Bolthole Index

Washington County, Wisconsin

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

47Index Score / 100
#64 of 72 in Wisconsin

A new one- or two-family home in unincorporated Washington County, Wisconsin needs a building permit under the statewide Uniform Dwelling Code, issued by the municipality where authority is delegated and otherwise by Wisconsin DSPS12. General zoning comes from the town, village or city, while the county keeps shoreland, wetland and floodplain zoning34. Septic permits for every address, city or not, come from the county56.

At a glance

Building permit
Required for a new one- or two-family dwelling; apply locally where authority is delegated, otherwise to DSPS2
General zoning
Set by the town, village or city; Washington County does not administer general zoning3
County zoning
Shoreland, wetland and floodplain zoning applies in specified unincorporated areas4
Septic permit
State or county sanitary permit required, depending on the septic work7
Owner-builder
An owner-occupant may obtain construction and erosion-control permits8
RV living
Countywide private-land rule not confirmed; ask the local zoning authority9
Private well
Advance DNR notification generally applies to a new non-high-capacity well10
Minimum home size
Washington County sets none in unincorporated areas; the town, village or city may11

Who to call

Planning & zoning

Washington County Natural Resources Department — Land Resources

County sanitary, erosion-control and stormwater applications and Land Resources questions

(262) 335-4445

landres@washcowisco.gov

333 E. Washington Street, Suite 2300 P.O. Box 2003 West Bend, WI 53095-2003

Online permits →

Roads & driveways

Washington County Highway Department

Access permits for driveways, culverts and roads within County Trunk Highway right-of-way

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Off-grid gear

Going off-grid in Washington 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 Washington County, Wisconsin?

Yes. New one- and two-family homes in Washington County, including stick-built, modular and manufactured-home installations, require a building permit under Wisconsin's Uniform Dwelling Code112. Apply to the municipality when it has delegated building-permit authority; otherwise submit the application to Wisconsin DSPS with the plans, contractor-license information, required data and fee2. Requirements for additions and alterations vary by municipality, and construction begins only after plans are approved and the building permit is issued and posted2. County sanitary, erosion-control, stormwater or floodplain approval may also be required before work begins13.

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

Washington County does not have one building-permit office for every parcel. Apply through the municipality when it has delegated Uniform Dwelling Code building-permit authority; otherwise submit the application to Wisconsin DSPS2. The Village of Richfield14, the Town of Trenton15 and the Town of Addison16 run their own building-permit offices; the county's rules here apply to unincorporated land. For any other town, village or city, ask who its certified building inspector is. Building-permit authority does not move septic work: Washington County issues sanitary permits and performs septic inspections countywide56. For county sanitary, erosion-control, stormwater, shoreland, wetland or floodplain questions, contact County Land Resources17. County applications are not all available online, and the county advises allowing several weeks for approvals13.

Does Washington County have zoning?

Washington County does not administer general zoning in unincorporated areas, so the parcel's town, village or city controls uses and setbacks318. Zoning of their own is confirmed in the Village of Richfield19, Village of Slinger20, Village of Newburg21, Town of Trenton22, Town of Polk23, Town of Addison24 and Town of Barton25. County GIS also publishes zoning-district maps for the villages of Germantown26, Kewaskum27 and Richfield28 and the Town of West Bend29, but each municipality is the zoning authority and supplies the standards30. Washington County separately administers shoreland, wetland and floodplain zoning in specified unincorporated areas31. With no county general zoning, the county sets no minimum dwelling size in unincorporated areas; ask the municipality whether it does11. In a shoreland zone, buildings generally need a setback of 75 feet from the ordinary high-water mark, subject to exceptions and averaging32.

How do septic permits work in Washington County?

Private onsite wastewater work in Washington County requires the applicable sanitary permit: the state permit covers installation or a major modification or addition, while the county permit covers reconnection, privies, minor repairs and components outside state permit requirements7. Washington County issues county sanitary permits and inspects septic installations countywide, while state approval is required first for some systems56. County rules require domestic waste to go to an approved POWTS, restrict privies and generally prohibit holding tanks except in listed circumstances33. Only 15.4% of mapped soils lack severe limits for a conventional drain field, so obtain a site evaluation before treating a parcel as conventionally buildable34. Current sanitary-permit fees are published but vary by project35.

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

We could not confirm a countywide private-land RV occupancy rule in Washington County, so ask the parcel's town, village or city about RV use3. The county's only confirmed RV rule covers campgrounds in floodplain districts: a camping unit may stay no more than 180 consecutive days before it must leave the floodplain for 24 hours, and stays beyond 30 days need the operator's written authorization36. That rule governs licensed campgrounds, not an RV on your own lot. A tiny home used as a covered new one- or two-family dwelling falls under Wisconsin's Uniform Dwelling Code37. In the county-regulated floodplain, a tiny home used as a dwelling is prohibited in the floodway and conditional in the floodfringe, general floodplain and flood-storage districts38394041. Ask County Land Resources which mapped district applies before choosing a site17. Off-grid living does not bypass sanitation rules: domestic waste must enter an approved POWTS, and county rules restrict privies and holding tanks33.

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

  1. Identify the municipality and ask its zoning office which local uses and setbacks apply318.
  1. Ask County Land Resources about county shoreland, wetland, floodplain, erosion-control and stormwater approval1317.
  1. For private wastewater, obtain the applicable county or state sanitary permit before the building permit742.
  1. Apply for the building permit through the municipality when it has delegated authority; otherwise apply to Wisconsin DSPS2.
  1. Call for an inspection of each construction phase before covering the work; the inspector has two business days after your request to inspect, and the county notes enforcement may be by a municipality, county or the state43.
  1. Occupy only after a final inspection finds no major health or safety violations44.

What should you check before buying land in Washington County?

Confirm the municipality and zoning authority first because Washington County does not administer general zoning countywide3. A proposed land division may need township and extraterritorial approval as well as county review45. County approval applies when a plat creates 5 or more parcels of 1.5 acres or less within 5 years, or 3 or more parcels of 5 acres or less in the county shoreland area within 5 years; those are review thresholds, not a universal minimum lot size46. Check county mapping for shoreland, wetland and floodplain constraints, and contact Land Resources before work in a mapped floodplain4717. Order a septic site evaluation because only 15.4% of mapped soils lack severe limits for a conventional drain field34. If access touches a County Trunk Highway, apply for the county access permit before installing the driveway4849.

Watch-outs

  • A town or village inside Washington County may issue its own building permits and set its own zoning, so confirm the municipality before relying on county rules3.
  • Washington County does not administer general zoning countywide; confirm parcel-specific RV use, tiny-home standards and local setbacks with the municipality318.
  • A new dwelling using private wastewater cannot receive its building permit until the sanitary permit is issued42.
  • A new driveway in County Trunk Highway right-of-way requires the county access-permit process48.

Sources

  1. One- & Two-Family Uniform Dwelling Code, quoted and re-checked
  2. Wisconsin’s Uniform Dwelling Code, quoted and re-checked
  3. County Land Information Plan 2024, quoted and re-checked
  4. County Land Information Plan Instructions 2024, quoted and re-checked
  5. Septic Systems/POWTS, quoted and re-checked
  6. Chapter 190: Private On-Site Wastewater Treatment Systems (POWTS), quoted and re-checked
  7. Chapter 190: Private On-Site Wastewater Treatment Systems (POWTS), quoted and re-checked
  8. Instructions for Submitting a UDC Permit Application, quoted and re-checked
  9. Washington County Land Information Plan 2024, quoted and re-checked
  10. Well and heat exchange notification (Wisconsin statewide rule), quoted and re-checked
  11. County Land Info Plan Instructions 2024, quoted and re-checked
  12. UDC (Uniform Dwelling Code / One- and Two-Family Dwellings), quoted and re-checked
  13. Permits, Applications, and Grants, quoted and re-checked
  14. Village of Richfield: Article I: General Construction Regulations (Washington County), quoted and re-checked
  15. Town of Trenton: Chapter 174: Building Construction (Washington County), quoted and re-checked
  16. Town of Addison: Chapter 158: Building Construction - Town of Addison, WI (Washington County), quoted and re-checked
  17. Washington County Natural Resources Department — Land Resources (permitapp.washcowisco.gov)
  18. Washington County Land and Water Resource Management Plan, quoted and re-checked
  19. Village of Richfield: Chapter 170A: Zoning Appendix (Washington County), quoted and re-checked
  20. Village of Slinger: Article III: Zoning Districts - Village of Slinger, WI (Washington County), quoted and re-checked
  21. Village of Newburg: official source (Washington County), quoted and re-checked
  22. Town of Trenton: Town of Trenton, WI Code of Ordinances (Washington County), quoted and re-checked
  23. Town of Polk: Town of Polk Chapter 17 Zoning Regulations (Washington County), quoted and re-checked
  24. Town of Addison: Chapter 350: Zoning - Town of Addison, WI (Washington County), quoted and re-checked
  25. Town of Barton: official source (Washington County), quoted and re-checked
  26. Washington County Land Information Plan 2024, quoted and re-checked
  27. Washington County Land Information Plan 2024, quoted and re-checked
  28. Washington County Land Information Plan 2024, quoted and re-checked
  29. Washington County Land Information Plan 2024, quoted and re-checked
  30. County Land Information Plan Instructions 2024, quoted and re-checked
  31. washcowisco.gov, quoted and re-checked
  32. Wisconsin’s Shoreland Management Program (Wisconsin statewide rule), quoted and re-checked
  33. Chapter 190: Private On-Site Wastewater Treatment Systems (POWTS), quoted and re-checked
  34. 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
  35. Septic Systems/POWTS, quoted and re-checked
  36. Washington County Code, Chapter 275, Article IV: Floodplain Zoning, quoted and re-checked
  37. One- & Two-Family (Uniform Dwelling Code) (Wisconsin statewide rule), quoted and re-checked
  38. Article IV: Floodplain Zoning - Washington County, WI, quoted and re-checked
  39. Article IV: Floodplain Zoning - Washington County, WI, quoted and re-checked
  40. Article IV: Floodplain Zoning - Washington County, WI, quoted and re-checked
  41. Article IV: Floodplain Zoning - Washington County, WI, quoted and re-checked
  42. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  43. Wisconsin’s Uniform Dwelling Code, quoted and re-checked
  44. Wisconsin’s Uniform Dwelling Code, quoted and re-checked
  45. Land Division, quoted and re-checked
  46. Land Division, quoted and re-checked
  47. Permits, Applications, and Grants, quoted and re-checked
  48. Permits, quoted and re-checked
  49. Washington County Highway Department (washcowisco.gov)

Written October 16, 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

Unlike 5 of its 6 neighbors, Washington County has no countywide zoning.

RuleWashington CountyOzaukee CountyDodge CountyMilwaukee CountyWaukesha CountySheboygan CountyFond du Lac County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningNoYesYesYesYesYesNo
Septic permitsCounty Land Resources Div.County Land & Water Management Dept.County Land Resources & Parks Dept.Not publishedCounty Dept. of Parks & Land UseCounty Planning & Conservation Dept.County Land Information Dept.

County locator

Washington County in Wisconsin

47
County map
Washington County highlighted among the Wisconsin counties · colored by Index score

How Washington County scores

Seclusion16100% ev.
Self-Sufficiency62100% ev.
Admin Boringness44100% ev.
Durability79100% ev.
Property Autonomy70100% ev.
Carry Cost50100% 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 →

$434kTypical home
1.2%Property tax
$9,471Land / acre
34"Annual rain
1.6% of yrsSevere drought
1.1 / yr (+1)Mid-century 100°F days
13.4 daysMid-century dry spell
1.71" (+6.4%)Mid-century 1-day rain
1.64×Wildfire change factor
100%Forward climate coverage
$1,228Home insurance / yr
1.5% / yrInsurance growth
0.53%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
226,137People within 30 min
6,132,100People within 2 hr
210,904Radius comparison (15 mi)
320.8People / sq mi
0%Federal land
87.3%Land at 15% slope or less
15.4%Soils rated "not limited" for septic (strict USDA rating)
41,510 acWorkable land screen
32.6%Wooded land
39.5 tonsBiomass / forest ac
45.8°FAvg temp

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Cities and towns in Washington 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: Town of Erin · Town of Farmington · Town of Germantown · Village of Germantown · Hartford · Town of Hartford · Town of Jackson · Village of Jackson · Town of Kewaskum · Village of Kewaskum · Town of Wayne · West Bend · Town of West Bend

Answers from the rulebook for Washington County

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

Washington County rules

  • County-wide zoningAbsent (with conditions)

    County general zoning in Washington County unincorporated areas.

    • Washington County does regulate shoreland, wetland, and floodplain areas under separate county authority.
    • Municipal zoning rules may apply.
    • This claim does not establish permission under state, municipal, shoreland, wetland, or floodplain rules.
    “County General Zoning Layer Status • Not regulated by Washington County”
  • Zoning districtsPartial

    Washington County zoning districts and zoning-map coverage.

    • Washington County does not administer general zoning countywide.
    • The county administers shoreland, wetland, and floodplain zoning in unincorporated areas.
    • County shoreland zoning maps cover unincorporated areas; the county lacks regulatory authority and GIS representation for incorporated areas for this county layer.
    • Through intergovernmental agreements, the county maintains general zoning data for the Village of Germantown, Village of Kewaskum, Village of Richfield, and Town of West Bend, with standards belonging to those local governments.
    “County General Zoning Layer Status • Not regulated by Washington County Shoreland Zoning Layer Status • Washington County maintains a GIS representation of county shoreland zoning boundaries • The layer is 100% complete for the unincorporated areas of the county. • Washington county does not have regulatory authority for the incorporated areas of the county and does not maintain a GIS representation for these areas.”
    3 more reviewed findings on this topic
    • Partial — County-administered shoreland, wetland, and floodplain zoning districts in unincorporated Washington County.
      “Not regulated by Washington County Shoreland Zoning Layer Status [...] The layer is 100% complete for the unincorporated areas of the county.”
    • Published (with conditions) — General zoning district maps maintained by Washington County through intergovernmental agreements for the Village of Germantown, Village of Kewaskum, Village of Richfield, and Town of West Bend.
      “Washington County publishes nearly all its data through ArcGIS Server [...] Washington County maintains parcel based general zoning information for several municipalities in Washington County.”
    • Partial — County shoreland, wetland, and floodplain zoning districts in unincorporated Washington County.
      “The County Shoreland/Wetland/Floodplain Zoning Ordinance pertains to properties within 300' of a river or navigable stream, within 1,000' of a lake/pond as well as all floodplain and the wetland areas within.”
  • Minimum dwelling sizeNone

    County general-zoning regulation of minimum dwelling size in Washington County's unincorporated areas.

    • Washington County's statement concerns county general zoning only.
    • Washington County still administers shoreland, floodplain, and wetland zoning in unincorporated areas; those special-purpose rules may impose other development controls.
    • Town, city, and village ordinances may apply depending on the parcel's municipal jurisdiction.
    • State building, sanitation, septic, and other applicable requirements remain applicable.
    “Washington County does not administer any general zoning and only administers shoreland/floodplain/wetland zoning in the unincorporated areas of the county.”
  • Minimum lot sizeSpecified

    County subdivision and land-division review in Washington County.

    • County approval is required for subdivision plats creating five or more parcels of 1.5 acres each or less within a five-year period.
    • County approval is also required for three or more parcels of 5 acres each or less in the county shoreland area within a five-year period.
    • The township must also approve a land division; city or village extraterritorial platting authority may also apply.
    • Where a township has adopted a subdivision-control ordinance, the county provisions apply where more restrictive.
    • Since 2023, Washington County no longer reviews plats in villages and cities, except that soil tests in specified private-onsite-wastewater areas of the Villages of Richfield and Germantown must be submitted to county land-use inspectors.

    subdivision threshold: 5 parcels of 1.5 acres each or less within 5 years · shoreland subdivision threshold: 3 parcels of 5 acres each or less within 5 years

    “County approval is required for all subdivision plats creating: 1. Five or more parcels of 1.5 acres each or less in area within a 5-year period, or 2. Three or more parcels of 5 acres each or less in area in the County's Shoreland Area within a 5-year period.”
  • SetbacksNone (with conditions)

    County general-zoning setbacks in unincorporated Washington County.

    • Local zoning may impose setbacks.
    • Special-purpose county rules may impose setbacks, including shoreland and wetland rules.
    “only administers shoreland/floodplain/wetland zoning”
  • Living in an RVTemporary only (with conditions)

    Mobile recreational vehicle occupancy in public or private campgrounds located in Washington County floodplain zoning districts.

    • The campground must have low flood damage potential.
    • The campground must obtain the necessary approvals from the Wisconsin Department of Agriculture, Trade and Consumer Protection.
    • The campground must obtain a County land use permit.
    • The river-system character and campground elevation must allow 72-hour warning of an impending flood to all campground occupants.
    • The campground must maintain an adequate flood-warning and evacuation procedure, including a written agreement with the County Emergency Management Coordinator and Sheriff; the agreement may not exceed one year and must be reviewed and updated at least annually.
    • Only camping units or mobile recreational vehicles that are fully licensed, if required, and ready for highway use are allowed; the vehicle must be on its wheels or jacking system, attached only by quick-disconnect utilities and security devices, and have no permanently attached additions.
    • A camping unit may not occupy a campground site for more than 180 consecutive days and must then be removed from the floodplain for at least 24 hours.
    • Camping units remaining more than 30 days require a written limited authorization from the campground operator for no more than 180 days.
    • Units remaining more than 180 consecutive days must meet the applicable requirements for the floodplain district under §§ 275-15 through 275-18.
    • Campground entrances must display flood-hazard and evacuation signs, and service facilities must be anchored and elevated or floodproofed to the flood protection elevation.

    maximum campground occupancy duration: <= 180 consecutive days (After 180 consecutive days, the camping unit must be removed from the floodplain for a minimum of 24 hours.) · minimum removal period: >= 24 hours · limited authorization threshold: > 30 days (Written limited authorization is required.)

    “Camping units shall not occupy any site in the campground for more than 180 consecutive days, at which time the camping unit must be removed from the floodplain for a minimum of 24 hours. [...] All camping units that remain in place for more than 180 consecutive days must meet the applicable requirements in either § 275-15, or § 275-16, or § 275-17, or § 275-18 for the floodplain district in which the structure is located.”
  • Tiny homesLimited

    A tiny home used as a principal dwelling in Washington County Floodfringe District areas within the unincorporated county.

    • Any structure, land use, or development is allowed only if § 275-16C standards are met, the use is not prohibited by Chapter 275 or another ordinance or regulation, and all permits or certificates required by § 275-21 are issued.
    • A newly constructed or moved residential structure, including a manufactured home, must have its lowest floor elevated to or above the flood protection elevation on fill.
    • Fill around the structure must be one foot or more above the regional flood elevation and extend at least 15 feet beyond the structure.
    • A basement or crawlspace may be at the regional flood elevation only if watertight and designed to resist hydrostatic and hydrodynamic loads and buoyancy; no floor may be below the regional flood elevation.
    • Contiguous dryland access is required unless the stated municipal emergency-services or DNR-approved evacuation-plan exception applies.
    • General floodplain standards in § 275-14D also apply.

    fill elevation above regional flood elevation: >= 1 foot · fill extension beyond structure: >= 15 feet

    “Any structure, land use, or development is allowed in the Floodfringe District if the standards in § 275-16C are met, the use is not prohibited by this or any other ordinance or regulation and all permits or certificates specified in § 275-21 have been issued.”
    3 more reviewed findings on this topic
    • Prohibited — A tiny home used as a principal dwelling or other habitable structure in Washington County Floodway District areas within the unincorporated county.
      “Prohibited uses. All uses not listed as permitted uses in § 275-15B are prohibited, including the following uses: Habitable structures, structures with high flood damage potential, or those not associated with permanent open space uses;”
    • Limited — A tiny home used as a principal dwelling in Washington County General Floodplain District areas within the unincorporated county.
      “Those uses permitted in the Floodway (§ 275-15B) and Floodfringe (§ 275-16B) Districts are allowed within the General Floodplain District, according to the standards of § 275-17D provided that all permits or certificates required under § 275-21 have been issued.”
    • Limited — A tiny home used as a principal dwelling in Washington County Flood Storage District areas within the unincorporated county.
      “Permitted uses or developments in the Floodfringe District § 275-16C are permitted in the Flood Storage District; provided, however, that the standards of Subsection D are also met.”
  • Who permits septicMixed (with conditions)

    Private onsite wastewater treatment systems throughout Washington County.

    • Washington County issues sanitary permits and inspects installations.
    • Wisconsin statutes, administrative code, state licensing, and in some cases prior state approval also apply.
    “state approval is needed before applying for the County sanitary permit”
  • Septic permitRequired

    Installation, major modification, addition, reconnection, minor repair, or other covered work on POWTS in Washington County.

    • State sanitary permits are required for installation or major modification/addition.
    • County sanitary permits are required for reconnection, privies, minor repairs, and components outside state permit requirements.
    • Emergency repairs or stoppage removal may precede a permit if reported by the next working day and left exposed as required.
    • Sanitary permits expire two years after issuance unless revoked.
    “without first obtaining a sanitary permit”
  • Septic inspectionRequired

    POWTS, additions, sanitary privies, outdoor-toilet waste-disposal installations, and sanitary repairs.

    • Inspections must comply with Wisconsin Administrative Code SPS 383.26.
    • The County may conduct random inspections and enter premises during normal working hours as authorized by law.
    “must comply with inspection requirements”
  • Off-grid sanitationLimited

    Off-grid domestic sanitation, outdoor toilets, privies, and holding tanks.

    • All domestic wastes must be discharged to an approved POWTS.
    • Permanent outdoor toilets and privies are prohibited where public sewer is available.
    • Portable self-contained toilets may be used at construction and agricultural work sites.
    • Privies may be permitted in public or private parks subject to County Committee approval and applicable code.
    • Holding tanks are generally prohibited except for a three-year public-sewer commitment, design flow below 150 gallons per day, necessary soil-area disturbance, or documented absence of suitable soil.

    holding-tank design wastewater flow: < 150 gallons per day (One listed exception to the general holding-tank prohibition.)

    “Holding tanks will be prohibited hereafter to serve sewage effluent disposal needs and requirements for any development except that a permit may be granted under the following circumstances:”
  • Subdividing landRegulated (with conditions)

    Subdivision plats and land divisions within Washington County townships and qualifying shoreland areas.

    • County approval applies to five or more parcels of 1.5 acres or less within five years, or three or more parcels of five acres or less in the County Shoreland Area within five years.
    • The township and, where applicable, a city or village with extraterritorial platting authority must also approve.
    • Since 2023 the County no longer reviews plats in villages and cities, subject to specified Richfield and Germantown POWTS soil-test review.

    parcel threshold: >= 5 parcels (Each parcel is 1.5 acres or less within a five-year period.) · shoreland parcel threshold: >= 3 parcels (Each parcel is 5 acres or less within a five-year period.)

    “County approval is required for all subdivision plats”
  • Driveway accessRequired

    Driveways, culverts, and roads affecting a Washington County Trunk Highway right-of-way.

    • Applicants must first review the County Access Control Policy.
    • A County Access Permit Application Form must then be submitted.
    • The page applies to activities or improvements within County Trunk Highway right-of-way.
    “Before replacing a culvert, paving or widening an existing driveway, installing a new driveway, or constructing a new road, applicants shall first review the County Access Control Policy then submit a County Access Permit Application Form.”
  • Building in a floodplainRequired

    Development or construction in county-regulated floodplain areas in unincorporated Washington County.

    • County floodplain zoning applies to unincorporated county lands defined in § 275-2 and shown on the FIRM or other Department-approved maps.
    • Applicants should contact the county before work to determine feasibility and the permitting process.
    • Some permits may require approval by the Land Use and Planning Committee and possibly the County Board.
    • The county shoreland/wetland/floodplain ordinance also covers properties within 300 feet of a river or navigable stream and within 1,000 feet of a lake or pond, as well as floodplain and wetland areas.

    river or navigable stream buffer: <= 300 feet · lake or pond buffer: <= 1000 feet

    “General provisions of Floodplain Zoning regulated by the County include lands in the unincorporated limits of Washington County, Wisconsin, as defined in § 275-2, and shown on the Flood Insurance Rate Map (FIRM) or other maps approved by the Department. If you are planning to do any work in the floodplain, please contact our office to determine the feasibility of your project and the process to be properly permitted.”
  • Permit feesPublished (with conditions)

    County permit fees, especially sanitary permits and related county applications.

    • Fees vary by permit type.
    • The county septic page links a 2026-2027 Sanitary Fee document and other permit applications.
    • No numeric fee amount was established from the opened page.
    “Permit Application & Fees: Sanitary Permit Application (pdf) State Sanitary Permit Application Fillable Form (pdf) County Plan Review Application (pdf) Used Only for County Review - Applies for Mounds, At Grade and In-Ground Pressure Systems”
  • Permit processPublished (with conditions)

    County permits and approvals for construction, sanitary systems, erosion control, stormwater, and floodplain work.

    • Applicants should plan several weeks before project start.
    • The County directs applicants to self-certification, online applications, forms, and County staff review.
    • Not all applications are available online.
    • The property owner may remain responsible for unpermitted work even when a contractor performed it.
    “not all permit applications are available online”

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 UDC one- and two-family dwelling construction.
      “Begin construction after plans are approved and building permit is issued and posted.”
    • Required — New one- and two-family dwellings, including manufactured home installations, in Washington County.
      “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.”
    One more reviewed finding on this topic
    • Available (with conditions) — An owner-occupant applying for a UDC construction or erosion-control permit.
      “applying for an erosion control or construction permit without a Dwelling Contractor Certification”
  • 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”
    5 more reviewed findings on this topic
    • Adopted (with conditions) — New one- and two-family dwellings in Washington County and Wisconsin.
      “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 dwelling construction in Washington County under Wisconsin's Uniform Dwelling Code.
      “The program governing one- and two-family dwelling units (including manufactured homes) is also called the UDC program, referring to the Uniform Dwelling Code.”
    • 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 construction phases for new one- and two-family dwellings.
      “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.”
    • Required — New one- and two-family dwellings under the UDC.
      “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.”
    One more reviewed finding on this topic
    • Limited — Occupancy of a newly constructed UDC dwelling.
      “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.”
  • 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.”
  • 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.”
  • 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.”

Inside cities and towns in Washington County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

  • Zoning districtsPublished (with conditions)

    General zoning districts and mapped zoning polygons in the Village of Germantown.

    • The county maintains the map through an intergovernmental agreement, but the Village of Germantown is the local zoning authority.
    • The county plan states the maintained data is complete for this area.
    “Name: Germantown Zoning [...] Type: Feature Layer Geometry Type: esriGeometryPolygon [...] Value: A-1 Label: A-1 Agricultural [...] Value: A-2 Label: A-2 Agricultural [...] Value: RS-1 Label: RS-1 Single-Family Residential”
    3 more reviewed findings on this topic
    • Published (with conditions) — General zoning districts and mapped zoning polygons in the Village of Kewaskum.
      “Map Name: Zoning Web (WashCo Interactive Map Service) [...] Village of Kewaskum Planned Unit Development [...] Village of Kewaskum Residential Business District [...] Village of Kewaskum Zoning”
    • Published (with conditions) — General zoning districts and mapped zoning polygons in the Village of Richfield.
      “Value: RS-1 Label: RS-1 Country Estate [...] Value: RS-1A Label: RS-1A Single-Family Residential and Rural Preservtion [...] Value: RS-1B Label: RS-1B Single-Family Cluster/Open Space Residential”
    • Published (with conditions) — General zoning districts and mapped zoning polygons in the Town of West Bend.
      “Name: T WestBend Zoning [...] Type: Feature Layer Geometry Type: esriGeometryPolygon [...] Value: B-1 Label: Commercial/Mixed Use District [...] Value: C-1 Label: Conservancy District”

Set by your township or city, not the county

In Wisconsin, zoning is adopted by each township or city, so Washington 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.

  • Camping on your land
  • Accessory dwellings

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Local zoning — General zoning administered by towns, cities, and villages within Washington County.

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 Washington County, Wisconsin

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

Washington County scores 47/100 on the Bolthole Index, a solid county profile. Its strengths: mixed durability signals and a stronger property-autonomy legal backdrop. Watch-outs: about 226,137 people within a 30-minute drive.

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

Washington County generally requires a residential building permit, and it has no county-wide zoning. Onsite septic is permitted by Washington County Land Resources Division (Sanitary Permit / POWTS). 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.

How much does land cost in Washington County, Wisconsin?

Land in Washington County runs about $9,471 per acre, based on the latest county data.

What is the water situation in Washington County?

Washington County gets about 34" of rain a year, with severe drought in roughly 1.6% of years.

How remote is Washington County?

A representative private-land location has about 226,137 people within a 30-minute drive and 6,132,100 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 Washington compares in Wisconsin

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