Zoning, building permits and septic rules in O'Fallon Township, Illinois

Rules another office applies inside O'Fallon Township

O'Fallon Township 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

  Residential dwellings in the county agricultural ('a') district on unincorporated land inside O'Fallon township

  • Stated for the agricultural district only; other county districts are not covered by this quote.
  • Applies only to unincorporated land; incorporated cities apply their own permit rules.

  “in the agricultural district, a building permit shall be required for all residential dwellings and for all other buildings or structures not used or intended for exclusive use for agricultural activities.”

• Local zoningVaries (with conditions)

  Unincorporated land inside O'Fallon township, St. Clair County, Illinois: the county zoning code applies there because the township has not been shown to adopt its own zoning. Land inside incorporated cities with their own zoning is governed by that city instead.

  • The county code applies to all properties in the unincorporated part of the county, except those occupied by Scott Air Force Base.
  • The county code does not apply to the entire county outside the limits of cities, villages and incorporated towns that have in effect municipal zoning codes.

  “it is hereby declared that the provisions of this code shall apply to all unzone municipalities and to all properties in the unincorporated part of st. clair county as provided herein, except those properties occupied by scott air force base.”

• Zoning districtsPublished (with conditions)

  Zoning districts for unincorporated land inside O'Fallon township

  • Districts apply only outside cities, villages and incorporated towns with municipal zoning codes, and outside Scott Air Force Base.
  • Full district schedule and dimensional tables were not extracted.

  “for the purpose of this zoning code, the entire county of st. clair outside the limits of cities, villages and incorporated towns which have in effect municipal zoning codes and outside the boundaries of scott air force base, is hereby divided into the following zoning districts”

• Permit processPartial

  Building and occupancy permit services for unincorporated land inside O'Fallon township, through the St. Clair County Building & Zoning Department

  • The services page lists the services but does not give the permit steps, fees or required documents.
  • The page links a Building Permit Application, a Building Permit Information Sheet and an occupancy permit application; those were not opened.

  “services provided by the zoning department include: building permits electrical permits occupancy permits zoning flood zone determination occupancy inspections building inspections”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask O'Fallon Township or St. Clair County directly.

• Owner-builder exemption — Whether an owner may build a home without a licensed contractor inside O'Fallon township
• Building code adopted — Which building code, if any, applies to new construction inside O'Fallon township
• Inspections — Whether building inspections are required for work inside O'Fallon township
• Certificate of occupancy — Whether a certificate or permit of occupancy is required before occupying a new home inside O'Fallon township
• Minimum dwelling size — Minimum dwelling size for a new home on unincorporated land inside O'Fallon township

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.