Zoning, building permits and septic rules in Avon Township, Illinois

Rules another office applies inside Avon Township

Avon 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 code adoptedAdopted

  New construction on unincorporated land inside Avon township, Lake County, Illinois.

  • Adopted by the Lake County Board for unincorporated areas only; municipal codes inside Avon township are not covered.
  • International Residential Code 2024 edition governs one- and two-family detached dwellings.
  • An automatic sprinkler system shall be installed in one- and two-family dwellings; sprinkler design requirements are set by the fire protection district where the project is located.
  • 2024 IBC, 2024 IEBC, 2024 IRC amendments and 2023 NFPA 70 amendments were adopted April 29, 2026 and take effect for unincorporated areas on July 12.

  “The Lake County Board has adopted the following building codes with amendments.”

• Local zoningVaries (with conditions)

  Unincorporated land inside Avon township, Lake County, Illinois: the Lake County Unified Development Ordinance (Chapter 151) provides the zoning districts. No Avon township-adopted zoning ordinance was located. Land inside incorporated municipalities within Avon township is regulated by those municipalities.

  • The UDO applies only to lands in unincorporated Lake County; municipalities regulate land within their own boundaries.
  • The county's Avon Township UDO zoning map was adopted April 11, 2000 and updated June 20, 2019.
  • Areas inside city and village boundaries are shown as not subject to county zoning on the county map.

  “These regulations apply only to lands in unincorporated Lake County. Municipalities regulate the lands located within their boundaries.”

• Who permits septicCounty (with conditions)

  Onsite sewage (septic) systems on properties inside Avon township, Lake County, Illinois, where the property has an existing septic system and is being altered or added to, as administered by the Lake County Health Department.

  • Property alterations or additions on septic properties must be reviewed and approved by the Lake County Health Department.
  • Municipal sewer connection rules inside incorporated areas were not verified.

  “Property alteration and/or addition projects on properties with a septic system or well must be reviewed and approved by the Lake County Health Department.”

• Well permitRequired

  Construction of new private, semi-private and non-community water wells on property inside Avon township, Lake County, Illinois.

  • The Water Well Program inspects each new well after completion and requires a satisfactory water sample result before final approval.
  • Permits are also required for sealing abandoned wells.

  “The Water Well Program issues permits for construction of all new private, semi-private and non-community water wells, and inspects each after its completion to assure it is constructed properly.”

• Subdividing landRegulated (with conditions)

  Subdivision of land on unincorporated parcels inside Avon township.

  • Subdivision rules are part of Lake County Chapter 151 for unincorporated land only.
  • Subdivision procedure details were not opened.

  “Regulations include: Zoning Subdivision Signs Site Development (Stormwater Detention, Erosion Control, Floodplain and Wetlands)”

• Permit processPartial

  Health Department permit process for septic and well work on property inside Avon township. The building-permit process was not located.

  • Plans may be reviewed at submission (counter review) or may need file and records research (submittal based).
  • Early assistance meetings are offered at no charge with a project manager.

  “Plans may be reviewed at the time of submission (counter review). Plans may also require file and records research (submittal based).”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Avon Township or Lake County directly.

• Owner-builder exemption — Owner-builder exemption from licensing or permit rules for homes on unincorporated land inside Avon township.
• Inspections — Building inspections for construction on unincorporated land inside Avon township.
• Certificate of occupancy — Certificate of occupancy for new homes on unincorporated land inside Avon township.
• Minimum dwelling size — Minimum dwelling size in unincorporated Avon township, residential districts.
• Minimum lot size — Minimum lot area for the main single-family residential (R-1) and agricultural/estate (AG, E) districts in unincorporated Avon 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.