Zoning, building permits and septic rules in Town of Sun Prairie, Wisconsin

Town of Sun Prairie’s own rules

• Building permitLimited

  Replacement of water heaters, water softeners and furnaces/air conditioners inside the Town of Sun Prairie (no building permit needed for these replacements).

  • Exemption covers replacement only; new installations and other work still follow the building permit requirement.

  “effective july 1, 2024, building permits are no longer required for replacing water heaters, water softeners and furnaces/air conditioners.”

• Building code adoptedAdopted

  Construction inside the Town of Sun Prairie, under the town's building code ordinance 93-1.

  • Based on the town's ordinance list only; the text of ordinance 93-1 was not opened, so the codes it adopts (and any state Uniform Dwelling Code reference) are not confirmed.
  • Repealed or amended status of ordinance 93-1 is not confirmed from the list.

  “ordinance 93-1 building code ordinance 2004-3 ordinance to establish a conservation easement program”

• InspectionsRequired

  Permitted construction inside the Town of Sun Prairie.

  • Inspections are performed by General Engineering Company (town building inspector), scheduled by email with permit number, address, contractor and inspection type.
  • Required inspections listed by the town include footings, foundation, rough plumbing, rough frame, electrical, heating/air, ductwork, and final inspection; furnace and water must be functioning at final.

  “All inspections are handled through General Engineering Company.”

• Local zoningPresent

  All land inside the Town of Sun Prairie limits (Marshall, WI mailing address), administered by the town zoning administrator.

  • Source is the town's zoning ordinance dated May 21, 2018 (the version posted by the town). The town's minutes show later amendments (for example a 2020 change to the kennel standard in sec. 1.0622), so the current consolidated text should be confirmed.
  • Parcels inside the City of Sun Prairie or other incorporated limits are not covered by this ordinance.

  “This ordinance applies to all land located within the Town.”

• Zoning districtsPublished

  Zoning districts of the Town of Sun Prairie, including the single family residential (SFR) district and the agricultural districts.

  • Districts listed in the 2018 ordinance include SFR (1.0324), multiple family residential (MFR, 1.0325), planned unit development, rural community, rural-based business, recreation commercial, and the agricultural districts.
  • The zoning map on the zoning page is an older (2011-based) map; the district map was not opened.

  “1.0324 single family residential zoning district (sfr) 1.0325 multiple family residential zoning district (mfr)”

• Minimum dwelling sizeSpecified

  Residential dwellings in all zoning districts inside the Town of Sun Prairie (general rule; not district-specific).

  • Applies unless otherwise specified by the zoning chapter.
  • Mobile or manufactured homes in a mobile home park are exempt.

  minimum floor area per dwelling: >= 500 square feet (mobile or manufactured homes in a mobile home park are exempt; unless otherwise specified by the chapter)

  “buildings used in whole, or in part, for residential purposes shall have a floor area of not less than 500 square feet per dwelling”

• SetbacksSpecified

  Structures near county roads inside the Town of Sun Prairie (road setback line).

  • Setback is measured from whichever is greater: 75 feet from the centerline or 42 feet from the right-of-way line.
  • A specific road with a greater setback requirement controls.
  • Town-road setbacks are set out in the same section and were not extracted.

  county road setback from centerline: >= 75 feet (or 42 feet from the right-of-way line, whichever is greater)

  “the setback line for county roads shall be 75 feet from the centerline or 42 feet from the right-of-way line, whichever is greater.”

• Camping on your landLimited

  Campgrounds and camping units inside the Town of Sun Prairie

  • Campground is listed as a use in the land use table (sec. 1.0612), so the district where it is allowed was not confirmed.
  • Campgrounds must obtain all federal, state and local permits and comply with DHS 178 setbacks and siting rules.
  • A land use permit is filed with the zoning administrator.

  maximum occupancy per calendar year: <= 240 days (stays are combined in determining the period; no continuity required)

  “a camping unit may not be occupied for more than 240 days in a calendar year.”

• Septic permitRequired

  New residential construction inside the Town of Sun Prairie: a copy of a sanitary permit must accompany the town building permit application. The rule-maker that issues the sanitary permit is not named on the page opened.

  • Sanitary permit must be attached to the building permit application (not stated as a separate town permit).
  • Plot plan must show septic and well locations.

  “building permit application, including plumbing, electrical, and hvac permits copy of sanitary permit copy of erosion control plan heat loss worksheet”

• Agricultural exemptionConditional

  General agricultural use (crop, livestock, grazing, forest management) inside the Town of Sun Prairie.

  • Permanent structures still require a land use permit.
  • Farm defined as 35 acres or more for new agricultural structures needing building, electrical, heating and plumbing permits (town building permit page).

  “establishment or changes of land uses associated with general agricultural use including crop or livestock production, grazing, and forest management shall not require the issuance of a land use permit by the town zoning administrator.”

• Subdividing landRegulated (with conditions)

  Land divisions and new lots created inside the Town of Sun Prairie.

  • All lots created must meet minimum lot area requirements.
  • Town preliminary plan application and a $2,000 fee per new lot apply (see permit_fees claim); the subdivision ordinance itself was not opened.

  “all lots created shall meet minimum lot area requirements.”

• Driveway accessRequired

  New driveways, field road accesses and parcel accesses inside the Town of Sun Prairie.

  • Driveway access requires town approval (zoning ordinance); a copy of the approved driveway access permit is needed for a new residence.
  • Driveway ordinance 2000-3 is listed on the town ordinances page; its text was not opened.

  “no person may establish a driveway, field road access or parcel access location without approval of the town.”

• Permit feesPublished

  New residential construction and new lot creation inside the Town of Sun Prairie.

  • Only the new-lot fee is stated on the page opened; the GEC zoning administration fee schedule and building inspection fee schedule are linked but were not opened.

  fee per new lot created: 2000 USD (payable to the Town of Sun Prairie)

  “$2,000.00 fee for every new lot created, payable to the town of sun prairie”

• Permit processPublished

  Building permit process for new construction and additions inside the Town of Sun Prairie.

  • Zoning/land use permit first, then building permit application with plans, plot plan, sanitary permit and driveway access permit.
  • Inspections are scheduled through General Engineering Company by email.

  “prior to applying for a building permit in the town of sun prairie you will need to obtain a zoning/land use permit issued by general engineering company.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Sun Prairie or Dane County directly.

• Owner-builder exemption — Owner-builder exemption for building permits inside the Town of Sun Prairie
• Certificate of occupancy — Certificate of occupancy for a new home inside the Town of Sun Prairie
• Tiny homes — Tiny homes used as a dwelling inside the Town of Sun Prairie
• Accessory dwellings — Accessory dwelling (second dwelling on the same lot) inside the Town of Sun Prairie
• Who permits septic — Sanitary (on-site wastewater) system authority inside the Town of Sun Prairie

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.