Bolthole Index

Sauk County, Wisconsin

Zoning, building permits and septic rules in the Town of Delton, Wisconsin

The Town of Delton, in Sauk County, Wisconsin, has its own zoning chapter covering all unincorporated land in the town1. Building permits are required from the town's Building Inspector before construction starts2. Septic permits fall under Sauk County's private sewage system ordinance, which applies throughout the town3. Detached accessory structures cannot be used as separate dwellings4.

At a glance

Zoning
Town of Delton zoning chapter applies to all land in the town1
Building permit
Required from the town's Building Inspector before construction2
Building code
Wisconsin Administrative Code building chapters adopted by the town5
Septic
Sauk County private sewage system ordinance applies town-wide3
Mobile homes
Allowed where single-family homes are, with conditions and a special permit outside a park6
Second dwelling
Detached accessory structures cannot be a separate dwelling4
Owner-builder
Owner-occupants may take out Uniform Dwelling Code permits7

Who to call

Zoning

Town of Delton Zoning Officer and Building Inspector

Town zoning administration and enforcement under Chapter 255

Septic permits

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

Land use and sanitary (septic) permit applications for Sauk County, filed online

(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 Town of Delton means bringing your own water and power. The kit we’d start with:

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Does the Town of Delton have zoning?

Yes. The Town of Delton's zoning chapter states that its jurisdiction includes all lands and waters within the unincorporated limits of the Town of Delton1. The town has a Zoning Officer who administers and enforces the chapter3.

Several Sauk County rules apply on top of town zoning: the land division and subdivision regulations, the shoreland protection ordinance, the private sewage system ordinance and the floodplain ordinance3. We could not confirm district-level minimum dwelling size, lot coverage or height limits; ask the Zoning Officer which district a parcel sits in before you buy.

Can you put a mobile home, tiny home or second dwelling on land in the Town of Delton?

A mobile home may be a permanent residence in the Town of Delton wherever single-family dwellings are permitted, unless deed restrictions prohibit it. The wheels must come off, the home must sit on a foundation and be skirted, and it must be secured against wind6. Outside a licensed mobile-home park, a special written permit is required, and no more than two mobile homes may be permitted on one premise6.

In the Town of Delton, a structure that is accessory to and detached from a residential use may not be used as a separate dwelling unit4. That rules out a guest cabin or converted outbuilding as a second home. We could not confirm any rule specific to tiny homes or RV living; ask the Zoning Officer.

Do you need a building permit in the Town of Delton, and who issues it?

Yes. In the Town of Delton, no owner or contractor may start construction of a building or mechanical system without a valid permit from the town's Building Inspector2. Same-for-same equipment replacement and routine repairs do not need one2. The town has adopted Wisconsin Administrative Code building chapters and enforces them through its Building Inspector5.

For a new one- or two-family home, Wisconsin's Uniform Dwelling Code also requires a permit8, and an owner who will live in the home can take out the construction and erosion-control permits7. Sauk County says each municipality contracts its own private building inspector, so call the Town of Delton clerk for the current inspector3. We could not confirm whether the town requires a certificate of occupancy or has an owner-builder exemption beyond the state rule.

How do septic permits work in the Town of Delton?

Septic permits for the Town of Delton come from Sauk County, not the town. The town's code applies the Sauk County private sewage system ordinance throughout the town3, and the county requires a permit to build, alter or change use of a structure that needs a private onsite wastewater system9.

Sauk County Land Resources and Environment takes land use and sanitary permit applications online and says review takes 7-10 days10. Soils matter: only 3.2% of Sauk County soils rate "not limited" for a conventional drain field, so expect a site evaluation and possibly an engineered system11. Wells and any public sewer connection rules inside the town are unconfirmed; ask the county and the town clerk.

What stays with Sauk County around the Town of Delton?

Sauk County handles septic permits, shoreland, floodplain and land division in the town3. A driveway onto a state highway needs a state permit12. For land outside the town, see the Sauk County page.

Sauk County's effective property tax rate is 1.5%13, and the median property tax bill is $3,646 a year14.

Watch-outs

  • Do not confuse the Town of Delton with the Village of Lake Delton; the rules above are the Town of Delton's own1.
  • Floodplain development rules apply under the Sauk County floodplain ordinance, but we could not confirm the operative permit steps for a Delton parcel; call Sauk County Land Resources and Environment at (608) 355-324510.
  • If a deed restriction prohibits mobile homes, it overrides the town's allowance6.

Sources

  1. Chapter 255 Zoning (Town of Delton), quoted and re-checked
  2. Chapter 83 Building Construction (Town of Delton), quoted and re-checked
  3. Town of Delton Zoning Officer and Building Inspector (ecode360.com)
  4. ecode360.com (Town of Delton), quoted and re-checked
  5. Chapter 83 Building Construction (Town of Delton), quoted and re-checked
  6. ecode360.com (Town of Delton), quoted and re-checked
  7. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  8. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  9. Chapter 25 Private Sewage System Ordinance, quoted and re-checked
  10. Sauk County Land Resources and Environment: Land Use/Sanitary Permits (co.sauk.wi.us)
  11. 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
  12. State highway connection permits (driveways & more) (Wisconsin statewide rule), quoted and re-checked
  13. Effective property tax rate: Bolthole Index county data
  14. Median property tax bill: Bolthole Index county data

Written October 15, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Town of Delton

Town of Delton’s own rules

  • Building permitRequired

    New buildings, additions, structural alterations, specified equipment, electrical, HVAC, plumbing, and new or rewired electrical service inside Delton town.

    • A valid permit from the municipal Building Inspector must be obtained before construction.
    • Same-for-same equipment replacement and routine repairs and maintenance do not require a permit.
    • The listed categories are illustrative rather than exhaustive.
    “No owner or contractor may commence construction of any building or mechanical system prior to obtaining a valid permit”
  • Building code adoptedAdopted

    Building construction inside Delton town.

    • The Town adopted specified Wisconsin Administrative Code chapters and subsequent revisions.
    • The Town has adopted certified municipality status and enforces the adopted codes through its Building Inspector.
    “The following chapters of the Wisconsin Administrative Code, as well as all subsequent revisions, are adopted by the Town”
  • Local zoningPresent

    Land within the unincorporated limits of the Town of Delton.

    • The zoning chapter states that its jurisdiction includes all lands and waters within the unincorporated limits of the Town of Delton.
    “The jurisdiction of this chapter shall include all lands and waters within the unincorporated limits of the Town of Delton.”
  • Manufactured homesLimited

    Manufactured/mobile-home occupancy inside Delton town.

    • A mobile home may be a permanent residence wherever single-family dwellings are permitted unless deed restrictions prohibit it.
    • Wheels must be removed; the home must be placed on a foundation and skirted; it must be secured against wind damage and other hazards; and the surrounding area must be landscaped.
    • Proper licensing is required.
    • Outside a licensed mobile-home park, a special written permit is required, except one unoccupied mobile home stored in a private garage or rear yard without living quarters or business use.
    • No more than two mobile homes may be permitted on one premise outside a mobile-home park.
    • Town, county, and state sanitation requirements must be satisfied.

    maximum mobile homes outside a mobile-home park: <= 2 homes per premise (Special written permits and owner consent required.)

    “No person shall park or occupy any mobile home on any premises situated outside a licensed mobile home park except under special permit”
  • Accessory dwellingsProhibited

    A detached accessory structure used as a separate dwelling unit inside Delton town.

    • The prohibition applies to structures accessory to and detached from a residential use.
    • The same section also prohibits placement in required rear, side, highway, or water setbacks.
    “Structures accessory to and detached from a residential use shall not be used as a separate dwelling unit.”

Still unanswered

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

  • Owner-builder exemption — Owner-builders constructing or altering buildings inside Delton town.
  • Certificate of occupancy — Certificates of occupancy for buildings inside Delton town.
  • Minimum dwelling size — Minimum dwelling size inside Delton town.
  • Lot coverage — Lot coverage inside Delton town.
  • Building height — Building height inside Delton town.
9 more unanswered
  • Tiny homes
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Building in a floodplain
  • Short-term rentals

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.

Unanswered questions are usually a sign that Town of Delton publishes no rule on the point, not that none exists. Sauk County’s page lists the county offices to call.

← All of Sauk County: county rules, score and offices