Bolthole Index

Sangamon County, Illinois

Zoning, building permits and septic rules in Williamsville, Illinois

The Village of Williamsville, Illinois adopts and enforces its own zoning ordinance, Chapter 320 of the village code1. Building permits start at village hall with a $50 project review fee, and the village sends most projects on to Sangamon County for the county permit2. Septic and well permits come from the Sangamon County Department of Public Health3.

At a glance

Zoning
Village zoning ordinance, Chapter 3201
Building permit
Start at village hall, then a Sangamon County permit for most projects2
Village review fee
$50 project review fee4
Sheds, fences, driveways
Permitted by the village itself5
Septic
Sangamon County Department of Public Health; connect to public sewer where it is within 100 feet36
Wells
County health department permit7

Who to call

Building permits

Village of Williamsville, Building & Zoning (Village Hall)

Village zoning, the first step of every building permit application, and village-issued permits for sheds, fences, driveways, signs and small pools

(217) 566-3806

141 West Main, Williamsville, Illinois 62693

Building permits

Sangamon County Department of Building and Zoning

The county building permit that follows the village's review for most projects inside Williamsville

(217) 753-6760

zoning@sangamonil.gov

200 S. Ninth St., Room 234 Springfield, IL 62701

Septic permits

Sangamon County Department of Public Health, Environmental Health

Septic system permits and private well permits

217-535-3145

2833 South Grand Avenue East Springfield, IL 62703-2175

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

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

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Does Williamsville, Illinois have zoning?

Yes. The Village of Williamsville adopts and administers its own zoning ordinance, Chapter 320 of the village code, and its director of building and zoning enforces it1. Chapter 320 sets zoning districts for land inside village limits8, and division of land is regulated separately under Chapter 263, Subdivision of Land9.

We could not confirm the district-by-district rules that most buyers ask about: minimum lot size, setbacks, minimum home size, and whether an RV, tiny home or manufactured home can be lived in on a lot. Ask the Village of Williamsville at village hall, (217) 566-3806, which district a parcel is in and what that district allows before you make an offer5. The village's zoning map and ordinance are posted on its building and zoning page.

Do you need a building permit in Williamsville, and who issues it?

Yes, for most projects. Since January 2025 the Village of Williamsville and Sangamon County share the building permit process under an intergovernmental agreement, and the village issues its own permits only for sheds of 900 square feet or less, fences, driveways and sidewalks, signs and towers, and above-ground pools of 24 inches or less5.

For any other project, including a house, the process still starts at the village with a $50 project review fee4. Once the fee is paid, the village submits its approval or denial to Sangamon County, and the applicant completes a county building permit and pays any county fees10. Application forms for both are on the village's building and zoning page. We could not confirm who performs building inspections inside the village or whether an owner-builder exemption applies; ask village hall.

How do septic permits work inside Williamsville?

Septic permits for a Williamsville address come from the Sangamon County Department of Public Health, not from the village3. The owner hires a licensed septic contractor and a licensed soil scientist, and the contractor usually submits the permit application11. Call Environmental Health at 217-535-314512.

Village code adds two limits. Where a public sanitary sewer is within 100 feet of a property used for human occupancy, the owner must connect within 90 days of official notice, and an existing septic system on a property that gains sewer access must be connected to the sewer and abandoned6. Septic tanks and cesspools may not discharge to a natural outlet13. In practice, a lot on a village sewer line will not get a septic system, so confirm sewer availability with village hall first. Private well permits are also a county health department matter7.

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

We could not confirm. The village's zoning ordinance would answer it, but we did not find a verified rule on RV occupancy, tiny homes, temporary camping or manufactured homes inside Williamsville. Do not assume a lot allows any of them.

The zoning district decides the answer, so ask the Village of Williamsville building and zoning office at (217) 566-3806 for the district and its permitted uses before you plan to live in anything other than a site-built house5.

Building a home in Williamsville: the steps, in order

  1. Call village hall at (217) 566-3806 and ask which zoning district the parcel is in and whether the use you want is allowed5.
  2. Ask whether a public sewer is within 100 feet; if it is, plan to connect to it rather than install a septic system6.
  3. If no sewer is available, call Sangamon County Environmental Health at 217-535-3145 about septic and well permits12.
  4. File the village building permit form with the $50 project review fee4.
  5. After the village submits its approval, complete the Sangamon County building permit and pay county fees10.
  6. For a driveway inside the village, apply to the village; a driveway onto a county highway needs the Sangamon County Highway Department14.

What stays with Sangamon County, and what to check before you buy

Inside Williamsville the village handles zoning and starts every building permit application, but septic and well permits stay with the Sangamon County Department of Public Health3. Land outside village limits follows county rules instead; see the Sangamon County page for unincorporated land.

Before you buy, confirm the zoning district, sewer availability and any floodplain status with village hall. Sangamon County requires a floodplain development permit for development in a 100-year floodplain in unincorporated areas, so ask the village how floodplain rules apply to a parcel inside it15. Sangamon County's effective property tax rate is 2% and its median property tax bill is $3,369 a year1617.

Watch-outs

  • The village's own permit list is short, so a house, addition or other larger project needs a Sangamon County permit as well as the village's review2.
  • We could not confirm Williamsville's minimum lot size, setbacks, RV, tiny-home or accessory-dwelling rules; ask the village building and zoning office before you buy5.
  • A parcel on a village sewer line may be required to connect, even if a septic system already exists6.

Sources

  1. Village of Williamsville, Building & Zoning page (Village of Williamsville), quoted and re-checked
  2. Village of Williamsville, Building & Zoning page (Village of Williamsville), quoted and re-checked
  3. Environmental Health, quoted and re-checked
  4. Village of Williamsville, Building & Zoning page (Village of Williamsville), quoted and re-checked
  5. Village of Williamsville, Building & Zoning (Village Hall) (williamsville.illinois.gov)
  6. Village of Williamsville, IL sewers chapter, private sewage disposal and public sewer connection (eCode360) (Village of Williamsville), quoted and re-checked
  7. sangamonil.gov, quoted and re-checked
  8. Chapter 320 Zoning, Village of Williamsville, IL (eCode360) (Village of Williamsville), quoted and re-checked
  9. Village of Williamsville, IL code of ordinances table of contents (eCode360) (Village of Williamsville), quoted and re-checked
  10. Village of Williamsville, Building & Zoning page (Village of Williamsville), quoted and re-checked
  11. Environmental Health, quoted and re-checked
  12. Sangamon County Department of Public Health, Environmental Health (sangamonil.gov)
  13. Village of Williamsville, IL sewers chapter, private sewage disposal and public sewer connection (eCode360) (Village of Williamsville), quoted and re-checked
  14. Village of Williamsville, Building & Zoning page (Village of Williamsville), quoted and re-checked
  15. Owning and Using Property in a Floodplain, quoted and re-checked
  16. Effective property tax rate: Bolthole Index county data
  17. Median property tax bill: Bolthole Index county data

Written October 24, 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 Village of Williamsville

Village of Williamsville’s own rules

  • Local zoningPresent (with conditions)

    Land inside Williamsville village limits. The village adopts and administers its own zoning ordinance, Chapter 320 Zoning of the village code.

    • Land use inside the village is governed by Chapter 320 Zoning; the village building and zoning director enforces the Williamsville zoning ordinance.
    • Chapter 320 history records adoption in 1964 with last amendment 7-13-2009 by Ord. No. 2009-08; the village-hosted zoning ordinance PDF returned an unsupported-format error when opened, so its text was not reviewed.
    • Use status is conditional because each use is subject to Chapter 320 district rules that were not reviewed in this research pass.
    “the director of building and zoning is appointed by the village president with duties to enforce the williamsville zoning ordinance, including:”
  • Zoning districtsPartial

    Zoning districts established by Chapter 320 Article V inside Williamsville village

    • Article V (§ 320-26 establishment of districts; § 320-27 incorporation of maps; § 320-28 boundaries of districts) is in the code; the district list and the zoning map PDF were not read.
    • The village building page links a zoning map PDF, which was not opened.
    “article v zoning districts § 320-26 establishment of districts. § 320-27 incorporation of maps. § 320-28 boundaries of districts.”
  • Off-grid sanitationLimited

    Private sanitation facilities (privies, septic tanks, cesspools) inside Williamsville village limits

    • Construction or maintenance of a privy, septic tank, or cesspool is unlawful except as the code provides elsewhere ("as hereinafter provided").
    • Septic tanks and cesspools may not discharge to a natural outlet.
    • Where a public sewer is available, private systems must be abandoned and connected.
    “no septic tank or cesspool shall be permitted to discharge to any natural outlet.”
  • Mandatory utility hookupSewer (with conditions)

    Properties inside Williamsville village used for human occupancy that abut a street, alley, or right-of-way with a public sanitary or combined sewer

    • Owners must install toilet facilities and connect them to the public sewer within 90 days after official notice, if the public sewer is within 100 feet.
    • A private septic system on a property where a public sewer becomes available must be directly connected to the public sewer and the septic tank abandoned and filled.
    • The 100-foot distance is the trigger in the captured text; the rule's full wording beyond that point was cut off in capture.

    distance to public sewer triggering connection: <= 100 feet (applies to properties abutting a street, alley, or right-of-way with a public sewer; connection within 90 days after official notice)

    “within 90 days after date of official notice to do so, provided that said public sewer is within 100 feet”
  • Subdividing landRegulated (with conditions)

    Division of land inside Williamsville village limits

    • Subdivision rules are in Chapter 263 Subdivision of Land (§ 263-1 to § 263-49); the chapter text was not opened.
    • The village building page also lists a subdivision regulations PDF, which was not opened.
    “chapter 263 subdivision of land (§ 263-1 &ndash; § 263-49)”
  • Driveway accessRequired

    Driveway construction inside Williamsville village limits, which the village issues permits for

    • Driveway permit is issued by the village under the 2025 intergovernmental agreement.
    • Access standards are in Chapter 146 Driveways (§ 146-1 to § 146-3); the text was not opened.
    “the village of williamsville will be issuing permits for the following: sheds - 900 sq. ft or less - they must be anchored to sustain 75mph winds. fences driveways/sidewalks signs/towers above ground pools 24" or less”
  • Permit feesPublished (with conditions)

    Village project review fee for permit applications inside Williamsville village

    • The $50 fee is the only village fee found on the opened page; the full fee schedule (Chapter 155 Fees) was not opened.
    • County permit fees are charged separately under the county process.

    project review fee: 50 USD (payable to the village before the village submits its approval or denial to Sangamon County)

    “the process still needs to begin at the village of williamsville and a project review fee of $50 will apply.”
  • Permit processPublished (with conditions)

    Building permit process for projects inside Williamsville village

    • Step 1: start at the village and pay the $50 project review fee.
    • Step 2: the village submits its approval or denial to Sangamon County.
    • Step 3: complete the county permit with any applicable fees. The village page links a county building permit form.
    “once the $50 fee is paid to the village of williamsville, we will submit our approval/denial to sangamon county.”

Rules another office applies inside Village of Williamsville

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

  • Building permitRequired

    Inside Williamsville village: all other building projects not listed for village permits, which the village directs to Sangamon County

    • The village is the first step: a project review fee of $50 applies and the village submits its approval or denial to the county.
    • A county permit must also be completed with Sangamon County, along with any applicable county fees.
    • The county fee schedule was not opened.
    “any other project will be directed to sangamon county.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Village of Williamsville or Sangamon County directly.

  • Owner-builder exemption — Owner-builder permit exemption inside Williamsville village
  • Building code adopted — Building construction inside Williamsville village limits
  • Inspections — Building inspections inside Williamsville village limits
  • Minimum dwelling size — Minimum dwelling size for single-family residences inside Williamsville village
  • Minimum lot size — Minimum lot size for the main single-family residential district inside Williamsville village
13 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Well permit
  • 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 Village of Williamsville publishes no rule on the point, not that none exists. Sangamon County’s page lists the county offices to call.

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