Bolthole Index

Cook County, Illinois

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

29Index Score / 100
#100 of 102 in Illinois

Unincorporated Cook County, Illinois requires a permit application for all work except qualifying ordinary repairs, through the Cook County Department of Building and Zoning1. Incorporated municipalities such as Chicago use their own building and zoning authorities2. Cook County also regulates zoning on unincorporated land, and a parked RV on a residential zoning lot cannot be used for living or sleeping34. Private septic systems require Cook County Department of Public Health approval, with four incorporated villages administering their own approved ordinances5.

At a glance

Building permit
Required for work in unincorporated Cook County, except qualifying ordinary repairs1
Zoning
Cook County administers zoning in unincorporated areas; municipalities administer their own rules32
Septic
County health approval is required, except in four incorporated villages with their own approved ordinances56
RV living
A parked RV cannot be used for living or sleeping on an unincorporated residential zoning lot4
Minimum home size
Single-family minimums range from 720 to 1,000 square feet by residential zoning district7
Minimum lot size
Varies by district, dwelling type and sewer or septic service8
Owner-builder
An exemption could not be confirmed; ask the Department of Building and Zoning9
Conventional septic soils
About 0.9% of county soils have no severe limits for a conventional drain field10

Who to call

Building permits

Cook County Department of Building and Zoning

Plan review, building permits, inspections, certificates of occupancy and zoning for unincorporated Cook County and Forest Preserve properties

312-603-0500

[email protected]

69 West Washington Street, Chicago, IL 60602

Online permits →

Building permits

Cook County Building Permit Requirements

Building-permit submission requirements for unincorporated Cook County

[email protected]

Online permits →

Zoning

Cook County Zoning Administrator

Parcel zoning lookup, zoning certificates, variances, special uses and map amendments for unincorporated Cook County

Septic permits

Cook County Department of Public Health - Environmental Health

Review and approval of private sewage disposal systems and well/septic evaluations in Cook County

708-836-8600

7556 Jackson Boulevard, Forest Park, IL 60130

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

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

Yes—unincorporated Cook County requires a permit application for all work other than ordinary repairs covered by the stated code exception1. Cook County's Department of Building and Zoning reviews plans, issues permits and conducts inspections in unincorporated areas and on Forest Preserve properties11. The county has adopted building, residential, mechanical, energy, fire, existing-building, plumbing and electrical codes for that jurisdiction12. A property inside Chicago or another incorporated municipality follows that municipality's building and zoning authority instead of Cook County's process2. Confirm the jurisdiction before applying because the county cannot process permits for property within incorporated municipal boundaries13.

Who issues Cook County building permits, and how do you reach them?

The Cook County Department of Building and Zoning handles building permits for unincorporated Cook County from 69 West Washington Street, Chicago, IL 60602; call 312-603-0500 or email [email protected]11. Permit materials are submitted digitally, and questions about an application can go to [email protected]14. The county offers online applications for listed e-permit types; other types and projects combining listed types must be sent with supporting documents by email13. Electronic submissions require a $100 residential deposit or a $500 non-residential deposit, credited toward the final permit fee1. The minimum e-permit package includes an application, plat of survey, scope of work, contractor letters of intent, deposit and estimated project cost13.

Does Cook County have zoning?

Cook County administers zoning in unincorporated areas, while Chicago and other incorporated municipalities administer their own local rules32. Use the county zoning search and the parcel's property index number to identify the district before designing a house or accessory structure15. Residential districts set different minimum lot areas, dwelling sizes and impervious-surface limits8716. Single-family minimum dwelling sizes range from 720 to 1,000 square feet across the listed residential districts7. Single-family lot requirements range from 5,000 square feet to 5 acres depending on district, dwelling type and sewer or septic service; an R5 parcel using septic needs at least 40,000 square feet8. Property under contract in unincorporated Cook County must obtain a zoning certificate before closing15.

How do septic permits work in Cook County?

Cook County Department of Public Health reviews and approves private sewage disposal systems throughout Cook County, except in incorporated Barrington Hills, Inverness, Palos Park and South Barrington, which use their own state-approved septic ordinances5. Cook County Building and Zoning requires health-department approval before a home-construction project involving a well or septic system can proceed6. The county application calls for a completed application, seven plan sets, a soil report, applicable supporting documents and payment by check or money order5. State rules require plan approval before new private sewage system construction; replacing a septic tank, adding or removing a major component, or changing at least 25% of an absorption field falls within the new-system rule17. Only about 0.9% of Cook County soils lack severe limitations for a conventional drain field, so obtain a site and soil evaluation before relying on a conventional design10.

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

A parked RV cannot be used for living, sleeping or other occupancy on a residential zoning lot in unincorporated Cook County, and it cannot connect to gas, water or sanitary sewer service4. The ordinance allows no more than two parked RVs on such a lot, permits garage storage unless another code provision prohibits it, and does not allow an RV to serve as an accessory structure4. For a tiny home, Cook County's residential zoning summary sets single-family minimum dwelling sizes from 720 to 1,000 square feet depending on district7. The available rules do not establish a separate tiny-home occupancy category, so ask the Zoning Administrator whether the proposed home type and foundation comply in the parcel's district15.

Building a home in unincorporated Cook County: steps in order

  1. Confirm that the parcel is in unincorporated Cook County because incorporated municipalities use their own permitting authorities2.
  2. Find the parcel's zoning district with its property index number, then compare the district's lot area, dwelling size, setbacks and coverage rules with the proposed design1518.
  3. If the site uses a well or septic system, obtain Cook County Department of Public Health approval before the building project moves forward6.
  4. Assemble the application, survey, scope, contractor letters, deposit and estimated cost required for the applicable submission route13.
  5. Submit digitally and pay the $100 residential deposit, which is deducted from the final permit fee1.
  6. Complete required inspections and obtain the applicable certificate of occupancy before using the finished building19.

What should you check before buying land in Cook County?

Start with jurisdiction: Cook County rules govern unincorporated property, while a parcel inside a municipality follows that municipality's building and zoning office2. Check the zoning district, allowed use, minimum lot area, minimum dwelling size and impervious-surface limit before making the offer188716. For unincorporated property under contract, account for the required zoning certificate before closing15. If the parcel lacks sewer service, investigate soils and septic design early because only about 0.9% of county soils have no severe limitations for a conventional drain field10. Also confirm floodplain constraints and access: Illinois requires authorization for regulated floodway work and access work within a state-maintained highway right-of-way2021. Cook County's effective property-tax rate is about 2%, and its median annual property-tax bill is about $6,0532223.

Watch-outs

  • A parked RV cannot be occupied for living or sleeping on an unincorporated Cook County residential zoning lot, even though limited RV parking is allowed4.
  • Cook County has not confirmed an owner-builder exemption; ask the Department of Building and Zoning before assuming you qualify for one911.
  • Only about 0.9% of Cook County soils have no severe limits for a conventional septic drain field, so budget for site evaluation and a design suited to the parcel10.

Sources

  1. Building and Zoning Building Permits, quoted and re-checked
  2. Building and Zoning, quoted and re-checked
  3. Zoning Ordinance Administration, quoted and re-checked
  4. 25-0036 Full Text PDF, quoted and re-checked
  5. Septic, quoted and re-checked
  6. Septic, quoted and re-checked
  7. Zoning Districts Requirements, quoted and re-checked
  8. Zoning Districts Requirements, quoted and re-checked
  9. (2026 county census)
  10. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  11. Cook County Department of Building and Zoning (cookcountyil.gov)
  12. Department of Building and Zoning Code Posting, quoted and re-checked
  13. Building and Zoning Building Permits, quoted and re-checked
  14. Cook County Building Permit Requirements (cookcountyil.gov)
  15. Cook County Zoning Administrator (cookcountyil.gov)
  16. Zoning Districts Requirements, quoted and re-checked
  17. 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
  18. Zoning Ordinance Administration, quoted and re-checked
  19. Building and Zoning, quoted and re-checked
  20. Permit Program (Illinois statewide rule), quoted and re-checked
  21. Highway Permits (Illinois statewide rule), quoted and re-checked
  22. Effective property tax rate: Bolthole Index county data
  23. Median property tax bill: Bolthole Index county data

Written September 27, 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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County locator

Cook County in Illinois

29
County map
Cook County highlighted among the Illinois counties · colored by Index score

How Cook County scores

Seclusion9100% ev.
Self-Sufficiency5199% ev.
Admin Boringness4390% ev.
Durability70100% ev.
Property Autonomy42100% ev.
Carry Cost27100% 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 →

$343kTypical home
2%Property tax
$18,054Land / acre
38.3"Annual rain
1% of yrsSevere drought
3.9 / yr (+3.7)Mid-century 100°F days
13.7 daysMid-century dry spell
1.97" (+7.7%)Mid-century 1-day rain
1.7×Wildfire change factor
100%Forward climate coverage
$1,643Home insurance / yr
2.6% / yrInsurance growth
0.88%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
2,538,522People within 30 min
12,877,700People within 2 hr
2,610,439Radius comparison (15 mi)
5,383.6People / sq mi
0%Federal land
98.6%Land at 15% slope or less
0.9%Septic soil without severe limits
3,344 acWorkable land screen
44.9 tonsBiomass / forest ac
50.2°FAvg temp

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Answers from the rulebook for Cook County

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

Cook County rules

  • Building permitRequired

    All work in unincorporated Cook County.

    • Ordinary repairs subject to Section 102-105.3 of the Cook County Building Code are excepted.
    • New construction served by a septic field requires Cook County Department of Public Health approval at submission.
    • Applicants must submit the required application documents and Child Support Enforcement Declaration Form.

    residential electronic-submission deposit: 100 USD (Deposit is deducted from final permit fee) · non-residential electronic-submission deposit: 500 USD (Deposit is deducted from final permit fee)

    “All work in unincorporated Cook County, other than ordinary repairs subject to provisions of Section 102-105.3 of the Cook County Building Code, Amendments-Adopting Ordinance, requires the submittal of a permit application.”
  • Building code adoptedPartial

    Building, residential, mechanical, energy, fire, existing-building, plumbing, and electrical codes in unincorporated Cook County and Forest Preserve District properties.

    • The July 29, 2021 ordinance adopted local amendments.
    • The 2018 International Energy Conservation Code includes Illinois Amendments.
    • The 2014 State of Illinois Plumbing Code and 2014 Cook County Electrical Code remain in their entirety.
    • Except as provided in Section 102-1(c) of the Cook County Code of Ordinances, submitted drawings must conform after December 1, 2021.

    adoption date: 2021-07-29 · conformity date: >= 2021-12-01 (Except as provided in Section 102-1(c) of the Cook County Code of Ordinances)

    “On July 29, 2021 the Cook County Board of Commissioners approved an ordinance adopting the following regulatory codes with local amendments for all of unincorporated Cook County and all of the Cook County Forest Preserve District properties –”
  • Certificate of occupancyLimited

    Certificates of occupancy for applicable buildings and business occupancy processes in unincorporated Cook County.

    • The Department issues certificates of occupancy in its jurisdiction.
    • The official business occupancy flowchart shows rough and final inspections, permit and inspection fees, and certificate issuance for applicable new or changed business occupancy.
    “Apply for a Cook County Building Permit Contact Inspectors for rough & final inspections Pay Inspection Fee Pay Permit Fee Certificate of Occupancy Issued”
  • County-wide zoningPresent

    Zoning administration in unincorporated Cook County.

    • Incorporated municipalities have their own applicable local building and zoning authorities.
    “The Department oversees all building and zoning matters in the unincorporated areas of Cook County and all of the Forest Preserves of Cook County.”
  • Local zoningVaries

    County aggregate of zoning administration across unincorporated Cook County and incorporated municipalities.

    • Cook County administers zoning in unincorporated areas; incorporated municipalities administer their own zoning and building matters.
    • This is an aggregate countywide conclusion and does not mean Cook County administers each municipal ordinance.
    “Inquiries regarding permits, zoning certificates and other matters for properties located in incorporated jurisdictions (municipalities) should contact the applicable local building and zoning authority.”
  • Zoning districtsPublished

    Cook County zoning districts and district-specific residential, commercial, industrial, public, and Forest Preserve requirements in unincorporated Cook County.

    • The official summary contains district-specific requirements and directs users to the text of Article II for parking requirements.
    • Exact requirements vary by district and use.
    “You can search for Zoning of the property in Unincorporated Areas of Cook County. The Zoning District Requirements are listed to help you in planning your projects.”
  • Minimum dwelling sizeSpecified

    Residential zoning districts R1 through R8 in unincorporated Cook County.

    • Requirements vary by zoning district and residence type.

    single-family minimum size: 720-1000 square feet (R1 through R8 values shown in the official summary) · two-family minimum size: 600 square feet (Applicable districts only) · multi-family minimum size: 500 square feet (Applicable districts only)

    “Minimum Size: 7 Single‐Family Unit 1,000 SF 1,000 SF 1,000 SF 900 SF 720 SF 720 SF 720 SF 720 SF 720 SF Two‐Family Unit ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 600 SF 600 SF 600 SF 600 SF Multi‐Family Unit ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 500 SF 500 SF 500 SF 500 SF”
  • Minimum lot sizeSpecified

    Residential zoning districts R1 through R8 in unincorporated Cook County.

    • Requirements vary by zoning district, dwelling type, sewer service, and septic service.
    • R5 properties on septic service require at least 40,000 square feet.

    single-family minimum lot area: 5000-5 square feet/acres (District-specific values range from 5 acres and 2 acres to 5,000-40,000 square feet; the source table must be consulted for the exact district.)

    “Minimum Lot Area Per Dwelling Unit Single‐Family 5 Acres 2 Acres 40,000 SF 20,000 SF Sewer 40,000 SF Septic 10,000 SF 1 5,000 SF 10,000 SF 10,000 SF 10,000 SF [...] R5 Properties on septic service shall require at least 40,000 square feet of lot area.”
  • Lot coverageSpecified

    Residential and commercial zoning districts in unincorporated Cook County.

    • Maximum impervious surface varies by residential district; commercial maximum lot coverage also varies by district.

    residential maximum impervious surface: 20-50 percent (R1 through R5A values shown; R6 through R8 show no value in the summary) · commercial maximum lot coverage: 30-40 percent (Only districts with stated maximums in the commercial summary)

    “Maximum Impervious Surface 20% 20% 25% 35% 50% 50% ‐‐ ‐‐ ‐‐ [...] Maximum Lot Coverage: NONE NONE NONE NONE 40% NONE 30% NONE”
  • Living in an RVProhibited

    Living, sleeping, or other occupancy use of a parked RV on a residential zoning lot in unincorporated Cook County.

    • The prohibition applies to a parked RV.
    • No RV may be connected to gas, water, or sanitary sewer service.
    • The ordinance separately limits parking to no more than two RVs on a residential zoning lot.
    • An RV may be parked in a fully enclosed garage unless parking is specifically prohibited elsewhere in the Code.
    • RVs may not be used as accessory structures in any zoning district.
    • The source ordinance was approved by the Cook County Board of Commissioners; its text states that it takes effect immediately upon adoption.

    maximum RVs parked on residential zoning lot: <= 2 RVs

    “At no time shall a parked RV be used for living, sleeping or other purposes. No RV shall be connected to gas, water or sanitary sewer service.”
  • Who permits septicCounty (with conditions)

    Private sewage disposal systems throughout Cook County.

    • CCDPH reviews and approves systems throughout Cook County except incorporated Barrington Hills, Inverness, Palos Park, and South Barrington, which have their own IDPH-approved septic ordinances.
    • Applications require a completed application, seven sets of plans, a soil report, applicable documents, and payment by check or money order.
    “CCDPH reviews and approves all private sewage disposal systems throughout Cook County; except in incorporated Barrington Hills, Inverness, Palos Park, and South Barrington, which have their own IDPH-approved septic ordinances.”
  • Septic permitRequired

    Private sewage disposal system approval for homes and businesses without sewer service.

    • CCDPH approval is required before moving forward with applicable construction projects involving septic systems.
    • Incorporated Barrington Hills, Inverness, Palos Park, and South Barrington use their own IDPH-approved septic ordinances.
    “Cook County Building and Zoning requires homeowners and contractors to get CCDPH approval before moving forward with home construction projects involving wells and septic.”
  • Permit feesPublished (with conditions)

    Cook County building permit submissions and selected environmental-health permits.

    • Electronic building submissions require a $100 residential or $500 non-residential deposit, deducted from the final permit fee.
    • Environmental-health fees vary by service and include plan review, modification, repair, alternative-system design, and percolation-test fees.

    residential building deposit: 100 USD (Electronic submissions) · non-residential building deposit: 500 USD (Electronic submissions) · septic design plan review under 1500 GPD: 225 USD · septic design plan review over 1500 GPD: 300 USD · septic addition/modification plan review: 150 USD

    “Design Plan Review, Less Than 1500 Gal/Day (GPD) | 225.00 Design Plan Review, Greater Than 1500 GPD | 300.00 Design Plan Review, Addition/Modification, Septic System | 150.00”
  • Permit processPublished (with conditions)

    Cook County building permits and listed e-permits in unincorporated Cook County.

    • Applicants may apply online, by email, or in person/mail.
    • Minimum e-permit requirements include a permit application, plat of survey, scope of work, contractor letters of intent, $100 deposit, and estimated cost.
    • If the permit type is not listed or the scope includes multiple listed types, applicants must send the application and supporting documents by email.
    • Permits cannot be processed for Chicago or incorporated suburban municipal boundaries.
    “The Cook County Department of Building and Zoning offers e-permits for residents and businesses located in unincorporated Cook County.”

Illinois rules that apply here

  • 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.”
  • 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”
  • Septic inspectionLimited

    New and replacement surface-discharging private sewage disposal systems covered by Illinois EPA general NPDES Permit ILG62.

    • Coverage under the general permit is limited to eligible dischargers.
    • Systems not eligible for general-permit coverage may require an individual NPDES permit.
    • Periodic inspection, monitoring, and reporting are required under the permit.
    “The permit sets discharge limits and requires periodic inspection, monitoring and reporting.”
  • 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.”
  • Well permitRequired

    Construction of a new water well, modification of an existing water well, or sealing of an abandoned water well in Illinois.

    • A permit must be obtained from the Illinois Department of Public Health or an approved local health department before work begins.
    • The application must use Department or approved local health department forms and include a plan and drawing of the proposed construction.
    • The plan must include the lot size, slope, property lines, distances to septic tanks, abandoned wells, property lines, seepage fields, sewers, and other contamination sources; driller license number and name; estimated daily pumping capacity if greater than 100,000 gallons per day; well location; owner name and address; well type; estimated depth; well-use type; and proposed aquifer.
    • The permit is void if construction has not commenced within one year after issuance.
    • The permit fee for constructing, deepening, modifying, or sealing a water well may not exceed $100.
    • The Department will deny a permit request when available information indicates groundwater contamination exceeds Class I groundwater standards, subject to the treatment approval provision in subsection (f)(2).
    • The permittee must notify the Department, approved local health department, or approved unit of local government by telephone or in writing at least two days before work begins.

    maximum water well permit fee: <= 100 USD · permit commencement deadline: 1 year after issuance (Permit is void if construction has not commenced within that period.) · pre-work notification: >= 2 days (Notification may be by telephone or in writing.)

    “A permit to construct a new water well, modify an existing water well or seal an abandoned water well shall be obtained from the Department or approved local health department prior to start of work.”
  • 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 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 authorityGeneral

    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 a building code.
    • A county that does not adopt a building code is treated as a non-building-code jurisdiction, and section 10.09-1 of the Capital Development Board Act applies.
    • A county that adopts a building code must comply with section 10.18 of the Capital Development Board Act.
    • Locally adopted codes must regulate residential structural design at least as stringently as the baseline International Residential Code.
    • For privately funded projects, the local code official is the authority having jurisdiction; the State does not issue private-project building permits, perform plan reviews, or perform inspections.
    “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.

  • Owner-builder exemption — Owner-builder exemption from Cook County building requirements.
  • Camping on your land — Temporary camping on private land.
  • Tiny homes — Tiny-home occupancy in unincorporated Cook County.
  • Accessory dwellings — Accessory dwelling occupancy in unincorporated Cook County.
  • Mandatory utility hookup — Water and sewer connection requirements for property development.
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 Cook County, Illinois

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

Cook County scores 29/100 on the Bolthole Index, a weak county profile. Its strengths: mixed durability signals. Watch-outs: little seclusion — roughly 2,538,522 people within a 30-minute drive and higher long-term carry cost.

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

Cook County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Cook County Department of Public Health (Environmental Health). 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.

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

Living in an RV on your own land in Cook County is prohibited: Living, sleeping, or other occupancy use of a parked RV on a residential zoning lot in unincorporated Cook County. The prohibition applies to a parked RV. No RV may be connected to gas, water, or sanitary sewer service. Confirm with the county before relying on it.

How much does land cost in Cook County, Illinois?

Land in Cook County runs about $18,054 per acre, based on the latest county data.

What is the water situation in Cook County?

Cook County gets about 38.3" of rain a year, with severe drought in roughly 1% of years.

How remote is Cook County?

A representative private-land location has about 2,538,522 people within a 30-minute drive and 12,877,700 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.

Off-grid gear

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

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How Cook compares in Illinois

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