Bolthole Index

Rock County, Wisconsin

Building permits, zoning and septic rules in Edgerton, Wisconsin

Edgerton, Wisconsin requires a permit from the City Building Inspector before construction starts on any building inside city limits1. The city adopts and enforces the state Uniform Dwelling Code itself2. Where public sewer is unavailable, septic permits also come from the City Building Inspector3. Land outside the city falls under Rock County and town rules4.

At a glance

Building permit
Required from the City Building Inspector before construction1
Building code
State Uniform Dwelling Code, enforced by the city2
Septic permit
Written permit from the City Building Inspector where public sewer is unavailable3
Private wells
Must be filled where city water is available, unless the City Utility Director grants a permit5
R-1 minimum dwelling
Core dimensions of 24 feet by 40 feet6
Plans
Two sets of plans with the application for new construction7

Who to call

Building permits

City of Edgerton (City Hall)

Main city contact; the city's website lists a Building Permits page and a Forms and Permits page, and City Hall can direct you to the Building Inspector

608-884-3341

edgertongovernment@edgerton.wi.gov

12 Albion Street, Edgerton, WI 53534

Septic permits

Rock County Public Health

County septic (POWTS) plan review, permits and installation inspections; the city's own septic permit comes from its Building Inspector

608-757-5440

3328 N US Hwy 51, Janesville, WI 53545

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 Edgerton means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Edgerton, Wisconsin?

Yes. Inside Edgerton city limits, no owner or contractor may start construction of a building or mechanical system before getting a permit from the City Building Inspector1. Permits also cover non-minor additions, alterations and repairs, changes of use, new accessory buildings, and heating, electrical or plumbing work1.

The city's exception is narrow: improvements of $2,000 or less that do not affect structural use or encroach on a yard or open space, plus minor repairs1. A new house is never in that category.

The permit rests on the Uniform Dwelling Code, which Wisconsin applies statewide to one- and two-family homes8. Edgerton's own code adopts that code along with the commercial building, plumbing and electrical chapters, and the City Building Inspector enforces them2.

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

The City of Edgerton issues them, through its Building Inspector, not Rock County2. Applications go to the Building Inspector on city forms or the Wisconsin Uniform Dwelling permit form7. The city provides plan review and on-site inspections through state-certified inspectors for one- and two-family dwellings and commercial buildings9.

The application needs two sets of plans, a dimensioned property map and the proposed use7. Fees are set by the municipality's own ordinance10.

City Hall is the main contact11. We could not confirm a direct line or counter hours for the Building Inspector, so ask City Hall to connect you. The inspector may enter premises at reasonable hours to inspect9.

Does Edgerton have zoning, and what does it mean for lot size and setbacks?

Edgerton's zoning code sets rules by district. In the R-1 Residential District, the minimum dwelling core dimensions are 24 feet by 40 feet6. That is a district rule, so a lot in another district can have a different standard.

We could not confirm the city's setbacks, minimum lot sizes or accessory-dwelling rules, so check your parcel's district with City Hall before you buy11.

Rock County does not zone ordinary land inside the city. Its own zoning is limited to overlay districts for floodplain, shoreland and airport areas, and ordinary zoning is handled by towns, cities and villages12.

How do septic permits work inside Edgerton?

Most Edgerton lots connect to public sewer, and private systems are the exception. A private wastewater system is allowed only where public sanitary sewer is unavailable and the approving authority agrees13.

Where it is allowed, the owner must first get a written permit from the City Building Inspector, and the system must meet state Department of Safety and Professional Services requirements plus any extra Health Officer requirements3. The city's sewer ordinance also incorporates Rock County and Dane County private-sewage rules14.

If public sewer later reaches the property, the building sewer must connect within one year, and the old private system must be cleaned out and filled15.

Rock County Public Health also appears to review plans and permit septic systems countywide, so ask it how its review fits with the city's permit1617.

Can you live in an RV or tiny home in Edgerton?

We could not confirm it. Edgerton's code defines recreational vehicles and lists temporary-use provisions, but we did not retrieve the rules on long-term RV living, temporary camping or tiny-home occupancy. Ask City Hall before you park an RV on a lot or plan a tiny home11.

A tiny home built as a permanent dwelling would still go through the permit process: the city requires a building permit for new construction1. The state's Uniform Dwelling Code also covers manufactured homes installed as new dwellings18.

Building a home in Edgerton: the steps, in order

  1. Confirm the lot's zoning district and whether public sewer and city water reach it, by calling City Hall11.
  2. If there is no public sewer, get a written septic permit from the City Building Inspector first; Wisconsin does not issue a building permit for a new dwelling on a private system until the sanitary permit is issued319.
  3. Prepare two sets of plans and a dimensioned property map, then apply to the Building Inspector7.
  4. Begin construction only after plans are approved and the permit is issued and posted19.
  5. Call for an inspection of each phase before covering it up; the inspector has two business days to respond20.
  6. Take occupancy only after a final inspection finds no major health or safety violations21.

What stays with Rock County, and what should you check before you buy in Edgerton?

Inside Edgerton, the city issues building permits and its Building Inspector handles private septic permits; Rock County's overlay zoning for floodplain and shoreland areas still applies where those districts are mapped312. For land outside city limits, use the Rock County page, because town and county rules differ from the city's.

If you want a private well, the city requires wells on premises that city water can serve to be filled unless the City Utility Director grants a well operation permit5.

Countywide numbers: Rock County's effective property tax rate is 1.7%22, and only about 10.6% of its soils rate "not limited" for a conventional septic drain field, so lots without sewer often need a site evaluation or an engineered system23.

Watch-outs

  • We could not confirm Edgerton's rules on certificates of occupancy, owner-builders inside city limits, accessory dwellings, short-term rentals or agricultural buildings, so ask City Hall before you rely on them11.
  • Rock County's rule that a building site needs either a county sanitary permit or an approved connection to public sewer applies to county building-site permits for unincorporated land, not to city lots24.
  • A driveway onto a state highway needs a WisDOT connection permit, separate from the city's building permit25.

Sources

  1. Chapter 192 Building Construction (Edgerton), quoted and re-checked
  2. Chapter 192 Building Construction (Edgerton), quoted and re-checked
  3. Article I: Sewer Utility (Edgerton), quoted and re-checked
  4. Rock County Code of Ordinances, quoted and re-checked
  5. Chapter 384 Wells (Edgerton), quoted and re-checked
  6. Residential District One (R-1) dimensional standards (Edgerton), quoted and re-checked
  7. Chapter 192 Building Construction (Edgerton), quoted and re-checked
  8. One- & Two-Family (Uniform Dwelling Code) (Wisconsin statewide rule), quoted and re-checked
  9. Chapter 192 Building Construction (Edgerton), quoted and re-checked
  10. Wisconsin Administrative Code SPS 302.34 (Wisconsin statewide rule), quoted and re-checked
  11. City of Edgerton (City Hall) (cityofedgerton.com)
  12. Rock County Code of Ordinances, quoted and re-checked
  13. Article I: Sewer Utility (Edgerton), quoted and re-checked
  14. Article I: Sewer Utility (Edgerton), quoted and re-checked
  15. Article I: Sewer Utility (Edgerton), quoted and re-checked
  16. Rock County Public Health - Septic Systems (2026 county census)
  17. Rock County Public Health (co.rock.wi.us)
  18. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  19. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  20. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  21. Wisconsin’s Uniform Dwelling Code (Wisconsin statewide rule), quoted and re-checked
  22. Effective property tax rate: Bolthole Index county data
  23. 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
  24. co.rock.wi.us, quoted and re-checked
  25. State highway connection permits (driveways & more) (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.

Answers from the rulebook for Edgerton

Edgerton’s own rules

  • Building permitRequired

    Construction of buildings or mechanical systems inside Edgerton city limits.

    • No owner or contractor may commence construction before obtaining a valid Building Inspector permit.
    • Permits are also required for non-minor additions, alterations, repairs, changes of use, increased floor area, new accessory buildings, and heating, electrical, or plumbing system work.
    • A permit exception exists for improvements or alterations of $2,000 or less that do not affect structural use or encroach on a yard or open space, and for minor repairs.
    “Building permits required. No owner or contractor may commence construction of any building or mechanical system prior to obtaining a valid permit from the Building Inspector.”
  • Building code adoptedAdopted

    Building construction inside Edgerton city limits.

    • The City adopts and enforces listed Wisconsin Administrative Code chapters, including the Uniform Dwelling Code, Commercial Building Code, Uniform Plumbing Code, Electrical Code, and Campgrounds chapter.
    “The following chapters of the Wisconsin Administrative Code shall be adopted and enforced by the City's Building Inspector:”
  • InspectionsRequired

    One- and two-family dwellings and commercial buildings inside Edgerton city limits.

    • The City provides plan review and on-site inspections through certified inspectors.
    • The Building Inspector may enter public or private premises at reasonable hours for inspection purposes.
    “Provide plan review and on-site inspections of one- and two-family dwellings and commercial buildings by inspectors certified by the Department of Safety and Professional Services;”
  • Who permits septicMixed (with conditions)

    Private wastewater systems inside Edgerton city limits.

    • The City's sewer ordinance incorporates applicable Rock and Dane County private-sewage rules and Wisconsin requirements.
    • The City Building Inspector issues the written permit for private wastewater disposal construction.
    • Additional requirements may be imposed by the Health Officer.
    “Before commencement of the construction of a private wastewater disposal system or additions to an existing private wastewater disposal system, the owner shall fist obtain a written permit from the office of the City Building Inspector.”
  • Septic permitRequired

    Construction or additions to private wastewater disposal systems where public sanitary sewer is unavailable inside Edgerton city limits.

    • Written permit from the City Building Inspector must be obtained before construction begins.
    • The system must comply with Wisconsin Department of Safety and Professional Services requirements and any additional Health Officer requirements.
    “Before commencement of the construction of a private wastewater disposal system or additions to an existing private wastewater disposal system, the owner shall fist obtain a written permit from the office of the City Building Inspector.”
  • Off-grid sanitationLimited

    Private wastewater disposal systems inside Edgerton city limits.

    • Allowed only where public sanitary sewer is unavailable and with approving-authority approval.
    • Written City Building Inspector permit is required before construction.
    • Additional Health Officer requirements may apply.
    “Rules. Where a public sanitary sewer is not available under the provision of § 366-7A and with the approval of the approving authority, any building sewer shall be connected to a private wastewater disposal system complying with the provisions of this section.”
  • Well permitLimited

    Private well operation inside Edgerton city limits on premises that can be serviced by the public water system.

    • Private wells on serviceable premises must be filled unless a City Utility Director well operation permit is granted.
    • Permit criteria include NR 812 compliance, safe-water history and three bacteriological samples two weeks apart, justified necessity, and no physical connection between public and private piping.

    bacteriological samples: 3 samples (two weeks apart)

    “All private wells within the City limits located on any premises which can be serviced by the public water system of the City of Edgerton shall be properly filled. Only those wells for which a well operation permit has been granted by the City Utility Director may be exempted from this requirement, subject to conditions of maintenance, operation and content of water.”
  • Mandatory utility hookupSewer (with conditions)

    Properties inside Edgerton city limits served by a private wastewater disposal system when public sewer later becomes available.

    • The building sewer must connect to the public sewer within one year after public sewer becomes available.
    • The private system must be cleaned of sludge and filled with sand, gravel, or similar material.
    • Where public sewer is unavailable, private wastewater disposal may be used with approval and a written permit.

    connection deadline after public sewer availability: 1 year

    “At such time as a public sewer becomes available to a property served by a private wastewater disposal system, as provided in § 366-7A, the building sewer shall be connected to said sewer within one year, and the private wastewater disposal system shall be cleaned of sludge and filled with sand, gravel or similar material.”
  • Permit processPublished (with conditions)

    Building permit applications inside Edgerton city limits.

    • Applications are made to the Building Inspector on City or Wisconsin Uniform Dwelling Permit forms.
    • Two sets of plans are required for new construction, repairs, or additions involving one- and two-family dwellings, commercial, detached, or accessory buildings.
    • The application must include a dimensioned property map, proposed use, and other information required for enforcement.
    “Application for building permit. An application for building permit shall be made to the Building Inspector upon forms furnished. The applicant shall submit two sets of plans for all new construction, repairs or additions to existing one- or two-family dwellings, commercial, detached structures and accessory buildings at the time that the building permit application is filed.”

Rules another office applies inside Edgerton

Edgerton does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Minimum dwelling sizeSpecified

    R-1 Residential District inside Edgerton city limits.

    • The minimum dwelling core dimensions are stated as 24 feet by 40 feet.

    minimum dwelling core dimensions: 24 feet by 40 feet

    “Minimum dwelling core dimensions: 24 feet by 40 feet.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Edgerton or Rock County directly.

  • Owner-builder exemption — Owner-builders performing construction inside Edgerton city limits.
  • Certificate of occupancy — Certificates of occupancy for land and buildings inside Edgerton city limits.
  • Living in an RV — Long-term or primary RV occupancy on private land inside Edgerton city limits.
  • Camping on your land — Temporary camping on private land inside Edgerton city limits.
  • Tiny homes — Tiny-home occupancy inside Edgerton city limits.
5 more unanswered
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Agricultural exemption
  • 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 Edgerton publishes no rule on the point, not that none exists. Rock County’s page lists the county offices to call.

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