Bolthole Index

Fulton County, Illinois

Building permits, zoning and septic rules in Deerfield Township, Illinois

Deerfield Township, in Fulton County, Illinois, appears to be covered by Fulton County zoning, which requires a zoning permit (formerly called a building permit) before construction1. We could not confirm that the township runs its own zoning or building department, so confirm with the Fulton County Planning & Zoning office2. Septic and well permits come from the Fulton County Health Department3.

At a glance

Building permit
County zoning permit required before construction; it is a zoning permit, not a full building-code inspection14
Zoning
Fulton County zoning appears to cover the township; not confirmed whether the township adopts its own5
Septic
Permit required from the Fulton County Health Department before work starts36
Wells
Well and/or septic permit from the county health department comes before the zoning permit7
RV living
Only RV parks are addressed (conditional use in the AC district); living in an RV on your own land is unconfirmed8
Manufactured homes
Must be built after June 15, 1976 and bear the HUD seal9
Driveway
County road entrance needs a permit from the county highway department10
Property tax
Fulton County effective rate about 2.1%11

Who to call

Building permits

Fulton County Planning & Zoning

Zoning permits, zoning questions, certificates of occupancy or completion, and county floodplain administration

(309) 547-0902

[email protected]

257 West Lincoln Street Lewistown, IL 61542

Septic permits

Fulton County Health Department Environmental Health

Septic permits, private-well permits and testing

309-647-1134

700 East Oak Street

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

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Do you need a building permit in Deerfield Township, Illinois?

Building in Deerfield Township, Fulton County, requires a zoning permit from the county zoning office before construction, substantial alteration or installation of a manufactured home4. The county says this permit was formerly called a building permit, but it is a land-use permit rather than a full building-code inspection permit1.

The zoning office reviews your plans for use, setback, height, parking and land coverage, and a denial can go to the Zoning Board of Appeals12. When construction ends, you must receive a certificate of occupancy from the zoning enforcement officer before you legally occupy a new dwelling13. Illinois requires statewide baseline building codes from 2025, and the local code official, not the state, is the authority for private projects14. We could not confirm whether Fulton County or the township adopts a building code of its own, so ask the zoning office.

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

Fulton County Planning & Zoning in Lewistown issues the zoning permit that applies to Deerfield Township parcels governed by county zoning2. The office is at 257 West Lincoln Street, Lewistown, phone (309) 547-0902, email [email protected]2.

We did not find a Deerfield Township office that issues building permits or zoning approvals. The Village of Deerfield (Lake County, near Chicago) is a different government and its rules do not apply here. Residents of Fulton County's incorporated communities are told to contact their own city or village hall instead15; if your parcel sits inside one of those communities, call that hall.

Does Deerfield Township have zoning, and what does it mean for RVs, manufactured homes and lot size?

Unincorporated Fulton County is divided into five zoning districts: AC, R-1, R-2, B and I5. County zoning appears to cover Deerfield Township, but we could not confirm the district for any particular parcel or whether the township adopts its own zoning, so confirm your parcel's district with the zoning office2.

In the AC (agriculture/conservation) district, the lot table appears to call for 43,560 square feet and 150 feet of width per dwelling, which drops to 20,000 square feet and 100 feet where public water is available16. Inhabited mobile homes must be built after June 15, 1976 and bear the HUD seal, with skirting and certified anchors9. Recreational vehicle parks and camper parks are a conditional use in AC8. Living in an RV on your own land is not addressed in what we found; ask the zoning office before you try it. Tiny homes and setbacks are also unconfirmed.

How do septic permits work in Deerfield Township?

The Fulton County Health Department, not the township and not the zoning office, issues septic permits in Deerfield Township, and it is unlawful to build, alter or extend a private sewage system without one3. The permit must be in hand before work starts, and the application needs a scaled site plan and soil investigation results6. A permit is valid for 1 calendar year6. The health officer must inspect and approve the installation in writing before it is covered17.

The health officer may refuse a septic permit if a public or community sewer is within 200 feet of the property18. Aerobic treatment plants are allowed only when no other approved system fits the property19. Across Fulton County, about 38.6% of soils rate as not limited for a conventional drain field, a strict rating, so many lots will need a site evaluation or an engineered system20. Call Environmental Health at 309-647-113421.

Building a home in Deerfield Township: the steps, in order

  1. Ask Fulton County Planning & Zoning which district your parcel is in and whether county zoning applies2.
  2. Get the well and/or septic permit from the Fulton County Health Department; it comes before the zoning permit and before construction7.
  3. Apply for the zoning permit with the well and septic permit numbers; the base fee for a dwelling or manufactured home is $125 plus $0.25 per square foot, and a mobile home is $50022.
  4. If the driveway meets a county road, file an entrance permit with the Fulton County Department of Public Works & Highways10.
  5. Have the health officer inspect the septic system before it is covered17.
  6. Request your certificate of occupancy (or certificate of completion) from the zoning office when the work is done13.

What stays with Fulton County, and what to check before you buy in Deerfield Township

Septic permits, well permits and driveway permits for county roads stay with Fulton County offices whatever the township does3710. For a state road or a township road, contact that road's owner instead10. Building in a special flood hazard area is prohibited unless you meet strict construction rules, and the county zoning officer acts as Floodplain Administrator23.

Fulton County's effective property tax rate is about 2.1%11, and the typical home insurance premium is about $1,501 a year24. For land outside the township, see the Fulton County page.

Watch-outs

  • We could not confirm whether Deerfield Township adopts its own zoning, so ask Fulton County Planning & Zoning before you rely on the county's district rules2.
  • The county's lot-size and mobile-home size tables are hard to read in the published ordinance, so confirm the numbers for your district with the zoning office before you buy16.
  • Search results for Deerfield often show the Village of Deerfield in Lake County, a different government whose rules do not apply here15.
  • We could not confirm whether the county or township enforces a building code beyond zoning review, so ask the zoning office who the code official is25.

Sources

  1. Fulton County - Obtaining a Zoning Permit (2026 county census)
  2. Fulton County Planning & Zoning (fultoncountyil.gov)
  3. Fulton County Health Ordinance Part II - Private Sewage Disposal Ordinance (Deerfield Township), quoted and re-checked
  4. Fulton County Zoning Ordinance, quoted and re-checked
  5. Complete Zoning Ordinance with Index, quoted and re-checked
  6. Fulton County Health Ordinance Part II - Private Sewage Disposal Ordinance (Deerfield Township), quoted and re-checked
  7. Fulton County Planning & Zoning Officer - Zoning FAQ (Deerfield Township), quoted and re-checked
  8. Fulton County Zoning Ordinance of 2009 (complete, with index) (Deerfield Township), quoted and re-checked
  9. Fulton County Zoning Ordinance of 2009 (complete, with index) (Deerfield Township), quoted and re-checked
  10. Fulton County Highway FAQ, quoted and re-checked
  11. Effective property tax rate: Bolthole Index county data
  12. Fulton County Zoning Ordinance, quoted and re-checked
  13. Fulton County Planning & Zoning Officer - Zoning FAQ (Deerfield Township), quoted and re-checked
  14. Building Codes and Regulations, quoted and re-checked
  15. Communities with Zoning, quoted and re-checked
  16. Fulton County Zoning Ordinance of 2009 (complete, with index) (Deerfield Township), quoted and re-checked
  17. Fulton County Health Ordinance Part II - Private Sewage Disposal Ordinance (Deerfield Township), quoted and re-checked
  18. Fulton County Health Ordinance Part II - Private Sewage Disposal Ordinance (Deerfield Township), quoted and re-checked
  19. Fulton County Health Ordinance Part II - Private Sewage Disposal Ordinance (Deerfield Township), quoted and re-checked
  20. 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
  21. Fulton County Health Department Environmental Health (fultoncountyhealth.com)
  22. Zoning Permit Application and Fee Schedule, quoted and re-checked
  23. Floodplain Administration, quoted and re-checked
  24. Typical home insurance premium: Bolthole Index county data
  25. Zoning Permit Application and Fee Schedule, quoted and re-checked

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 Deerfield Township

Rules another office applies inside Deerfield Township

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

  • Certificate of occupancyRequired

    Occupancy of a new structure, building or dwelling in Deerfield township, Fulton County, IL, where Fulton County zoning governs the parcel

    • Applies only if Fulton County zoning governs the parcel.
    • If the structure is not subject to occupancy, the zoning officer issues a certificate of completion instead.
    “in order to legally occupy a new structure/building/dwelling, you must receive a “certificate of occupancy” from the zoning enforcement officer. if your structure is not subject to occupancy, the zoning officer will issue a “certificate of completion”.”
  • Minimum lot sizeSpecified

    Minimum lot size for a dwelling in the AC (agriculture/conservation) district of Fulton County zoning, inside Deerfield township if county zoning governs

    • Column mapping (AC = 150 ft width / 43,560 sq ft area) is inferred from the garbled extracted table; confirm against the printed table in section 11.
    • In the AC district, minimum lot area per dwelling may be reduced to 20,000 square feet and the lot width to 100 feet where public water service is available.
    • In the AC district, the reduction goes to 15,000 square feet and 80 feet where public water and public sewer are both available and the Fulton County Health Department gives written permission.
    • Existing lots of record with less area may be used for one-family dwellings only after a zoning board of appeals variance and written health department permission.

    minimum lot area per dwelling: >= 43560 square feet (reduced to 20,000 sq ft with public water service) · minimum lot width: >= 150 feet (reduced to 100 ft with public water service)

    “zoning district lot width in feet lot area in square feet ac r-1 r-2 b i 150 50 50 none none 43560 5000 5000 none none”
    One more reviewed finding on this topic
    • Specified — Minimum lot size for a single-family dwelling in the R-1 (residential) district of Fulton County zoning, inside Deerfield township if county zoning governs
      “zoning district lot width in feet lot area in square feet ac r-1 r-2 b i 150 50 50 none none 43560 5000 5000 none none”
  • Living in an RVLimited

    Recreational vehicle parks or camper parks in the AC (agriculture/conservation) district of Fulton County zoning, which covers Deerfield township if county zoning governs

    • Listed among AC district uses requiring a conditional use permit; the extracted text does not cleanly separate permissive from conditional uses at that point, so verify the printed use table.
    • The use requires a detailed site plan drawn to scale showing drainage, topography, and the location of existing and proposed wells and sewage disposal systems.
    • Living in an RV on private land outside a park is not addressed in the opened pages.
    • Park-type RV use is also subject to the health department septic permit.
    “off-highway vehicle parks as contemplated by the recreational trails of illinois act, recreational vehicle parks, and/or camper parks and the conditions they would be subject to: a. reserved. b. a detailed site plan drawn to scale (one inch equals 200 feet) showing: i. drainage plan and topography. ii. location of existing and proposed wells and sewage disposal systems.”
  • Manufactured homesLimited

    Mobile or manufactured homes used as dwellings in Deerfield township, Fulton County, IL, where Fulton County zoning governs

    • All inhabited mobile homes in Fulton County must be built after June 15, 1976 and bear the HUD seal of approval, unless otherwise permitted by local ordinance or located in a mobile home park with a conditional use permit.
    • Mobile homes must have skirting, certified anchors, and satisfactory water, sewer and electrical connections, and wheels and hitches removed.
    • Mobile homes may not be used as accessory buildings.
    • Mobile home parks require a conditional use permit, a 10-acre minimum, and lots of at least 5,000 square feet.
    • The size and width table for each district (AC, R-1, R-2, B, I) is garbled in the extracted text; verify the printed table in section 5.

    manufactured width, R-1 residential district: >= 24 feet (mobile home is a permissive use in R-1 only at this width) · built after: June 15, 1976 (must also bear the HUD seal of approval)

    “all inhabited mobile homes located within fulton county must be built after june 15, 1976 and bear the hud seal of approval”
  • Who permits septicCounty (with conditions)

    Private sewage disposal (septic) systems inside Deerfield township, Fulton County, IL, administered by the Fulton County Health Department

    • Applies inside Deerfield township because the ordinance applies to the whole county.
    • The county ordinance adopts by reference the state of Illinois private sewage disposal licensing act and code and the private sewage mound code.
    “it shall be unlawful for any person to construct, renovate, alter, or extend a private sewage disposal system within the county unless he/she holds a valid permit issued by the fulton county health department”
  • Septic permitRequired

    Construction, renovation, alteration or extension of a private sewage system inside Deerfield township, Fulton County, IL

    • Permit must be issued by the Fulton County Health Department before any construction, renovation, alteration or extension starts; the property owner is responsible.
    • Applications require a scaled site plan, soil investigation results, number of bedrooms or design volume, and the signed owner's name and address.
    • Permits are not transferable and apply only to the location for which they are issued.
    • The health officer may refuse a permit if a public or community sewer under Illinois EPA jurisdiction is within 200 feet of the property.

    permit validity: 1 calendar year (from date of issuance)

    “a permit is valid for 1 calendar year from the date of issuance.”
  • Septic inspectionRequired

    Installed private sewage systems inside Deerfield township, Fulton County, IL

    • The health officer must inspect and approve the installation in writing before the system is covered or placed in operation.
    • The owner or occupant must give the health officer access for inspections.
    • The county recommends, but does not require, an inspection of private sewage systems at sale of a property.
    “any private sewage disposal system that has been installed shall not be covered or placed in operation until the installation has been inspected and approved in writing by the health officer.”
  • Off-grid sanitationLimited

    Off-grid (non-sewered) wastewater disposal for a home inside Deerfield township, Fulton County, IL

    • Allowed only as a county-permitted private sewage system; no unpermitted off-grid sanitation is allowed.
    • Aerobic treatment plants are allowed only for year-round residences, must be NSF/ANSI 40 listed, and need an active maintenance contract with an authorized service representative.
    • An aerobic plant may be installed only if the health officer determines no other approved system can be installed on the property.
    • Installers, pumpers and homeowners doing their own installation must be registered with the Fulton County Health Department.
    “an aerobic treatment plant can only be installed if the health officer has determined that no other approved private sewage disposal system can be installed on that propert”
  • Well permitRequired

    Well and/or septic installations for a new structure inside Deerfield township, Fulton County, IL

    • The county FAQ says a well and/or septic permit from the Fulton County Health Department is needed before a zoning permit and before construction.
    • No separate well-construction ordinance was found in the opened pages; the well permit rule is inferred from the FAQ wording.
    • Well and septic are handled by the health department's Environmental Health Division.
    “before a zoning permit can be issued, and before construction can start, you must obtain a well and/or septic permit from the fulton county health department.”
  • Mandatory utility hookupConditional

    New home served by a private septic system inside Deerfield township, Fulton County, IL, where public sewer may be available

    • No county rule was found that requires a new home to connect to public water or sewer in Deerfield township.
    • The health officer may refuse a septic permit if a public or community sewage system under Illinois EPA jurisdiction is within 200 feet of the property.
    • The septic permit application must show the location of any sanitary sewer available within 200 feet of the property.
    • In the AC district, lot area and width may be reduced where public water service is available (see minimum lot size claims).

    distance to public or community sewer that triggers permit refusal: <= 200 feet (public or community sewage system under Illinois EPA jurisdiction)

    “or if a public or community sewage system under the jurisdiction of the illinois environmental protection agency is within 200 feet of the property.”
  • Subdividing landRegulated (with conditions)

    Creating new lots by subdivision or plat inside Deerfield township, Fulton County, IL

    • Plats go through the county plat officer; areas outside plat officer review submit directly to the health officer.
    • Each lot must have soil analysis by a qualified soil classifier or engineer and room for the septic system.
    • Where soil cannot absorb liquids, the subdivision must use a sewer system connected to a community sewage system approved by Illinois EPA.
    • The final plat must be signed by the health officer before approval.
    “the final plat must be signed by the health officer to indicate that all provisions of this ordinance, the private sewage disposal licensing act and code, and all rules and regulations as established by the board of health have been met.”

Still unanswered

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

  • Owner-builder exemption — Owner-builder exemption from permits in Deerfield township, Fulton County, IL
  • Building code adopted — Adoption of a building code for new construction in Deerfield township, Fulton County, IL
  • Inspections — Building (non-septic) inspections for new construction in Deerfield township, Fulton County, IL
  • Local zoning — Whether Deerfield township, Fulton County, IL adopts and administers its own zoning ordinance
  • Minimum dwelling size — Minimum living area of a site-built or manufactured dwelling in Deerfield township, Fulton County, IL, where county zoning governs
10 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Agricultural exemption
  • Driveway access
  • 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 Deerfield Township publishes no rule on the point, not that none exists. Fulton County’s page lists the county offices to call.

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