

    • The fee schedule distinguishes preliminary subdivision plat review, final plat review, condominium plat review, development-plan review, and CSM review.
    • Fees vary by plat type and number of lots or interests.

    preliminary subdivision plat review fee: 300 USD (plus $20 per lot) · final plat review fee: 300 USD · CSM review fee: 100 USD (plus $20 per additional lot)

    “Prel. Subdivision Plat Review - $300 plus $20/lot”
    2 more reviewed findings on this topic
  • Building in a floodplainLimited

    Development subject to Sauk County floodplain regulation.

    • The county Zoning Division administers a floodplain ordinance.
    • A $200 floodplain surcharge appears in the published fee schedule.
    • The reviewed sources did not establish the complete floodplain-development permit criteria.

    floodplain surcharge: 200 USD

    “These ordinances include: Zoning, Shoreland Protection, Floodplain”
  • Permit feesPublished (with conditions)

    Sauk County planning and zoning fees.

    • The county page states that the listing may not be all-inclusive.
    • Specific fee questions should be confirmed with department staff.
    • The 2026 fee-resolution page states that fee changes accompany the Chapter 7 rewrite and include accessory dwelling units, signs, adult establishments, planned unit developments, and special events.
    “Attached is a listing of the current fee schedule. Please note, this listing may not be all inclusive. If you have a question on a specific fee, please contact the department staff. Thank you!”
    One more reviewed finding on this topic
    • Published (with conditions) — Sauk County planning, zoning, land-use, and sanitary permit fees.
      “Attached is a listing of the current fee schedule.”
  • Permit processPublished (with conditions)

    Sauk County land-use and sanitary permit submission and review.

    • Permits are submitted through the county's OpenGov portal.
    • Applicants are advised to contact the county before construction, development, or excavation because some uses may require a land-use permit.
    • The county states that permit review takes 7-10 days.

    permit review time: 7-10 days

    “THE PERMIT REVIEW PROCESS TAKES 7-10 DAYS. Land Use and Sanitary Permits have now gone fully on-line.”
    2 more reviewed findings on this topic

Wisconsin rules that apply here

  • Building permitRequired

    New one- and two-family dwellings covered by Wisconsin’s Uniform Dwelling Code, including covered additions and alterations.

    • The cited brochure states that permit requirements for alterations and additions vary by municipality.
    • Construction begins only after plans are approved and the building permit is issued and posted.
    • The enforcing jurisdiction may be the municipality, county, or state.
    • Local zoning, land-use, floodplain, sanitary, well, driveway, utility, and other approvals may also be required.
    • A building permit cannot be issued for a new dwelling using a private onsite wastewater treatment system until a sanitary permit has been issued.
    “Begin construction after plans are approved and building permit is issued and posted.”
    2 more reviewed findings on this topic
    • Required — New one- and two-family dwelling units in Wisconsin, including stick-built, modular, and manufactured home installations.
      “A permit under the UDC is required for new one- and two-family dwelling units. This includes stick-built, modular, and manufactured home installations.”
    • Required — New one- and two-family dwelling units, including stick-built, modular, and manufactured-home installations.
      “A permit under the UDC is required for new one- and two-family dwelling units. This includes stick-built, modular, and manufactured home installations.”
  • Owner-builder exemptionConditional

    An owner obtaining construction and erosion-control permits for a dwelling covered by the Wisconsin Uniform Dwelling Code.

    • The owner must occupy the home currently or will occupy it after completion.
    • The exemption permits the owner to take out the construction and erosion-control permits without the state-certified Dwelling Contractor and Dwelling Contractor Qualifier arrangement described for contractors.
    • The owner-occupancy statement must be checked on the permit application if the applicant does not possess Dwelling Contractor certification.
    • The source describes an owner-occupancy condition; it does not establish a general exemption for non-occupant owners.
    “The construction and erosion control permits must be taken out by a state-certified Dwelling Contractor, who also employs a state-certified Dwelling Contractor Qualifier, or by the owner who occupies the home currently or will after completion.”
    3 more reviewed findings on this topic
    • Available (with conditions) — An owner-occupant applying for an erosion-control or construction permit for the dwelling the owner will occupy.
      “I vouch that I am or will be an owner-occupant of this dwelling”
    • Available (with conditions) — Owner-occupants applying for a Wisconsin UDC erosion-control or construction permit without a Dwelling Contractor Certification.
      “Only check this box if the permit is being issued to the property owner who will occupy the home upon completion of construction.”
    • Available (with conditions) — An owner-occupant applying for an erosion-control or construction permit for the dwelling.
      “You will leave those areas blank. At Step 5, you will check the box above your electronic signature which states “I vouch that I am or will be an owner-occupant of this dwelling for which I am applying for an erosion control or construction permit without a Dwelling Contractor Certification and have read the cautionary statement regarding contractor responsibility on the reverse side of the last ply of this form.””
  • Building code adoptedAdopted (with conditions)

    Public buildings, places of employment, and multifamily buildings subject to Wisconsin's commercial building code.

    • The Division of Industry Services reviews plans before construction for compliance with state statutes and building codes.
    • Local certified municipalities may provide plan review and inspection services for certain building types.
    • The Wisconsin Commercial Building Code adopted the 2021 ICC effective September 1, 2025; plans submitted November 1, 2025 or later must comply with the updated code.
    • Municipalities may have grandfathered fire detection, prevention, and suppression ordinances under 2013 Act 270.

    2021 ICC adoption date: September 1, 2025 (The deadline for building plan compliance was delayed.) · updated-code plan-submission deadline: November 1, 2025 (Plans submitted on or after this date must comply with the updated Commercial Building Code.)

    “2013 Act 270 establishes a uniform commercial building code in Wisconsin while allowing municipalities to grandfather fire detection, prevention, and suppression ordinances”
    6 more reviewed findings on this topic
    • Adopted (with conditions) — New one- and two-family dwellings in Wisconsin, including Sauk County.
      “It is a uniform building code that applies across the state.”
    • Adopted (with conditions) — One- and two-family dwellings in Wisconsin, including Sauk County municipalities.
      “The Uniform Dwelling Code (UDC) is the statewide building code”
    • Adopted (with conditions) — New one- and two-family dwellings in Sauk County under Wisconsin's Uniform Dwelling Code.
      “The Uniform Dwelling Code (UDC) is the statewide building code for one- and two-family dwellings built since June 1, 1980.”
    • Adopted (with conditions) — New one- and two-family dwellings in Wisconsin built since June 1, 1980.
      “The Uniform Dwelling Code (UDC) is the statewide building code for one- and two-family dwellings built since June 1, 1980.”
    • Adopted (with conditions) — New Wisconsin one- and two-family dwelling construction, including stick-built, modular, and manufactured home installations
      “A permit under the UDC is required for new one- and two-family dwelling units. This includes stick-built, modular, and manufactured home installations.”
    • Adopted — Wisconsin's Uniform Dwelling Code, chapters SPS 320-325, for new one- and two-family dwelling units, including stick-built, modular, and manufactured home installations.
      “SPS 320-325 Uniform Dwelling Code (UDC), construction standard for 1-2 family dwelling units, applies uniformly statewide”
  • InspectionsRequired

    Each phase of construction of a one- or two-family dwelling governed by the Wisconsin Uniform Dwelling Code.

    • Inspections are called for before each phase is covered up.
    • The local inspector’s instructions apply.
    • The inspector has two business days after the inspection request and the work being ready to inspect before the work may be covered.
    • Inspections check compliance with the code and may also check compliance with approved plans.
    • The UDC is enforced by municipal or county building inspection departments or the Wisconsin Division of Industry Services.

    inspection response period: 2 business days (After the inspection request and the work is ready to inspect, before the work may be covered up.)

    “Call for inspections of each phase of construction prior to covering it up - check the local inspector’s instructions. The inspector has two business days after the date that you make the inspection request and the work is ready to inspect, before you may cover up the work. Inspectors will check for compliance with the code.”
    2 more reviewed findings on this topic
    • Required — UDC inspection administration for one- and two-family dwellings in Wisconsin, including Sauk County.
      “Each local municipality in Sauk County contracts with it's own private building inspector.”
    • Required — New one- and two-family dwellings.
      “The following inspections are required on new one- and two-family dwellings. When ready for inspection, notify the inspector identified on your UDC permit.”
  • Certificate of occupancyLimited

    Occupancy of a dwelling governed by Wisconsin’s Uniform Dwelling Code after construction.

    • Occupancy follows a final inspection in which no major health or safety violations are found.
    • Some municipalities will issue occupancy permits; the state source does not state that every municipality must issue a certificate or occupancy permit.
    • The dwelling exterior must be completed within two years after permit issuance.

    exterior completion deadline: 2 years after permit issuance

    “Take occupancy after receiving a final inspection in which no major health or safety violations are found. (Some municipalities will issue occupancy permits.) Also, the dwelling’s exterior must be completed within two years after permit issuance.”
  • Minimum lot sizeSpecified

    Statewide minimum shoreland standards for unincorporated land within 1,000 feet of a navigable lake, flowage, or pond, or within 300 feet of a navigable stream or the landward side of a floodplain, whichever is greater.

    • The standards must be met or exceeded in county shoreland zoning ordinances.
    • Many counties have adopted additional requirements that are not listed in the state summary.
    • Sewered lots require a minimum average width of 65 feet and minimum area of 10,000 square feet.
    • Unsewered lots require a minimum average width of 100 feet and minimum area of 20,000 square feet.

    minimum lot area: 10000 sq ft (lots served by public sanitary sewer) · minimum average lot width: 65 feet (lots served by public sanitary sewer) · minimum lot area: 20000 sq ft (lots not served by public sanitary sewer) · minimum average lot width: 100 feet (lots not served by public sanitary sewer)

    “Sewered lots must have a minimum average width of 65 feet and a minimum area of 10,000 square feet.”
  • SetbacksSpecified

    Buildings and structures in unincorporated Wisconsin shoreland zoning areas measured from the ordinary high water mark.

    • The standard applies in the shoreland zone and is implemented through county shoreland zoning ordinances.
    • Exceptions include piers, boat-hoists, fishing rafts, utilities, walkways, stairways or rail systems, decks or gazebos complying with s. 59.692(1v), and boathouses.
    • If an existing pattern of development exists, counties may allow new homes closer than 75 feet through setback averaging.
    • Counties may adopt additional requirements.

    minimum setback from ordinary high water mark: >= 75 feet (Listed structures and setback averaging exceptions.)

    “All buildings and structures must be set back at least 75 feet from the ordinary high water mark.”
  • Lot coverageSpecified

    Impervious-surface coverage in the statewide shoreland framework and the DNR county model ordinance for qualifying shoreland lots or parcels.

    • The general standard applies to construction, reconstruction, expansion, replacement, or relocation of impervious surfaces within 300 feet of the ordinary high-water mark on riparian lots and parcels entirely within 300 feet of the ordinary high-water mark.
    • The general standard is 15 percent.
    • A lot or parcel may exceed 15 percent but not exceed 30 percent with a permit and mitigation plan.
    • For highly developed shorelines, counties are not required to adopt the special standards; if adopted, residential coverage may exceed 30 percent but not exceed 40 percent with a mitigation plan.
    • Treated impervious surfaces and defined roadways and sidewalks may be excluded from calculation when the ordinance conditions are met.

    general impervious-surface limit: <= 15 percent of lot or parcel · maximum under general standard with mitigation: 30 percent of lot or parcel (permit and mitigation plan required) · highly developed shoreline residential maximum: 40 percent of lot or parcel (special standard adopted and mitigation plan required)

    “The percentage of impervious surface allowed on a lot or parcel described under section 11.2 and as calculated under section 11.3 shall not exceed 15%.”
  • Building heightSpecified

    Structures within 75 feet of the ordinary high water mark of navigable waters in Wisconsin shoreland zoning areas.

    • The DNR model ordinance identifies this as the NR 115.05(1)(f) height standard for county shoreland ordinances.
    • The prohibition does not extend beyond 75 feet from the ordinary high water mark under the stated standard.
    • Counties may regulate height beyond 75 feet through local ordinance.

    maximum structure height within 75 feet of ordinary high water mark: <= 35 feet (A structure taller than 35 feet is prohibited within the specified area.)

    “A structure taller than 35 feet within 75 feet of the ordinary high-water mark of any navigable waters is prohibited”
  • Manufactured homesAllowed (with conditions)

    Occupancy of a manufactured home installed as a new one- or two-family dwelling in Wisconsin.

    • The Uniform Dwelling Code applies to new one- and two-family dwellings built since June 1, 1980.
    • The UDC includes manufactured homes and the installation of manufactured homes produced on or after April 1, 2007.
    • Occupancy follows a final inspection in which no major health or safety violations are found.
    • Some municipalities issue occupancy permits.
    • The dwelling exterior must be completed within two years after permit issuance.
    • Local sanitary requirements may require certain plumbing systems.
    • Local zoning and land-use requirements may also apply.

    UDC coverage start date: >= 1980-06-01 date (The cited coverage is for new one- and two-family dwellings and their additions and alterations.) · manufactured-home installation coverage start date: >= 2007-04-01 date · exterior completion deadline: <= 2 years after permit issuance

    “The installation of manufactured homes produced on or after April 1, 2007.”
  • Septic inspectionRequired

    Privately owned wastewater treatment systems and septic systems statewide in Wisconsin.

    • Systems must be visually inspected at least once every three years.
    • Anaerobic treatment tanks must be serviced when combined sludge and scum volume reaches one-third of tank volume.
    • Counties, acting as state agents, operate maintenance-tracking programs and send reminders to landowners.

    visual inspection interval: <= 3 years · combined sludge and scum service threshold: >= 33.333333 percent of tank volume (One-third of tank volume.)

    “The code only requires that systems shall be visually inspected at least once every 3 years.”
  • Off-grid sanitationLimited

    Sanitation for buildings with plumbing fixtures that are not connected to a public sewer in Wisconsin.

    • Off-grid wastewater handling must provide for treating, recycling, dispersing, or holding wastewater.
    • Private onsite wastewater treatment systems remain subject to Wisconsin POWTS requirements and applicable plan review or permits.
    • The rule does not establish unrestricted approval for any particular composting toilet, privy, holding tank, or other device.
    “Where plumbing fixtures exist in a building that is not connected to a public sewer system, suitable provision shall be made for treating, recycling, dispersing or holding the wastewater.”
  • Well permitLimited

    Construction of private wells statewide in Wisconsin.

    • A Well Construction Notification Number must be obtained before constructing a new private well that is not a high-capacity well.
    • Exceptions to the notification requirement include high-capacity wells, reconstruction of existing wells, and wells on Native American property; high-capacity wells or other wells requiring written DNR approval follow the approval requirements.
    • Some DNR-approved county ordinances additionally require a well permit before construction.
    • A Well Construction Report must be submitted to DNR within 30 days after construction.

    well construction notification fee: 50.5 USD (Fee and notification number are not refundable or transferable.) · well construction report deadline: 30 days after construction

    “Wisconsin law requires that a property owner provide advance notice to DNR before construction of any new private well that is not a high capacity well, and advance notice of any heat exchange drillhole construction (geothermal system) that does not require a written DNR approval.”
  • Mandatory utility hookupWater and sewer (with conditions)

    Pre-installation water and sewer systems in a manufactured/mobile home park in Wisconsin.

    • Pre-installation plumbing-system plan review is required.
    • Submitted plans must comply with the Wisconsin Plumbing Code.
    • A conditional approval letter gives permission to start construction.
    • Local permitting requirements remain pending.
    “Pre-installation plan review of the water and sewer systems in a manufactured/mobile home park is required as a plumbing system plan review via esla.wi.gov.”
  • Agricultural exemptionConditional

    Wisconsin farmland preservation zoning districts and farmland preservation agreements; these are conditional agricultural-use protections and tax-credit frameworks, not a blanket exemption from local land-use or land-division ordinances.

    • Certified farmland preservation zoning districts limit land uses to agriculture and other compatible uses.
    • Local ordinances are crafted locally and must meet or be more restrictive than Chapter 91 standards.
    • A farmland preservation agreement requires land to remain in agricultural use for 10 years and comply with state soil and water conservation standards.
    • Agreement eligibility requires ownership of the farmland, location in a designated Agricultural Enterprise Area, at least $6,000 gross farm revenue during the last year or $18,000 during the last three years, and compliance with applicable conservation standards.
    • A certificate of compliance from the county land conservation committee is required to show compliance.
    • Other local zoning and land-division ordinances continue to apply.
    • A covered agreement provides exemption from special assessments for sanitary sewer or water imposed by specified local governmental entities.
    • Releases before expiration require written consent, a DATCP finding that agricultural use of other protected farmland will not be impaired, and payment of the specified conversion fee.

    farmland preservation agreement term: 10 years (agreements effective before December 8, 2023, were minimum 15-year agreements) · minimum gross farm revenue during last year: >= 6000 USD (alternative test of $18,000 during the last three years) · minimum gross farm revenue during last three years: >= 18000 USD (alternative to the $6,000 last-year test) · tax credit: $10.00 per acre or $12.50 per acre if also in a certified farmland preservation zoning district (other eligibility requirements apply)

    “Remember that other local ordinances (such as zoning and land division ordinances) continue to apply to your land, regardless of whether you sign an agreement.”
  • Driveway accessRequired

    A new or altered driveway or other connection to a state trunk highway and work in state highway right-of-way.

    • WisDOT issues permits on state highways under its jurisdiction; county highways and municipal roads may be subject to county or municipal permitting instead.
    • The number of driveways serving a single state-trunk-highway frontage must be the minimum deemed necessary for reasonable service without undue impairment of safety, convenience, and utility.
    • A controlled-access designation or other access restriction may require a different application or prevent the connection.
    • A residential connection may be limited to 24 feet wide and a commercial connection to 35 feet wide at the right-of-way line.

    residential connection maximum width: 24 feet at right-of-way line · commercial connection maximum width: 35 feet at right-of-way line

    “So, a permit is required from WisDOT before you construct a new connection to your property. [...] Why can my connection only be 24 feet wide (residential) or 35 feet wide (commercial)? [...] These distances are measured at the right-of-way line.”
    2 more reviewed findings on this topic
    • Required — Driveways and other connections between property abutting Wisconsin state highway right-of-way and the state highway.
      “For state highways, WisDOT requires a connection permit.”
    • Limited — Multiple driveway connections serving one property frontage along a Wisconsin state trunk highway.
      “The number of driveways permitted serving a single property frontage along a state trunk highway shall be the minimum deemed necessary by the department for reasonable service to the property without undue impairment of safety, convenience, and utility of the highway.”
  • Short-term rentalsLimited

    Lodging rented to tourists or transients for short periods in Wisconsin, including homes, condos, cabins, cottages, and similar lodging facilities.

    • A DATCP lodging permit is required for all lodging facilities in Wisconsin.
    • A tourist or transient must be away from the person's permanent address.
    • The reviewed source does not establish local zoning or municipal operating restrictions.
    “If lodging is rented to a tourist or transient, it will require a permit.”
  • Campground & park staysLimited

    Recreational trailers, pickup truck campers, and motor homes occupying campsites in Wisconsin State Park System family campgrounds.

    • Camping reservations are required before setting up on any site.
    • A campsite may contain no more than one recreation trailer, pickup truck camper, or motor home.
    • No person may camp or leave a camping unit in a family campground for more than 14 days in any 21 days.
    • Pickup campers or motor homes pulling a trailer are treated as a single unit.

    maximum camping-unit occupancy per campsite: 1 recreation trailer, pickup truck camper, or motor home (Pickup campers or motor homes pulling a trailer are treated as a single unit.) · maximum stay: 14 days in any 21 days

    “A campsite may be occupied by no more than one recreation trailer, pickup truck camper or motor home. Pickup campers or motor homes pulling a trailer are treated as a single unit. [...] No one may camp or leave a camping unit in a family campground for more than 14 days in any 21 days.”
    3 more reviewed findings on this topic
    • Limited — Occupancy of recreational vehicles, including recreation trailers, pickup truck campers, motor homes, camper vans, and truck campers, at Wisconsin State Park System campsites.
      “A campsite may be occupied by no more than one recreation trailer, pickup truck camper or motor home. Pickup campers or motor homes pulling a trailer are treated as a single unit.”
    • Limited — Temporary camping at Wisconsin State Park System properties.
      “Camping reservations are required and can be made up to 11 months in advance of your planned date of occupancy. Campers must make a reservation before setting up on any site.”
    • Limited — Temporary camping in Wisconsin State Park System family campgrounds.
      “Camping reservations are required and can be made up to 11 months in advance of your planned date of occupancy. Campers must make a reservation before setting up on any site. [...] No one may camp or leave a camping unit in a family campground for more than 14 days in any 21 days. [...] Not all properties offer camping during non-summer months. Camping seasons vary by property.”
  • county zoning authorityGeneral

    Wisconsin counties may enact and amend county zoning ordinances under Wis. Stat. § 59.69 for participating towns, which are generally unincorporated areas.

    • County zoning applies only in towns that have adopted county zoning.
    • After a comprehensive revision of the county zoning ordinance, the town has authority to decide whether county zoning applies in the town.
    • Towns have authority to approve or disapprove amendments to a county zoning ordinance.
    • A town that does not fall under county zoning may be unzoned or may have its own town zoning ordinance.
    “Counties exercise zoning ordinances under s. 59.69, Wis. Stats. County zoning only applies in towns that have adopted county zoning.”
  • county building authorityGeneral

    Wisconsin county authority to administer construction and inspection of new one- and two-family dwellings, including in unincorporated areas, through the UDC delegation and inspection framework.

    • Counties must have delegated authority to exercise UDC jurisdiction.
    • A county with delegated authority has jurisdiction over new one- and two-family dwellings in cities, villages, and towns that do not have their own delegated authority.
    • The DSPS page directs applicants to the municipality when it has delegated authority and otherwise to DSPS or the appointed county inspector.
    • The authority described is for construction and inspection under the statewide UDC; local zoning, land-use, sanitary, floodplain, and other requirements may still apply.

    covered construction: new one- and two-family dwellings (Jurisdiction depends on DSPS delegation and whether the municipality has its own delegated authority.)

    “Counties: Counties with delegated authority have been authorized jurisdiction over the construction and inspection of new one- and two-family dwellings in cities, villages, and towns which do not have their own delegated authority.”
    2 more reviewed findings on this topic
    • General — County authority to enforce the statewide Uniform Dwelling Code and administer building inspection and permitting for new one- and two-family dwellings in Wisconsin, including unincorporated areas where the county is the responsible inspection authority.
      “The UDC is primarily enforced by municipal or county building inspectors who must be state-certified. In lieu of local enforcement, municipalities have the option to have the state provide enforcement for just new homes.”
    • Limited — County enforcement of Wisconsin’s Uniform Dwelling Code for new one- and two-family dwellings in municipalities, including towns, that do not have their own delegated authority
      “Counties: Counties with delegated authority have been authorized jurisdiction over the construction and inspection of new one- and two-family dwellings in cities, villages, and towns which do not have their own delegated authority.”

Set by your township or city, not the county

In Wisconsin, zoning is adopted by each township or city, so Sauk County has no county-wide answer on these. Find your township or city in the list of places on this page, or call its clerk or zoning administrator.

  • Minimum dwelling size
  • Tiny homes
  • Accessory dwellings

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Sauk County, Wisconsin

Is Sauk County a good place to live off-grid or homestead?

Sauk County scores 60/100 on the Bolthole Index, a solid county profile. Its strengths: a stronger property-autonomy legal backdrop and 20 operating mines. Watch-outs: about 67,801 people within a 30-minute drive.

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

Sauk County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Sauk County Land Resources and Environment Department (Planning & Zoning). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Sauk County?

Living in an RV on your own land in Sauk County is allowed on a temporary basis only: Recreational vehicles and other camping units used for human habitation in unincorporated areas subject to the Sauk County Chapter 7 zoning ordinance. At a campground, a camping unit may not be occupied for more than 240 days in a calendar year; separate stays are combined. Continuous year-round occupancy and use as a permanent abode or legal place of residence are prohibited. Confirm with the county before relying on it.

How much does land cost in Sauk County, Wisconsin?

Land in Sauk County runs about $6,278 per acre, based on the latest county data.

What is the water situation in Sauk County?

Sauk County gets about 37.1" of rain a year, with severe drought in roughly 8.1% of years.

How remote is Sauk County?

A representative private-land location has about 67,801 people within a 30-minute drive and 3,857,372 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Sauk compares in Wisconsin

Compare side-by-side →See all 72 Wisconsin counties ranked →