Bolthole Index

Brown County, Illinois

Building permits, zoning and septic rules in Brown County, Illinois

83Index Score / 100
#1 of 102 in Illinois

Unincorporated Brown County, Illinois appears not to require a residential building permit, but obtain county confirmation because no published county rule states that answer directly1. Illinois has a statewide building-code baseline, and Mt. Sterling separately has building and zoning codes23. The Brown County Health Department administers septic permits, while water-well work also requires a permit45.

At a glance

Building permit
County records say not required in unincorporated areas, but obtain confirmation before building1
Zoning
Mt. Sterling zoning applies within the city and 1.5 miles beyond its limits; countywide zoning is not confirmed6
Septic permit
Required through the Brown County Health Department for a new, replacement or altered private sewage system74
Private well permit
Required for construction, modification or abandonment of a water well85
RV or tiny-home living
Unconfirmed on unincorporated private land; Mt. Sterling limits trailer and motor-home camps to specified districts with a special-use permit9
Owner-builder plumbing
Qualifying owner-occupants may do plumbing on their own single-family residence, but local plumbing permits can still apply1011
Floodway work
State authorization may be required before construction in a regulated floodway12
Septic soil suitability
30.2% of county soils lack severe limits for a conventional drain field13

Who to call

Septic permits

Brown County Health Department

Private sewage disposal applications and private water-well permit applications for Brown County

217-773-2714

120 E Main St. Mt. Sterling, IL 62353

Online permits →

Roads & driveways

Brown County Highway Department

County-highway construction, engineering, planning and maintenance; contact point for county-road access questions

217-773-2427

highway@browncoil.org

708 South Capitol Ave. Mt. Sterling, IL 62353

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Off-grid gear

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

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Do you need a building permit in Brown County, Illinois?

Available Brown County information classifies a residential building permit as not required in unincorporated Brown County, but the county's published ordinance page identifies Mt. Sterling's building code rather than stating the rule for unincorporated land13. Ask Brown County for direct confirmation before construction. Illinois does not issue building permits or perform building-code inspections for privately funded projects; any such requirement comes from the applicable local government1415. Illinois has imposed a statewide building-code baseline since 2025, though the residential and commercial requirements differ in jurisdictions without a locally adopted code2. Qualifying owner-occupants may perform plumbing on their own single-family residence, but that limited exemption is not a general exemption from building permits or other trades, and a local plumbing permit may still be required1011. Local inspections and certificates of occupancy remain unconfirmed16.

Who handles Brown County building permits and land questions?

Brown County does not publish a clearly identified building or zoning office, so use the county's main contact for a parcel-specific answer before construction. The Brown County Health Department is the confirmed office for private sewage and water-well applications; it is at 120 E Main St. in Mt. Sterling and can be reached at 217-773-271417. The Brown County Highway Department handles construction, engineering, planning and maintenance for county highways; it is at 708 South Capitol Ave. in Mt. Sterling, can be reached at 217-773-2427 or highway@browncoil.org, and is the practical contact for county-road access questions18. A driveway or other work within a state-maintained highway right-of-way requires an IDOT permit before work starts, so county and state-road access are separate questions19.

Does Brown County, Illinois have zoning?

Mt. Sterling's zoning code applies inside the city and within 1.5 miles of its corporate limits, so some land outside the city boundary may still fall under city zoning6. The code divides Mt. Sterling into residential, business, manufacturing and agricultural districts and requires structures and uses to conform, subject to a limited agricultural-building exception that still preserves applicable setbacks20. In the R-1 district, the standard minimum is 7,200 square feet of lot area per family and 40 feet of average frontage, with an exception for qualifying preexisting lots21. A mobile home on a permanent mobile-home park subdivision lot must have at least 500 square feet of ground-floor area, excluding open porches, breezeways and garages22. Those city rules do not establish zoning or dimensions for the rest of unincorporated Brown County, where countywide zoning remains unconfirmed23.

How do septic and well permits work in Brown County?

The Brown County Health Department provides the local septic application and permit process, while Illinois regulates private sewage disposal statewide4. A septic permit is required for new construction and for replacement or alteration of a private sewage disposal system, and the permit becomes void one year after issuance724. The licensed installer must notify the Health Department at least 48 hours before installation to schedule the final inspection25. Only 30.2% of Brown County soils lack severe limitations for a conventional drain field, so make the soil evaluation an early purchase contingency13. New private wells require permits under the state-local program, and Brown County's form also covers deepening, repair or sealing; construction or deepening requires at least two days' advance notice85.

Can you live in an RV or tiny home in Brown County?

Residential or long-term RV occupancy on private land in unincorporated Brown County could not be confirmed, so ask the county before buying for that use. Mt. Sterling allows trailer or motor-home camps only in specified agricultural districts with a special-use permit, but that camp rule does not answer whether one household may occupy an RV on unincorporated land9. Tiny-home occupancy and accessory dwellings in unincorporated Brown County also could not be confirmed. Mt. Sterling's 500-square-foot minimum applies specifically to mobile homes on permanent mobile-home park subdivision lots, not to every house or tiny home22. Illinois permits manufactured homes as dwellings subject to installation rules, while local zoning, floodplain and utility requirements may still apply26. Confirm septic or sewer service separately with the Brown County Health Department27.

Building a home in Brown County: the steps, in order

  1. Determine whether the parcel is within Mt. Sterling or its 1.5-mile zoning jurisdiction6.
  1. Ask Brown County to confirm in writing whether an unincorporated parcel needs a building permit, inspection or occupancy approval; available information says a residential building permit is not required, but no published county rule states that directly1.
  1. Identify the applicable Illinois baseline building-code requirements even if Brown County confirms that it issues no building permit2.
  1. Arrange the soil evaluation and obtain the septic permit before construction7.
  1. Obtain a private-well permit before well work if the site will not use public water5.
  1. Check floodway status, then ask the Highway Department about county-road access or IDOT about work in a state-highway right-of-way121819.
  1. Give the Health Department at least 48 hours' notice before septic installation for the final inspection25.

What should you check before buying land in Brown County?

Put soils, water, flood exposure and legal access ahead of the house plan. Only 30.2% of Brown County soils lack severe limitations for a conventional septic drain field13. Private-well work requires a permit, while public-water and sewer connection requirements remain parcel-specific and unconfirmed5. Construction in qualifying rural floodways requires state permission, and work where no floodway has been delineated may still require review anywhere in the floodplain12. Brown County land is 72.3% gentle terrain at 15% slope or less and 39.7% wooded, so access and clearing can vary sharply by tract2829. The effective property-tax rate is about 1.5%, with a median annual bill near $2,090 and a typical home value near $157,116303132. Confirm the deeded entrance and whether the frontage is on a county, township or state road before closing1819.

Watch-outs

  • Brown County's residential building-permit and countywide-zoning answers are not expressly confirmed by published county rules; obtain a parcel-specific answer before design or construction123.
  • RV living and tiny-home occupancy on unincorporated private land remain unconfirmed; Mt. Sterling separately regulates trailer and motor-home camps and sets a mobile-home size rule for permanent park lots922.
  • Only 30.2% of county soils lack severe limitations for a conventional septic drain field, so do not waive the soil and septic contingency13.

Sources

  1. Brown County - Code of Ordinances (Permits, Forms, and Zoning) (2026 county census)
  2. Building Codes and Regulations, quoted and re-checked
  3. Code of Ordinance – Brown County, quoted and re-checked
  4. browncoil.org, quoted and re-checked
  5. Health Department | Brown County, IL, quoted and re-checked
  6. Chapter 40 — Zoning Code, quoted and re-checked
  7. browncoil.org, quoted and re-checked
  8. Private Water & Closed Loop Wells, quoted and re-checked
  9. City of Mt. Sterling Zoning Code, Chapter 40, quoted and re-checked
  10. HB5913 Enrolled — Illinois Plumbing License Law amendment (2026 county census)
  11. 225 ILCS 320/18 — Local regulation; Department standards (Illinois statewide rule), quoted and re-checked
  12. Permit Program, quoted and re-checked
  13. 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
  14. Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
  15. Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
  16. Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
  17. Brown County Health Department (browncoil.org)
  18. Brown County Highway Department (browncoil.org)
  19. Highway Permits (Illinois statewide rule), quoted and re-checked
  20. Chapter 40 — Zoning Code, quoted and re-checked
  21. mtsterlingil.com, quoted and re-checked
  22. mtsterlingil.com, quoted and re-checked
  23. Brown County - Code of Ordinances (2026 county census)
  24. Brown County Health Department Application for Permit to Construct a Private Sewage Disposal System, quoted and re-checked
  25. Application for Permit to Construct a Private Sewage Disposal System, quoted and re-checked
  26. Manufactured & Modular Homes/Mobile Structures (Illinois statewide rule), quoted and re-checked
  27. browncoil.org, quoted and re-checked
  28. Share of land at 15% slope or less: Bolthole Index county data
  29. Wooded share of land: Bolthole Index county data
  30. Effective property tax rate: Bolthole Index county data
  31. Median property tax bill: Bolthole Index county data
  32. Typical home value (Zillow): Bolthole Index county data

Written October 10, 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.

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Compared with neighboring counties

Unlike 4 of its 6 neighbors, Brown County requires no county building permit for a home.

RuleBrown CountySchuyler CountyAdams CountyScott CountyCass CountyPike CountyMcDonough County
Building permitNot requiredNot requiredLimitedNot requiredRequiredRequiredLimited
County zoningNoNoYesNoYesYesNot published
Septic permitsCounty Health Dept.County Health Dept.County Health Dept.County Health Dept.County Health Dept.County Health Dept.County Health Dept.

County locator

Brown County in Illinois

83
County map
Brown County highlighted among the Illinois counties · colored by Index score

How Brown County scores

Seclusion78100% ev.
Self-Sufficiency72100% ev.
Admin Boringness8090% ev.
Durability70100% ev.
Property Autonomy42100% ev.
Carry Cost63100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$157kTypical home
1.5%Property tax
$6,571Land / acre
38.6"Annual rain
2.9% of yrsSevere drought
8.9 / yr (+8)Mid-century 100°F days
15.7 daysMid-century dry spell
1.94" (+7%)Mid-century 1-day rain
1.78×Wildfire change factor
100%Forward climate coverage
$1,457Home insurance / yr
1.8% / yrInsurance growth
1.69%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
6,638People within 30 min
627,633People within 2 hr
12,980Radius comparison (15 mi)
20.6People / sq mi
0%Federal land
72.3%Land at 15% slope or less
30.2%Soils rated "not limited" for septic (strict USDA rating)
58,119 acWorkable land screen
39.7%Wooded land
59.2 tonsBiomass / forest ac
52.8°FAvg temp

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Cities and towns in Brown County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Buckhorn Township · Cooperstown Township · Elkhorn Township · Lee Township · Missouri Township · Village of Mound Station · Mount Sterling · Mount Sterling Township · Pea Ridge Township · Ripley Township · Village of Ripley · Versailles Township · Village of Versailles

Answers from the rulebook for Brown County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Brown County rules

  • Who permits septicMixed (with conditions)

    Private sewage disposal systems in Brown County

    • IDPH regulates private sewage disposal statewide.
    • Brown County Health Department provides the local application and permit process.
    • The IDPH page states that local health agencies may review plans by local ordinance or as an agent of IDPH.
    “Private Sewage Disposal (SEPTIC) Systems Program”
    2 more reviewed findings on this topic
    • Mixed (with conditions) — Private sewage disposal systems in Brown County.
      “The Illinois Department of Public Health (IDPH) regulates the installation of all private sewage disposal systems that have no surface discharge (such as septic tanks and seepage fields) as well as those that discharge treated effluent up to 1,500 gallons per day to the ground surface (such as sand filters and aerobic treatment systems). Staff also review and approve plans for private sewage disposal systems and alternative private sewage disposal systems before construction. There are about 90 local health agencies in Illinois that also review sewage disposal system construction plans, either by authority of a local ordinance or as an "agent" of the Department.”
    • County — Private sewage disposal administration in Brown County through the Brown County Health Department.
      “I want information on installing and/or maintaining a septic system. Here is the application and Illinois code information you'll need: Brown County Septic Application”
  • Septic permitRequired

    Construction of a private sewage disposal system in Brown County.

    • The application covers new construction and replacement/alteration.
    • A surface discharge may also require an NPDES permit.
    • The permit is void after one year from the issue date.
    • The owner must maintain documentation required by 225 ILCS 225 and 77 Ill. Adm. Code 905.

    permit validity: 1 year from issue date

    “OFFICE USE ONLY: Based on information in this application, permit is hereby granted to construct a private sewage disposal system. NOTE: Permit is void after one (1) year from issue date.”
    One more reviewed finding on this topic
    • Required — Construction, replacement, or alteration of private sewage disposal systems in Brown County
      “Application for: ☐New Construction ☐Replacement/Alteration”
  • Septic inspectionRequired

    Final inspection of private sewage disposal system construction in Brown County.

    • The Illinois licensed installer must notify the Brown County Health Department at least 48 hours before installation to schedule the final inspection.
    • The form states that the Health Department does not warrant proper operation and that the installer or other responsible persons remain responsible for proper installation.

    advance notice: >= 48 hours

    “I also accept the responsibility of notifying the Brown County Health Department at least 48 hours prior to installation to schedule a final inspection of the sewage disposal system construction.”
    One more reviewed finding on this topic
  • Well permitRequired

    Construction, deepening, repair, or sealing of water wells in Brown County.

    • The official form is issued through the local health department.
    • The form covers private, semi-private, non-community, and non-potable wells and requires a licensed contractor certification.
    • The form states that construction or deepening must be notified to the Department, approved local health department, or approved unit of local government at least two days before work begins.

    advance notification: >= 2 days (before commencement of construction or deepening)

    “APPLICATION FOR PERMIT TO CONSTRUCT, MODIFY OR ABANDON A WATER WELL [...] Permit To: Deepen Repair Seal Dug Driven Bored Drilled [...] THREE COPIES ARE RETURNED TO THE LOCAL HEALTH DEPARTMENT WHERE THE PERMIT IS ISSUED”
  • Permit processPartial

    Private sewage permit process administered through the Brown County Health Department

    • The official process located is limited to private sewage disposal systems, not general building permits.
    • The installer must notify the Health Department at least 48 hours before installation for final inspection.
    • The permit is void after one year from issue date.

    advance inspection notice: >= 48 hours · permit validity: 1 year

    “NOTE: Permit is void after one (1) year from issue date.”
  • County-wide zoningAbsent

    Zoning regulations are published only for the City of Mt. Sterling (Chapter 40); no countywide zoning ordinance for unincorporated Brown County was found.

    Brown County - Code of Ordinances ↗Scouted from the county site, not yet independently re-checked

Illinois rules that apply here

  • Building permitLimited

    Privately funded construction in Illinois; the State does not itself issue building permits, while any required permit is addressed by the applicable local government.

    • Permit requirements may be imposed and administered by the municipality, village, city, or county having jurisdiction.
    • The Illinois Capital Development Board states that statewide building codes became effective 1/1/2025, while local code officials remain the best source for project-specific answers.

    statewide building-code effective date: 2025-01-01

    “No. If any of these are required, they would be addressed by the unit of local government.”
    One more reviewed finding on this topic
    • Not required — Issuance of building permits by the State of Illinois for privately funded construction.
      “No. If any of these are required, they would be addressed by the unit of local government.”
  • Owner-builder exemptionConditional

    Owner occupants or lessee occupants of single-family residences, and owners of single-family residences under construction for their own occupancy, performing plumbing planning, installation, alteration, or repair in Illinois.

    • The exemption is limited to plumbing work on the specified single-family residence; the cited statute does not establish a general owner-builder exemption for all construction trades or a statewide exemption from building permits.
    • The plumbing must comply with the minimum standards in the Illinois State Plumbing Code.
    • The plumbing is subject to inspection by the Illinois Department of Public Health or by the local governmental unit if it retains a licensed plumber as inspector.
    • The owner, owner occupant, or lessee occupant may not employ anyone other than a plumber licensed under the Illinois Plumbing License Law to assist.
    • An occupant must have taken possession of and be living in the premises as their bona fide sole and exclusive residence, or, for a residence under construction, expect to take possession and live there as that residence, with current intent to live there for at least 6 months after completion of the plumbing work or, for a residence under construction, at least 6 months after completion of construction.
    • Failure to possess and live in the premises as a sole and exclusive residence for 6 months or more creates a rebuttable presumption that the required intent was lacking.

    minimum occupancy period: >= 6 months (After completion of plumbing work; for a residence under construction, after completion of construction.)

    “Nothing herein contained shall prohibit the owner occupant or lessee occupant of a single family residence, or the owner of a single family residence under construction for his or her occupancy, from planning, installing, altering or repairing the plumbing system of such residence”
    2 more reviewed findings on this topic
    • Conditional — Privately funded construction in Illinois, including projects performed by an owner-builder, as to state-issued building permits, state plan review, state building-code inspections, and state occupancy permits.
      “No. If any of these are required, they would be addressed by the unit of local government.”
    • Conditional — Statewide treatment of local plumbing permits and inspections for qualifying owner occupants performing plumbing work on a single-family residence.
      “Nothing contained in this Act shall prohibit any city, town, village, township or county from providing for a Plumbing Inspector or from requiring permits for the installation and repair of plumbing and collecting a fee therefor, but a city, town, village, township, or county that requires a permit for installation and repair of plumbing may not issue that permit without verification that the applicant has a valid plumbing license or that the applicant is the owner occupant of a single family residence that is the subject of the permit.”
  • Building code adoptedPartial

    Building-code requirements statewide in Illinois, including residential and commercial construction subject to the Capital Development Board Act baseline requirements.

    • Effective 2025-01-01, Illinois requires statewide baseline building-code requirements.
    • Local governments may adopt building codes, but they are not required to adopt codes; jurisdictions that do not adopt a code are treated as non-building-code jurisdictions and must follow the applicable state-law baseline requirements.
    • For jurisdictions with adopted codes, local codes must regulate structural design at least as stringently as the applicable IRC, IBC, or IEBC baseline.
    • Commercial buildings in non-building-code jurisdictions and state-funded buildings are subject to the state-listed codes and qualified-inspection requirements.
    • Residential requirements differ depending on whether the jurisdiction has adopted a compliant building code and whether the home purchaser and builder agree to an alternative code.

    statewide baseline effective date: 2025-01-01 · local code structural minimum for residential buildings: IRC minimum structural requirements · local code structural minimum for commercial new buildings: IBC minimum structural requirements · local code structural minimum for existing commercial buildings: IEBC minimum structural requirements

    “The State of Illinois recently passed legislation (Public Act 103-0510) changing the Capital Development Board Act to require statewide building codes effective 1/1/2025. [...] Commercial buildings in jurisdictions that have not adopted a building code AND state funded buildings. [...] Starting 1/1/25 local codes must regulate the structural design in a manner that is at least as stringent as the IBC© for new buildings or IEBC© for existing buildings. [...] Residential buildings in jurisdictions that have not adopted a building code where agreed to by the home purchaser and home builder. [...] Residential buildings in jurisdictions that have adopted a building code. [...] Starting 1/1/25 local codes must regulate the structural design in a manner that is at least as stringent as the IRC©.”
    2 more reviewed findings on this topic
    • Adopted (with conditions) — Illinois statewide building-code baseline, including Brown County to the extent the state rules apply to the project type and jurisdiction.
      “The State of Illinois recently passed legislation (Public Act 103-0510) changing the Capital Development Board Act to require statewide building codes effective 1/1/2025.”
    • Adopted — Statewide baseline building-code requirements for residential construction in Illinois, including jurisdictions with and without locally adopted building codes.
      “Please be advised that the State of Illinois recently passed legislation (Public Act 103-0510) changing the Capital Development Board Act to require statewide baseline building codes effective 1/1/2025. Locally adopted building codes must comply with the requirements of the Act.”
  • InspectionsLimited

    Privately funded construction statewide in Illinois, as to inspections performed by the State rather than by a local authority having jurisdiction.

    • The Illinois Capital Development Board does not perform building-code inspections for privately funded construction.
    • If inspections are required, they are addressed by the applicable unit of local government.
    • A local municipality or county may be a non-building-code jurisdiction, in which case applicable state baseline requirements and inspection-certification provisions may apply.
    “No. If any of these are required, they would be addressed by the unit of local government.”
    One more reviewed finding on this topic
    • Not required — Building-code-compliance inspections performed by the State of Illinois for privately funded construction.
      “No. If any of these are required, they would be addressed by the unit of local government.”
  • Certificate of occupancyLimited

    Occupancy permits or certificates for privately funded construction in Illinois.

    • The State does not issue occupancy permits for privately funded construction.
    • If an occupancy permit is required, it is addressed by the applicable unit of local government.
    “No. If any of these are required, they would be addressed by the unit of local government.”
    One more reviewed finding on this topic
    • Not required — Issuance of occupancy permits or certificates by the State of Illinois for privately funded construction.
      “No. If any of these are required, they would be addressed by the unit of local government.”
  • SetbacksDistrict specific (with conditions)

    County zoning regulations for building or setback lines outside municipalities with municipal zoning ordinances.

    • The actual setback distances are established by applicable county zoning districts or other local ordinances.
    • Agricultural buildings may be required to conform to building or setback lines.
    “to establish building or setback lines”
  • Building heightDistrict specific (with conditions)

    County zoning districts outside municipalities with municipal zoning ordinances.

    • The applicable county zoning ordinance determines the actual height limit by district or use.
    • No single statewide height measurement was identified.
    “including height of buildings and structures”
  • Manufactured homesAllowed (with conditions)

    Occupancy of manufactured homes as dwellings, including occupancy in manufactured home communities regulated by IDPH.

    • Manufactured home communities with 5 or more sites must be licensed by IDPH, except communities located in home rule units.
    • IDPH annually inspects licensed communities for renewal, including water, sewage disposal, electrical systems, lighting, roads, spacing of homes, and garbage disposal.
    • Manufactured homes moved since January 1, 1980 must be secured using equipment meeting IDPH standards.
    • Effective December 31, 2001, manufactured homes must be installed by an Illinois licensed manufactured home installer or the homeowner and installed according to manufacturer instructions; if unavailable, the IDPH Manufactured Home Installation Code applies.
    • Local zoning, building, floodplain, and utility requirements may also apply.

    manufactured home community license threshold: >= 5 sites (Communities located in home rule units are excepted from this IDPH licensing statement.) · moved-home tiedown requirement effective date: >= 1980-01-01 · installation requirement effective date: >= 2001-12-31

    “designed and situated so as to permit its occupancy as a dwelling place for one or more persons”
  • Off-grid sanitationAllowed (with conditions)

    Off-grid disposal of human wastes through privies, portable toilets, recirculation toilets, incinerator toilets, and compost toilets statewide in Illinois.

    • Other domestic wastes must be disposed of in a conventional private sewage disposal system.
    • Compost toilets may also be used for other organic domestic wastes.
    • Privies have construction, capacity, venting, maintenance, and abandonment requirements.
    • A privy pit must have a minimum capacity of 50 cubic feet per seat.
    • A privy must be pumped when filled to within 18 inches of the bottom of the riser.
    • Vault privies are required where groundwater or limestone formations are within 4 feet of the bottom of the pit.
    • Recirculating toilets must meet NSF International/ANSI Standard 41 and residuals must go to an approved public or private sewage disposal system.
    • Incinerator and compost toilets have separate maintenance and disposal requirements; compost toilets must meet NSF International/ANSI Standard 41.

    privy pit minimum capacity: >= 50 cubic feet per seat · privy pumping trigger: <= 18 inches from bottom of riser (Pump when filled to within this distance.) · vault-privy groundwater or limestone separation: < 4 feet from bottom of pit (Watertight, non-metal vaults are required where the condition applies.)

    “Privies, portable toilets, recirculation toilets, incinerator toilets and compost toilets are approved for private sewage disposal of human wastes.”
  • Driveway accessRequired

    Work within the right-of-way of an Interstate, U.S. state route, Illinois state route, or state-maintained roadway, including access-driveway requests to State highways.

    • A permit must be obtained before work begins.
    • Requirements may vary by IDOT district; the applicant must contact the district office for specific requirements.
    • IDOT's access-driveway handbook guides what is allowable for highway access requests.
    “Per 605 ILCS 5/4 209, IDOT requires a permit when working within the right-of-way of an Interstate, U.S. state route, Illinois state route, or state maintained roadway. A permit must be obtained prior to the start of any work and a copy of the approved permit must be at the worksite at all times.”
  • Building in a floodplainRequired

    Construction activities in regulated Illinois floodways and, where a floodway has not been delineated, generally work anywhere in the floodplain.

    • For downstate streams, IDNR Division permitting applies to floodways of streams draining at least one square mile in urban areas or ten square miles in rural areas.
    • In northeastern Illinois, Part 3708 applies to identified floodways in Cook County excluding Chicago, DuPage, Kane, Lake, McHenry, and Will Counties.
    • Some minor activities are automatically authorized by statewide or regional permits if their terms and conditions are met.
    • For State-owned property, Part 3710 requires a permit for all development activity in FEMA-mapped floodplains.

    urban stream drainage area threshold: >= 1 square mile (regulated floodways under Part 3700) · rural stream drainage area threshold: >= 10 square miles (regulated floodways under Part 3700)

    “All construction activities in the floodways of streams (the channel and the adjacent portion of the floodplain that is needed to safely convey and store flood waters) in urban areas where the stream drainage area is one square mile or more or in rural areas where the stream drainage area is ten square miles or more must be permitted by the Division prior to construction.”
    One more reviewed finding on this topic
    • Required — Construction in applicable Illinois floodways, including applicable Brown County locations.
      “All construction activities in the floodways of streams (the channel and the adjacent portion of the floodplain that is needed to safely convey and store flood waters) in urban areas where the stream drainage area is one square mile or more or in rural areas where the stream drainage area is ten square miles or more must be permitted by the Division prior to construction.”
  • Short-term rentalsLimited

    Short-term rentals in Illinois where at least one room is rented for fewer than 30 consecutive days and accommodations are reserved in advance, when the hosting platform meets the statutory definition of a re-renter.

    • Beginning July 1, 2025, qualifying hosting platforms are subject to Hotel Operators’ Occupation Tax.
    • The source establishes tax and registration obligations, not statewide land-use permission; local zoning and licensing may separately apply.

    rental period: < 30 consecutive days

    “Beginning July 1, 2025, hosting platforms for short-term rentals that meet the definition of “re-renter” are subject to Hotel Operators’ Occupation Tax.”
  • Permit feesVariable (with conditions)

    Applications and written inquiries for Illinois Department of Natural Resources public-water, dam, and floodway work requiring authorization.

    • The Department reviews applications and written inquiries free of charge to determine whether authorization is required when sufficient information is provided.
    • A permit application fee may apply under the Department's permit fee schedule.
    “January 15, 2014, a new Permit Application Fee went into effect. All applications and written inquiries received will be reviewed free of charge to determine whether the Public Water, dam and/or floodway work proposed requires authorization by the Department, so long as sufficient information is provided for the Department to make that determination.”
  • Campground & park staysAllowed (with conditions)

    Overnight camping in Illinois campgrounds subject to the Campground Licensing and Recreational Area Act.

    • IDPH annually inspects and licenses campgrounds in Illinois.
    • The state campground definition includes camping and temporary parking of recreational vehicles.
    • Campgrounds within home rule units of government are exempt from the state campground licensing requirement.
    • Recreational areas without overnight camping, such as highway rest stops and picnicking areas, are subject to the rules but are not licensed or routinely inspected.

    minimum persons for statutory campground threshold: >= 10 persons · minimum camping duration for statutory campground threshold: >= 6 camping days per calendar year

    ““Camping Day” means any 24 hour period or portion thereof during which the participants remain overnight at the site.”
  • county building authorityLimited

    County building-construction and building-code regulation, including residential structures, in counties meeting the statutory population and metropolitan-area conditions.

    • The county must have a population not in excess of 1,000,000.
    • The county must be located in the area served by the Northeastern Illinois Metropolitan Area Planning Commission.
    • Rules are subject to rules or regulations adopted by the State Fire Marshal under the cited gasoline and volatile-oils statute.
    • The county must exempt municipalities located wholly or partly within the county when the municipal building code is equal to the county regulation and local authorities are enforcing that municipal code.
    • The rules apply throughout the county, but municipalities may establish higher standards.
    • The rules do not apply to construction or alteration of buildings or structures used or to be used for agricultural purposes on a tract zoned and used for agricultural purposes.
    • The county board must follow the publication and posting requirements in 55 ILCS 5/5-1063.
    • Beginning on the effective date of the amendatory Act of the 92nd General Assembly, a county adopting a new building code or amending an existing building code must provide the building-code identification to the Capital Development Board under Section 10.18 at least 30 days before adoption.
    • Violations are petty offenses, and enforcement is by an officer designated by county-board resolution.
    • The provision expressly authorizes county building-construction and building-code rules, but the opened text does not expressly use the phrase residential building permit requirement.

    population threshold: <= 1000000 persons (The county must be located in the area served by the Northeastern Illinois Metropolitan Area Planning Commission.) · pre-adoption identification period: >= 30 days (Applies to a new building code or amendment under the stated amendatory-Act provision.)

    “The county board in any county with a population not in excess of 1,000,000 located in the area served by the Northeastern Illinois Metropolitan Area Planning Commission may prescribe by resolution or ordinance reasonable rules and regulations (a) governing the construction and alteration of all buildings and structures and parts and appurtenances thereof and governing the maintenance thereof in a condition reasonably safe from the hazards of fire, explosion, collapse, contagion and the spread of infectious disease”
    One more reviewed finding on this topic
    • General — Illinois counties adopting and enforcing building codes and issuing building permits for residential construction in unincorporated areas, subject to the statewide baseline framework.
      “A municipality or county is not required to adopt building codes. If they do NOT adopt a building code then they are considered a non-building code jurisdiction and section 10.09-1 of the Capital Development Board Act (20 ILCS 3105) applies. If they do adopt a building code(s) then it must comply with section 10.18 of the Capital Development Board Act (20 ILCS 3105).”

Inside cities and towns in Brown County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

  • Building code adoptedAdopted (with conditions)

    The City of Mt. Sterling, Illinois; the county-hosted ordinance page identifies the City's revised ordinances and lists Chapter 6 as Building Code.

    • This source establishes a municipal Mt. Sterling building-code chapter, not a countywide building code for unincorporated Brown County.
    • The page states that the listed revised codes were supplemented January 1, 2019.
    “The Revised Codes of Ordinances (Supplemented January 1, 2019) of Mt. Sterling, Illinois establish the rules and regulations under which the City of Mt. Sterling operates are listed below. [...] Chapter 6: Building Code”
  • Local zoningPresent (with conditions)

    Land and structures within the City of Mt. Sterling, Brown County, Illinois.

    • The entire Municipality is divided into the listed zoning districts.
    • The zoning map establishes the district boundaries and is incorporated into the Code by reference.
    • No structure or part thereof may be erected, used, occupied, enlarged, altered, relocated, or reconstructed except in conformity with the Code.
    • Buildings or structures used or intended for agricultural purposes on agricultural land are exempt from the Code except that they must conform to applicable setback regulations; when a portion of a tract ceases to be used primarily for agricultural purposes, the pertinent Code provisions apply.

    zoning districts: R-1, R-2, R-3, B-1, M-1, M-2, A-1, A-2, A-3

    “40-3-1 ESTABLISHMENT OF DISTRICTS. In order to implement this Code, and to achieve the objectives in Article I, the entire Municipality is hereby divided into the following zoning districts:”
    2 more reviewed findings on this topic
    • Present (with conditions) — The City of Mt. Sterling; this is a municipal zoning rule and not a countywide Brown County rule.
      “The Revised Codes of Ordinances (Supplemented January 1, 2019) of Mt. Sterling, Illinois establish the rules and regulations under which the City of Mt. Sterling operates are listed below. [...] Chapter 40: Zoning Code”
    • Present (with conditions) — Structures and land uses within the City of Mt. Sterling corporate limits and within one and one-half miles of those limits.
      “40-1-3 JURISDICTION. This Code shall be applicable within the corporate limits of this Municipality and within one and one-half (1 ½) miles of the corporate limits.”
  • Zoning districtsPublished (with conditions)

    Mt. Sterling municipal zoning districts and zoning map.

    • The official county-hosted page identifies the material as Mt. Sterling city ordinances.
    • The page links a current zoning map and Chapter 40 Zoning Code.
    “Current Zoning Map [...] Chapter 40: Zoning Code”
  • Minimum dwelling sizeSpecified

    Mobile homes placed upon a permanent mobile home park subdivision lot within the City of Mt. Sterling.

    • The rule applies to each mobile home placed upon a permanent mobile home park subdivision lot.
    • Open porches, breezeways, and garages are excluded from the floor-area measurement.

    minimum ground floor area: >= 500 square feet (measured from the outside of exterior walls; excluding open porches, breezeways and garages)

    “(B) Minimum Floor Area. Each mobile home hereafter placed upon a permanent mobile home park subdivision lot shall have a total ground floor area of not less than five hundred (500) square feet as measured from the outside of exterior walls, including utility rooms, but excluding open porches, breezeways and garages.”
  • Minimum lot sizeSpecified

    Residential lots in the City of Mt. Sterling R-1 Low Density Residential District.

    • The minimum applies per family.
    • A lot of record with less area or width than required may be used for any purpose permitted in the Article if it was duly recorded before the zoning code's passage.

    minimum lot area per family: >= 7200 square feet (Preexisting duly recorded lots may be used as provided in the cited exception.) · minimum average lot frontage: >= 40 feet (Preexisting duly recorded lots may be used as provided in the cited exception.)

    “seven thousand two hundred (7,200) square feet per family”
  • Living in an RVLimited

    Trailer or motor-home camps within the City of Mt. Sterling.

    • Trailer or tourist camps are allowed only in A-1 and A-2 districts by special-use permit.
    • The number of trailers or motor homes may not exceed the total site square footage divided by 1,200.
    • At least 20 feet must be maintained between buildings, trailers, and trailers and buildings.
    • Tourist cabins must have at least 200 square feet of enclosed floor area and specified heating and plumbing facilities.
    • Sanitary and water-supply facilities require Health Officer approval.
    • A camp permit is not granted until plans are approved by the Health Officer.

    minimum separation: >= 20 feet (between buildings, trailers, and trailers and buildings) · maximum trailer or motor-home density: per 1 per 1,200 square feet of site area · minimum tourist cabin enclosed floor area: >= 200 square feet

    “Trailer or tourist camps, but only in the “A-1”, and “A-2” Districts; provided that: - The number of trailers or motor homes, or both shall not exceed the number obtained by dividing the total square foot area of the site of 1200.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Lot coverage — Lot coverage in unincorporated Brown County
  • Camping on your land — Temporary camping on private land in unincorporated Brown County
  • Tiny homes — Tiny-home occupancy in unincorporated Brown County
  • Accessory dwellings — Accessory dwellings in unincorporated Brown County
  • Mandatory utility hookup — Water and sewer connection requirements for unincorporated Brown County
2 more unanswered
  • Agricultural exemption
  • Subdividing land

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.

Living off-grid in Brown County, Illinois

Is Brown County a good place to live off-grid or homestead?

Brown County scores 83/100 on the Bolthole Index, a strong county profile. Its strengths: low administrative friction for a quiet rural property and sparse surroundings — about 6,638 people within a 30-minute drive.

Do you need a building permit in Brown County, Illinois?

Brown County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Brown County Health Department. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Brown County, Illinois?

Land in Brown County runs about $6,571 per acre, based on the latest county data.

What is the water situation in Brown County?

Brown County gets about 38.6" of rain a year, with severe drought in roughly 2.9% of years.

How remote is Brown County?

A representative private-land location has about 6,638 people within a 30-minute drive and 627,633 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Brown compares in Illinois

Compare side-by-side →See all 102 Illinois counties ranked →