Bolthole Index

Boone County, Illinois

Building permits, zoning and land rules in Boone County, Illinois

23Index Score / 100
#102 of 102 in Illinois

Unincorporated Boone County, Illinois requires building permits from the county Building & Zoning Department and zoning approval under the county ordinance; incorporated municipalities may administer separate zoning rules1,2. Septic permits and well permits throughout Boone County come from the Boone County Health Department3,4. Most structures need Health Department site-plan approval before the building permit is released1.

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

Unincorporated Boone County, Illinois requires building permits administered by the Boone County Building & Zoning Department; applications go online, and permits are released after review approval and payment.

Unincorporated Boone County, Illinois requires building permits administered by the Boone County Building & Zoning Department; applications go online, and permits are released after review approval and payment1,11. Decks, porches and piers specifically require building permits, with deck inspections at footing, rough-in and final stages11. Boone County lists the 2021 International Building, Residential, Mechanical and Fuel Gas Codes, the 2024 Illinois Energy Conservation Code, the 2020 National Electrical Code and the 2014 Illinois Plumbing Code, with local amendments1. Most structures also need Health Department site-plan approval before permit release1. Illinois leaves privately funded construction permits and code inspections to the applicable local government12.

Who is the Boone County building department, and how do you reach them?

Boone County's Building & Zoning Department is the building department for unincorporated Boone County.

Boone County's Building & Zoning Department is the building department for unincorporated Boone County1. Reach it at 815.544.6176 or building@boonecountyil.gov, at 1212 Logan Avenue, Suite 101 in Belvidere, Monday through Friday, 8:00 a.m. to 4:30 p.m1.. Building applications go through CloudPermit; after review, the permit is released once the application is approved and payment is received1. Missing information can delay review1. The available county material does not give a complete building-permit fee schedule2. For zoning verification and lot-of-record questions, call Planning at 815-547-66982. Septic and private-well permits go to the Health Department - Environmental Center at (815) 544-2951, extension 23.

Does Boone County have zoning?

The Boone County Zoning Ordinance regulates land uses and development in unincorporated Boone County; incorporated municipalities may administer separate zoning rules.

The Boone County Zoning Ordinance regulates land uses and development in unincorporated Boone County; incorporated municipalities may administer separate zoning rules2. Boone County publishes an interactive zoning map, an unincorporated zoning map and a table of permitted uses to help identify the parcel’s district and allowed uses2. County zoning also establishes setback lines; ask the zoning inspector for the property’s setback requirements before laying out a deck or home2. Confirm zoning with the Planning Department before starting septic, well or building applications, because a building permit cannot be issued without proper zoning3. A zoning verification letter costs $50 and a lot-of-record determination costs $752. Subdivision properties may require additional association approvals1.

How do septic permits work in Boone County?

New and replacement private septic systems in Boone County require a plan and permit from the Boone County Health Department - Environmental Center.

New and replacement private septic systems in Boone County require a plan and permit from the Boone County Health Department - Environmental Center3. The published plan-review time is 5–10 business days, and the application fee is paid when the plan is submitted2,3. Systems must meet state and county private sewage codes, and installers must be licensed by Illinois and Boone County3. Notify the Health Department 48 hours before installation and leave the system uncovered until inspection and approval3. An unlicensed homeowner installer must pay for two additional compliance inspections3. The septic plan and permit must be approved before installation and before the county issues a building permit3. A well permit must be obtained before well construction, sealing, deepening or modification begins4.

Can you live in an RV or tiny home on your land in Boone County?

In unincorporated Boone County’s residential and agricultural districts, RVs not designed for permanent residency may be parked behind the building line or in permitted accessory structures; front-yard parking is limited to 48 hours for maintenance, packing or unpacking.

In unincorporated Boone County’s residential and agricultural districts, RVs not designed for permanent residency may be parked behind the building line or in permitted accessory structures; front-yard parking is limited to 48 hours for maintenance, packing or unpacking5. That parking provision does not establish permission to live in an RV; ask the Planning Department about occupancy for your parcel2,5.

For dwellings in unincorporated Boone County, A-1, A-2 and R-1 require 860 square feet for a one-story dwelling and 720 square feet for a two-story dwelling6,7,8. RC requires ground-floor area of 1,200 square feet for a one-story dwelling or 1,000 square feet for a two-story dwelling; RC-2 requires floor area of 800 or 720 square feet, respectively9,10. Existing-lot and grandfathered-right provisions may affect development, but adequate sewage treatment remains required6,7,8,9,10. We could not confirm how Boone County classifies tiny homes; ask Planning before buying a unit2. Illinois approves compost and incinerator toilets for human waste, but other domestic wastewater still needs a conventional private sewage disposal system13.

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

Confirm the parcel's zoning with the Boone County Planning Department; proper zoning is required before a building permit can issue.

  1. Confirm the parcel's zoning with the Boone County Planning Department; proper zoning is required before a building permit can issue3.
  2. If the parcel is in a subdivision, ask the association about additional approvals or permits1.
  3. Submit the septic plan and private-well application, when needed, to the Health Department; the septic review is published as 5–10 business days3.
  4. Submit the building application through CloudPermit with complete plans; missing information can delay review1.
  5. After approval, pay the required amount so the Building & Zoning Department can release the permit1.
  6. Schedule required inspections; deck inspections occur at footing, rough-in and final stages11.
  7. Give the Health Department 48 hours' notice before septic installation and leave the system uncovered until inspection and approval3.
  8. Ask the Boone County Highway Department about access if the driveway meets a county road; the department lists Boone County Highway Access Permits14.

What to check before you buy land in Boone County

Residential lot standards in unincorporated Boone County depend on zoning: A-1 lists a 2-acre minimum for residential lots under 5 acres and a 5-acre minimum for lots of 5 acres or more, with an exception for certain existing residences and possible grandfathered-lot provisions.

Residential lot standards in unincorporated Boone County depend on zoning: A-1 lists a 2-acre minimum for residential lots under 5 acres and a 5-acre minimum for lots of 5 acres or more, with an exception for certain existing residences and possible grandfathered-lot provisions6. A-2 lists a 2-acre minimum and 5-acre maximum7. R-1 normally requires 1 acre; a smaller lot needs Health Department approval of public or private sewerage under state standards, with at least 15,000 square feet and 75 feet of width at the building line8. RC requires 32,000 square feet, while RC-2 requires 5,000 square feet9,10. Existing-lot provisions may affect development in A-2, RC and RC-2, and adequate sewage treatment remains required7,9,10.

Only about 24.9% of Boone County soils avoid severe limitations for conventional septic drain fields, so confirm septic feasibility before closing15. The effective property-tax rate is about 2.3%, and the median annual bill is about $4,50715.

Watch-outs

  • We could not confirm a general Boone County owner-builder exemption from building permits; Illinois’ owner-occupant plumbing exemption is limited to qualifying plumbing work and does not waive local building permits or all plumbing inspections16,17.
  • Boone County’s RV parking rule does not authorize residential occupancy; ask the Planning Department about RV living or temporary camping before relying on either for housing during construction2,5.

Sources

17 official pages, each quoted and re-checked · written October 10, 2026

  1. Building & Zoning
  2. Boone County Zoning Information
  3. Private Sewage Disposal
  4. Potable Water/Wells
  5. Section 5.1.8. Recreational vehicles and trailer regulations
  6. Section 3.2.4. A-1 lot development standards
  7. Section 3.3.5. A-2 lot development standards
  8. Section 3.5.4. R-1 lot development standards
  9. Section 3.6.6. RC lot development standards
  10. Section 3.7.5. RC-2 lot development standards
  11. Building & Zoning
  12. Illinois Codes FAQ (Illinois statewide rule)
  13. 77 Ill. Adm. Code 905.130 Human Waste Disposal (Illinois statewide rule)
  14. Boone County Highway Department (boonecountyil.gov)
  15. 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
  16. HB5913 Enrolled — Illinois Plumbing License Law amendment (Illinois statewide rule)
  17. 225 ILCS 320/18 — Local regulation; Department standards (Illinois statewide rule)

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

Like all 6 of its neighbors, Boone County has countywide zoning.

RuleBoone CountyWinnebago CountyMcHenry CountyOgle CountyKane CountyDeKalb CountyLake County
Building permitRequiredRequiredRequiredLimitedRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Health Dept.County Health Dept.County Dept. of HealthCounty Health Dept.County Health Dept.County Health Dept.County Health Dept.

County locator

Boone County in Illinois

23
County map
Boone County highlighted among the Illinois counties · colored by Index score

How Boone County scores

23 / 100 · #102 of 102 in Illinois · six factors, land price, tax, rain and climate

Seclusion7100% ev.
Self-Sufficiency27100% ev.
Admin Boringness4390% ev.
Durability74100% ev.
Property Autonomy42100% ev.
Carry Cost51100% 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 →

$291kTypical home
2.3%Property tax
$9,226Land / acre
37.4"Annual rain
6.3% of yrsSevere drought
3.5 / yr (+3.4)Mid-century 100°F days
13.7 daysMid-century dry spell
1.79" (+6.9%)Mid-century 1-day rain
1.71×Wildfire change factor
100%Forward climate coverage
$1,680Home insurance / yr
4.3% / yrInsurance growth
1.14%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
450,376People within 30 min
13,339,076People within 2 hr
243,809Radius comparison (15 mi)
189.5People / sq mi
0.1%Federal land
99.8%Land at 15% slope or less
24.9%Soils rated "not limited" for septic (strict USDA rating)
43,469 acWorkable land screen
9.7%Wooded land
25.1 tonsBiomass / forest ac
48.2°FAvg temp

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Cities and towns in Boone 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.

Not yet covered: Belvidere Township · Boone Township · Caledonia Township · LeRoy Township · Poplar Grove Township · Village of Poplar Grove

Answers from the rulebook for Boone County

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

Boone County rules

  • Building permitRequired

    Building construction and permitting in unincorporated Boone County

    • All permits must be submitted online.
    • A permit is released only after review approval and payment.
    • Most structures require Health Department site-plan approval before release.
    • Subdivision properties may require additional approvals or permits.
    • The cited page states that an address rejected by the system may not be within county jurisdiction.
    “Building permits are required for all decks/porches/piers within unincorporated Boone County.”
    2 more reviewed findings on this topic
    • Limited — Decks, porches, and piers in unincorporated Boone County.
      “Building permits are required for all decks/porches/piers within unincorporated Boone County.”
    • Required — Building permits administered by Boone County Building & Zoning in unincorporated Boone County.
      “As the Building Department for unincorporated Boone County, we are committed to the quality of construction within our jurisdiction. [...] A building permit will be released once the review is approved and payment has been received.”
  • Building code adoptedAdopted (with conditions)

    Boone County’s listed construction codes and local amendments for the county building jurisdiction.

    • The Building & Zoning page lists the 2021 International Building, Residential, Mechanical, and Fuel Gas Codes, the 2024 Illinois Energy Conservation Code, the 2020 National Electrical Code, the 2014 Illinois Plumbing Code, and Boone County local amendments.
    • The source does not state adoption dates for all listed codes.
    “Effective Boone County Codes 2021 International Building Code 2021 International Residential Code 2021 International Mechanical Code 2021 International Fuel Gas Code 2024 Illinois Energy Conservation Code (Commercial & Residential) 2020 National Electrical Code 2014 Illinois Plumbing Code Boone County Zoning Ordinance”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Boone County building regulation in unincorporated areas
      “Effective Boone County Codes 2021 International Building Code 2021 International Residential Code 2021 International Mechanical Code 2021 International Fuel Gas Code 2024 Illinois Energy Conservation Code (Commercial & Residential) 2020 National Electrical Code 2014 Illinois Plumbing Code Boone County Zoning Ordinance”
  • InspectionsRequired

    Residential deck inspections in unincorporated Boone County

    • For decks, footing inspection occurs after holes are dug and before concrete is poured; rough-in inspection occurs when sub-framing is complete and before decking and guardrails; final inspection occurs when the deck is completed and before occupancy.
    “Required inspections: 1. Footing: After holes are dug, but before concrete is poured. 2. Rough-In: When sub-framing is complete, but prior to installation of decking and guardrails. 3. Final: When deck is completed, but before occupancy.”
  • County-wide zoningPresent (with conditions)

    Zoning regulation in unincorporated Boone County.

    • The ordinance was adopted July 9, 2008, with amendments as of November 18, 2015.
    • The source describes regulation of the unincorporated portion of Boone County.
    “The Boone County Zoning Ordinance was adopted by the Boone County Board on July 9, 2008, with amendments as of November 18, 2015.”
    One more reviewed finding on this topic
    • Present (with conditions) — Boone County zoning in unincorporated areas
      “The Zoning Ordinance dividing Boone County into districts, regulating and restricting the location and use of buildings, structures and land for trade, industry, residence and other uses within these districts; regulating and restricting the intensity of such uses, and establishing setback lines in order to promote the orderly development of unincorporated portion of Boone County in accordance with the Official Comprehensive Plan and Illinois Complied Statutes.”
  • Local zoningPresent (with conditions)

    Zoning regulation administered by Boone County in the unincorporated portion of Boone County, Illinois.

    • The cited county source addresses the unincorporated portion of Boone County; incorporated municipalities may administer their own zoning rules.

    adoption date: July 9, 2008 · amendments date: November 18, 2015

    “The Zoning Ordinance dividing Boone County into districts, regulating and restricting the location and use of buildings, structures and land for trade, industry, residence and other uses within these districts; regulating and restricting the intensity of such uses, and establishing setback lines in order to promote the orderly development of unincorporated portion of Boone County in accordance with the Official Comprehensive Plan and Illinois Complied Statutes.”
  • Zoning districtsPublished (with conditions)

    Zoning districts and maps for unincorporated Boone County.

    • The county page links to a table of permitted uses, zoning maps, an interactive zoning map, and an unincorporated Boone County zoning map.
    • The page does not reproduce the complete district schedule or dimensional standards.
    “Table of Permitted Uses Section 3.16 Click Here! Zoning Maps are available for viewing here. Searching for the zoning of a property? Interactive Boone County Zoning Map Unincorporated Boone County Zoning Map”
  • Minimum dwelling sizeSpecified

    Residential uses in the A-1 Agricultural Preservation Area District.

    • Residential uses on lots under five acres are subject to the A-1 dimensional table.
    • Residential uses on lots of five acres or more are subject to the A-1 dimensional table.
    • Existing-lot and grandfathered-right provisions may affect development.
    • Adequate sewage treatment remains required.

    required floor area, one-story dwelling: 860 square feet (A-1 residential use) · required floor area, two-story dwelling: 720 square feet (A-1 residential use)

    “Required floor area: 1-story dwelling 860 square feet 2-story dwelling 720 square feet”
    9 more reviewed findings on this topic
    • Specified — Residential uses in the A-2 Agricultural Residence District.
      “Required floor area: 1-story dwelling 860 square feet 2-story dwelling 720 square feet”
    • Specified — Residential uses in the R-1 Single-Family Residential District.
      “Required floor area: 1-story dwelling 860 square feet 2-story dwelling 720 square feet”
    • Specified — Residential uses in the RC Residential Conservation Development District.
      “Required ground floor area: 1-story dwelling 1,200 square feet 2-story dwelling 1,000 square feet”
    • Specified — Residential uses in the RC-2 Residential Clustering District.
      “Required floor area: 1-story dwelling 800 square feet 2-story dwelling 720 square feet”
    • Specified — Residential uses in A-1 Agricultural Preservation district
      “required floor area: 1-story dwelling 860 square feet 2-story dwelling 720 square feet”
    • Specified — Residential uses in A-2 Agricultural Residence district
      “required floor area: 1-story dwelling 860 square feet 2-story dwelling 720 square feet”
    • Specified — Residential uses in R-1 Single-Family Residential district
      “required floor area: 1-story dwelling 860 square feet 2-story dwelling 720 square feet”
    • Specified — Residential uses in RC Residential Conservation Development district
      “required ground floor area: 1-story dwelling 1,200 square feet 2-story dwelling 1,000 square feet”
    • Specified — Residential uses in RC-2 Residential Clustering district
      “required floor area: 1-story dwelling 800 square feet 2-story dwelling 720 square feet more stories 720 square feet plus 400 square feet for each additional unit over the first 2 units”
  • Minimum lot sizeSpecified

    Residential uses in the A-1 Agricultural Preservation Area District.

    • Residential uses on lots under five acres require 2 acres.
    • Residential uses on lots of five acres or more require 5 acres.
    • Section 3.2.3.B.2 contains an exception for certain existing residences.
    • Grandfathered-lot provisions may apply.
    • Adequate sewage treatment remains required.

    minimum lot size, less than five acres: 2 acres (A-1 residential use) · minimum lot size, five acres or more: 5 acres (A-1 residential use)

    “Residential uses, less than five acres: Lot size 2 acres [...] Residential uses, five acres or more: Lot size 5 acres”
    9 more reviewed findings on this topic
  • SetbacksSpecified

    Setback lines under the Boone County Zoning Ordinance for unincorporated Boone County.

    • The source does not provide the numeric setback distances on the page opened.
    • Deck applicants are directed to contact the zoning inspector for property setback requirements.
    “The Zoning Ordinance dividing Boone County into districts, regulating and restricting the location and use of buildings, structures and land for trade, industry, residence and other uses within these districts; regulating and restricting the intensity of such uses, and establishing setback lines in order to promote the orderly development of unincorporated portion of Boone County in accordance with the Official Comprehensive Plan and Illinois Complied Statutes.”
  • Living in an RVLimited

    Recreational vehicles not designed for permanent residency parked on lots in residential and agricultural districts.

    • The vehicle must be kept behind the building line or in a permitted accessory structure.
    • Front-yard parking is limited to no more than 48 hours.
    • Front-yard parking is only for maintenance, packing, or unpacking.
    • The cited rule applies to recreational vehicles as defined in section 1.2.3.

    maximum front-yard parking period: <= 48 hours (Only for maintenance, packing, or unpacking)

    “Recreational vehicles (as defined in section 1.2.3 ) not designed for permanent residency, may be parked on lots in residential and agricultural districts provided they are kept behind the building line or in permitted accessory structures. Such vehicles may be parked in front yards for a period of time not to exceed 48 hours only for the purpose of maintenance, packing or unpacking of the vehicles.”
  • Who permits septicMixed (with conditions)

    Private sewage disposal in Boone County.

    • The Boone County Health Department administers county permitting and inspection.
    • Installations must comply with both IDPH and Boone County Health Department private sewage disposal codes.
    “The system must be installed in accordance with all IDPH and Boone County Health Department private sewage disposal codes. Boone County Health Department must be notified 48 hours prior to beginning septic system installation.”
    One more reviewed finding on this topic
    • County (with conditions) — Private sewage disposal permitting and inspection administered by the Boone County Health Department
      “The system must be installed in accordance with all IDPH and Boone County Health Department private sewage disposal codes. Boone County Health Department must be notified 48 hours prior to beginning septic system installation.”
  • Septic permitRequired

    New septic systems, septic field replacements, and septic alterations in Boone County.

    • Soil bores are required for new installation or replacement of a septic field after system failure.
    • A septic plan must be drawn to scale and include proposed home/building locations.
    • Applicable variances must be requested in writing before approval.
    • The septic plan and permit must be approved before installation and before a Boone County building permit is issued.
    • ATU systems using reduced field size require an Operator’s Permit and signed agreement before septic permit issuance.

    plan review time: 5-10 business days (after receiving septic plan)

    “The septic plan and well application must be approved and permits issued before installation or drilling may begin or before a Boone County Building Permit will be issued.”
  • Septic inspectionRequired

    Private sewage disposal systems installed or repaired in Boone County.

    • The Health Department must receive 48 hours’ notice before installation.
    • No portion of the system may be covered or concealed until inspected and approved by the health officer.
    • An unscheduled inspection fee may apply for inspections requested sooner than 48 hours.
    • Homeowners installing their own systems must pay for two additional mandatory compliance inspections.
    “No portion of any private sewage disposal system shall be covered or concealed until after it has been inspected and approved by the health officer.”
    One more reviewed finding on this topic
    • Required — Private sewage disposal systems in Boone County
      “No portion of any private sewage disposal system shall be covered or concealed until after it has been inspected and approved by the health officer. A call the day before or early on the day of completion is required for a final inspection appointment.”
  • Well permitRequired

    Construction, sealing, deepening, or modification of water wells in Boone County.

    • A to-scale site plan is required for new, modified, and replacement wells.
    • Fees are paid at application or plan submittal.
    • The Health Department must be notified 48 hours before work begins.
    • Homeowner well sealings require Health Department inspection.
    “The permit(s) to construct, seal, deepen, or modify a water well must be obtained from Boone County Health Department prior to commencement of work. Once the permit has been issued, Boone County Health Department must be notified 48 hours prior to commencement of work.”
    One more reviewed finding on this topic
    • Required — Well drilling associated with Boone County construction and septic permitting
      “If the permit applications are approved, the septic and well permits are issued to the property owner and copies are sent to the contractors. The septic plan and well application must be approved and permits issued before installation or drilling may begin or before a Boone County Building Permit will be issued.”
  • Subdividing landLimited

    Properties located within subdivisions in unincorporated Boone County.

    • The county states that subdivision properties may have additional approvals or permits.
    • The page directs applicants to check with their association for additional requirements.
    “If your property is located within a subdivision, there may be additional approvals/permits required. Please check with your association for more information.”
  • Permit feesPublished (with conditions)

    Published county fees associated with zoning verification letters and lots of record, and published septic permit application-fee timing.

    • The zoning page states a $50.00 fee per zoning verification letter and a $75.00 fee per lot of record.
    • The private sewage page states that permit application fees are paid at the time of plan submittal but does not state the fee amount.
    • The opened sources do not establish a complete building-permit fee schedule.

    zoning verification letter fee: 50 USD per letter · lot of record fee: 75 USD per lot · septic permit application fee payment timing: at time of plan submittal

    “Please note there is a $50.00 fee per zoning verification letter and a $75.00 fee per lot of record.”
    One more reviewed finding on this topic
    • Published (with conditions) — Published Boone County zoning verification and lot-of-record fees
      “Please note there is a $50.00 fee per zoning verification letter and a $75.00 fee per lot of record.”
  • Permit processPublished (with conditions)

    County building-permit submission and review process for unincorporated Boone County.

    • Permits must be submitted through the county’s online system.
    • The applicant is notified after review whether the submission complied.
    • Missing information can delay processing.
    • A building permit is released after review approval and payment.
    • Most structures require Health Department site-plan approval before permit release.
    • Subdivision properties may require additional approvals or permits.
    “All permits must be submitted using our online system, which is accessible by using the link below . Once the review is completed, the applicant will be notified whether it complied. Please note that any missing information can result in the delay of your processing. A building permit will be released once the review is approved and payment has been received.”
    One more reviewed finding on this topic
    • Published (with conditions) — Boone County building permit application process
      “All permits must be submitted using our online system, which is accessible by using the link below . Once the review is completed, the applicant will be notified whether it complied. Please note that any missing information can result in the delay of your processing. A building permit will be released once the review is approved and payment has been received.”

Illinois rules that apply here

  • 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.”
  • 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.”
  • 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.”
  • Mandatory utility hookupWater and sewer (with conditions)

    Each building in Illinois intended for human habitation or occupancy, where the Illinois Plumbing Code applies to its plumbing-system design or installation.

    • Water may be supplied by a public water system, semi-private water system, or private water supply constructed under 77 Ill. Adm. Code 920 or 930.
    • Sewage may be connected to a public sewer system or a private sewage disposal system constructed under 77 Ill. Adm. Code 905.
    • All installations must also comply with applicable State and local laws, ordinances, rules, regulations, and local codes.
    • Individually owned residences sharing a common wall or ownership right with ground-floor access, such as townhouses or rowhouses, are separate buildings and require separate connections; a condominium-association residence may instead use one public-water service line to a centralized manifold or meter room with independent shutoff valves, a main shutoff valve at the property line, and compliance with local water-department or water-authority requirements.
    • A private water supply may be interconnected with a public water system only when it is located and constructed under 77 Ill. Adm. Code 920 and 925 and the public system is protected against backflow and back siphonage under Section 890.1130; no physical connection is permitted between a potable-water system and a non-potable-water source.
    “Each building [...] shall have a connection to a public water system, [...] and a connection to a public sewer system or private sewage disposal system”
  • Agricultural exemptionAvailable

    Agricultural experiences conducted as a secondary use with agricultural production on a farm in Illinois.

    • The activity must be agriculture-related, a secondary use in conjunction with agricultural production, and occur on a farm.
    • The activity must be open to the public with the intended purpose of promoting or educating the public about agriculture, agricultural practices, agricultural activities, or agricultural products.
    • The property’s primary use must be agricultural production.
    • The exemption prevents a county from requiring a conditional use permit, special use permit, special exception, or variance; the statute does not state that other applicable State or local requirements are waived.
    “a county shall not require a conditional use permit [...] or variance for agricultural experiences on property of which the primary use is agricultural production.”
  • 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.”
  • 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.”
  • Campground & park staysLimited

    Operation of a campground providing temporary parking of recreational vehicles in Illinois; this is not a determination of long-term RV occupancy on an individual private parcel outside the statutory campground definition.

    • IDPH annually inspects and licenses covered campgrounds.
    • A covered campground includes an area where three or more tents, cabins, recreational vehicles, or other shelters are erected and maintained for camping, or where space is provided for camping or temporary RV parking for 10 or more persons for six or more camping days in a calendar year.
    • Campgrounds within home-rule units of government are exempt from this State program.
    • IDPH inspects water supply and sewage disposal systems, electrical systems, sanitation, food service, and recreational facilities.
    • IDPH reviews construction plans for new campgrounds and major expansions or alterations.
    • Local zoning and other local requirements may separately apply.

    recreational vehicles or other shelters erected and maintained for camping: >= 3 shelters (One alternative branch of the statutory campground definition.) · persons using space for camping or temporary RV parking: >= 10 persons (Applies for six or more camping days during a calendar year.) · camping days: >= 6 days per calendar year (Applies to the 10-or-more-person branch of the statutory campground definition.)

    “State law requires the IDPH to annually inspect and license campgrounds in Illinois. The Campground Licensing and Recreational Area Act defines campground as a recreational area where three or more tents, cabins, recreational vehicles or other permanent or non-permanent type shelters are erected and maintained for camping or where space is provided for camping, temporary parking of recreational vehicles or placing of such tents, cabins, recreational vehicles or other permanent or non-permanent type shelters of any kind for 10 or more persons for six or more camping days during a calendar year.”
    2 more reviewed findings on this topic
    • Allowed (with conditions) — Overnight camping in Illinois campgrounds subject to the Campground Licensing and Recreational Area Act.
      ““Camping Day” means any 24 hour period or portion thereof during which the participants remain overnight at the site.”
    • Limited — Temporary camping in covered Illinois campgrounds; this claim does not establish whether camping is allowed on a private parcel outside the statutory campground definition.
      “Campgrounds within home rule units of government are exempt. Staff inspects the water supply and sewage disposal systems, the electrical systems, general sanitation, food service and recreational facilities. IDPH also reviews construction plans for all new campgrounds and for major expansions or alterations of existing ones.”
  • 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).”

Still unanswered

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

  • Lot coverage — Lot coverage limits in unincorporated Boone County.
  • Camping on your land — Temporary camping on private land in unincorporated Boone County.
  • Tiny homes — Tiny-home occupancy in unincorporated Boone County.
  • Accessory dwellings — Accessory dwelling units in unincorporated Boone County.

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 Boone County, Illinois

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

Boone County scores 23/100 on the Bolthole Index, a weak county profile. Its strengths: a durable current and mid-century hazard profile. Watch-outs: about 450,376 people within a 30-minute drive and workable self-sufficiency basics (37.4″/yr rainfall).

How much does land cost in Boone County, Illinois?

Land in Boone County runs about $9,226 per acre, based on the latest county data.

What is the water situation in Boone County?

Boone County gets about 37.4" of rain a year, with severe drought in roughly 6.3% of years.

How remote is Boone County?

A representative private-land location has about 450,376 people within a 30-minute drive and 13,339,076 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 Boone compares in Illinois

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