Bolthole Index

Will County, Illinois

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

32Index Score / 100
#98 of 102 in Illinois

Unincorporated Will County, Illinois requires a building permit before you build a home, barn or shed outside its cities, villages and incorporated towns1. The county also has its own zoning ordinance, administered by the Land Use Department's Current Planning & Zoning section, so your build has to fit the zoning district's rules for setbacks, height and use before a permit is approved23. Septic runs on a separate track: the Will County Health Department's Private Sewage Program issues the construction permit and inspects the installation4.

At a glance

Building permit
Required outside cities, villages and incorporated towns, from the Land Use Department's Building Division1
Zoning
Yes — the Will County Zoning Ordinance regulates unincorporated land5
Septic permit
Required from the Will County Health Department's Private Sewage Program4
Setbacks & building height
Set by zoning district, not one countywide number — confirm with Current Planning & Zoning36
Manufactured & tiny homes
Manufactured homes have statewide installation rules, but parcel-specific zoning for manufactured and tiny homes is unconfirmed72
Private wells
A permit is required before a new well, modification or sealing; ask the Health Department about local processing89
Floodplain review
A county floodplain submittal is required when any part of a hydrologic disturbance is in a floodplain10

Who to call

Building permits

Will County Land Use Department — Building Division

Building permit applications, plan review and construction inspections for unincorporated Will County

815-727-8634

[email protected]

58 East Clinton Street, Suite 100, Joliet, IL 60432

Zoning

Will County Land Use Department — Current Planning & Zoning

Zoning applications, map amendments, special use permits, variances, and zoning-compliance review of building permit applications for unincorporated Will County

815.740.8140

[email protected]

58 E. Clinton Street, Suite 100, Joliet, IL 60432

Septic permits

Will County Health Department — Private Sewage Program (Joliet Main Office)

Private sewage disposal (septic) system construction permits and inspections for Will County; also handles private well permits

815-727-8490

501 Ella Avenue, Joliet, IL 60433

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 Will County, Illinois?

Yes. Will County requires a building permit before construction on a home, barn or shed outside its cities, villages and incorporated towns — in other words, in unincorporated Will County1. Illinois does not issue building permits for privately funded construction; the applicable local government handles any permit requirement11. Will County has adopted building codes, and the Building Section administers them for county-regulated projects12. The county's application process also includes construction inspections13. Because Will County regulates zoning in unincorporated areas, the project must also satisfy the parcel's zoning requirements5.

Who handles building and zoning permits in Will County?

The Will County Land Use Department's Building Division reviews building permits at 58 East Clinton Street, Suite 100, Joliet, IL 60432; call 815-727-8634 or email [email protected]14. Current Planning & Zoning is at 58 E. Clinton Street, Suite 100, Joliet, IL 60432; call 815.740.8140 or email [email protected]15. Every building permit application is reviewed for compliance with the zoning ordinance15. Through the county's SmartGov process, applicants can apply, submit documents, schedule inspections, pay fees, print permits and view permit details online16. The Will County Health Department handles private septic permits and inspections separately417.

Does Will County have zoning?

Yes. The Will County Zoning Ordinance regulates unincorporated Will County, while municipal zoning may apply inside incorporated municipalities5. Setback distances are established by the applicable zoning district or local ordinance rather than by one statewide number3. Building-height limits likewise depend on the district and use6. Current Planning & Zoning reviews every building permit application for zoning compliance15. We could not confirm county rules for RV residence, tiny-home occupancy, minimum dwelling size, minimum lot size or lot coverage, so ask Current Planning & Zoning about the specific parcel and proposed use before buying or designing2.

How do septic permits work in Will County, Illinois?

Get plan approval from the Will County Health Department's Private Sewage Program before construction starts on a new private sewage disposal system418. Illinois requires notice to the health department or IDPH at least 48 hours before system work begins, and an absorption-field change of 25% or more is treated as a new system18. Will County's program inspects new and repaired septic systems17. Only 0.2% of Will County soils avoid severe limitations for a conventional drain field, even though 98.2% of county land has a slope of 15% or less; plan on a parcel-specific evaluation rather than assuming a standard field will work1920.

Can you live in an RV, tiny home or manufactured home on your land in Will County?

A manufactured home is allowed statewide as a dwelling in Illinois, and a manufactured home community of 5 or more sites needs an IDPH license unless it sits in a home rule unit of government7. That state rule covers occupancy generally, but it does not override Will County's own zoning: because Will County has an active zoning ordinance, whether a specific parcel's district allows a manufactured home, tiny home or RV as a residence still comes down to Current Planning & Zoning215. Illinois' campground-licensing law only addresses licensed campgrounds and recreational-vehicle parks, not whether you can live in an RV on your own unincorporated land, so it does not answer this question either way21. Before you move an RV, tiny home or manufactured home onto Will County land long-term, confirm the parcel's zoning district and any building-permit trigger with Current Planning & Zoning and the Building Division1514.

How do you build a home in Will County, Illinois?

  1. Confirm that the parcel is in unincorporated Will County, because incorporated municipalities have separate jurisdiction1.
  2. Ask Current Planning & Zoning for the parcel's district and the applicable use, setback and height rules536.
  3. Obtain septic plan approval from the Will County Health Department before septic construction starts418.
  4. Apply online, submit documents and pay fees through the Land Use Department's permit process16.
  5. Obtain an IDOT permit before constructing access to a state highway22.
  6. Submit floodplain materials if any part of the proposed hydrologic disturbance lies in a floodplain10.
  7. Schedule the required building and septic inspections as work proceeds1317.

What should you check before buying land in Will County, Illinois?

Order a septic site evaluation before closing because only 0.2% of Will County soils avoid severe limitations for a conventional drain field19. Check the whole work area against floodplain mapping: a floodplain submittal is required when any part of a proposed hydrologic disturbance lies in a floodplain10. Confirm whether access is from a county road or state highway, because IDOT requires a permit before work on a state-highway driveway begins22. Will County's effective property-tax rate is about 2.3%, and the median annual property-tax bill is about $6,9932324. The county has about 700,728 residents at roughly 838.3 people per square mile, and the nearest city of 100,000 or more is about 14 miles from the county center252627.

Watch-outs

  • Whether Will County has an owner-builder exemption from its permit process is unconfirmed; ask the Building Division directly before you plan to act as your own contractor28.
  • This research did not confirm a specific Will County office for county-road driveway permits (as opposed to state-highway access permits); ask the Building Division or Will County Division of Transportation which applies to your road22.
  • Only 0.2% of Will County's soils avoid severe septic limitations, so do not assume a conventional drain field will work on any given parcel — get the Health Department's site evaluation before you rely on one19.

Sources

  1. Chapter 150 Will County Building Code (2026 county census)
  2. Will County Code § 155-1.40 Applicability and Jurisdiction (2026 county census)
  3. 55 ILCS 5/5-12001 — Authority to regulate and restrict location and use of structures (Illinois statewide rule), quoted and re-checked
  4. Will County Health Department - Wells and Septic Systems (2026 county census)
  5. Will County Code § 155-1.40 Applicability and Jurisdiction, quoted and re-checked
  6. 55 ILCS 5/5-12001 — Authority to regulate and restrict location and use of structures (Illinois statewide rule), quoted and re-checked
  7. Manufactured & Modular Homes/Mobile Structures (Illinois statewide rule), quoted and re-checked
  8. 77 Ill. Admin. Code 920.130, Water Well Permit Requirements (Illinois statewide rule), quoted and re-checked
  9. Will County Health Department — Private Sewage Program (Joliet Main Office) (willcountyhealth.org)
  10. Stormwater Technical Guidance Manual, quoted and re-checked
  11. Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
  12. Will County Land Use Department Building, quoted and re-checked
  13. Chapter 150 Will County Building Code, quoted and re-checked
  14. Will County Land Use Department — Building Division (willcounty.gov)
  15. Will County Land Use Department — Current Planning & Zoning (willcounty.gov)
  16. Development Services Division, quoted and re-checked
  17. Private Well and Septic Program, quoted and re-checked
  18. 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
  19. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  20. Share of land at 15% slope or less: Bolthole Index county data
  21. Youth Camps and Campgrounds (Illinois statewide rule), quoted and re-checked
  22. Highway Permits (Illinois statewide rule), quoted and re-checked
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data
  25. County population: Bolthole Index county data
  26. Population density: Bolthole Index county data
  27. Distance to the nearest metro area: Bolthole Index county data
  28. Will County Building Ordinance, Chapter 150 (2026 county census)

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

Will County in Illinois

32
County map
Will County highlighted among the Illinois counties · colored by Index score

How Will County scores

Seclusion10100% ev.
Self-Sufficiency53100% ev.
Admin Boringness4390% ev.
Durability66100% ev.
Property Autonomy42100% ev.
Carry Cost46100% 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 →

$379kTypical home
2.3%Property tax
$10,259Land / acre
39.2"Annual rain
0.6% of yrsSevere drought
4.5 / yr (+4.3)Mid-century 100°F days
13.5 daysMid-century dry spell
1.85" (+7.7%)Mid-century 1-day rain
1.73×Wildfire change factor
100%Forward climate coverage
$1,649Home insurance / yr
3% / yrInsurance growth
1.12%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
292,054People within 30 min
11,448,398People within 2 hr
543,031Radius comparison (15 mi)
838.3People / sq mi
3.4%Federal land
98.2%Land at 15% slope or less
0.2%Septic soil without severe limits
1,289 acWorkable land screen
29.8%Wooded land
40 tonsBiomass / forest ac
50.6°FAvg temp

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Answers from the rulebook for Will County

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

Will County rules

  • Building permitRequired

    Regulated building work in unincorporated Will County.

    • A written permit is issued only after proposed work conforms to the Building Ordinance and other pertinent laws.
    • A completed approved list of registered contractors is required before permit issuance.
    • Permits expire one year after issuance unless renewed or extended.
    • Demolition permits lapse after 60 days if not completed.
    “A permit must be obtained in advance and all other requirements of the Building Ordinance must be complied with whenever a building or parts of appurtenance thereof [...] located outside the limits of cities, villages and incorporated towns of this county and regulated by the Ordinance, is erected, installed, altered, converted, remodeled, re-roofed, structurally repaired, moved or changed, except as provided hereafter:”
  • Owner-builder exemptionConditional

    Qualified farmers performing work on their own agricultural and personal-use structures on personally owned property.

    • Farmer must demonstrate ability to perform the work to the Building Division's satisfaction.
    • Applies to personally owned remote parcels.
    • Plumbing or electrical work requires a permit.
    “Qualified farmers who can demonstrate their ability to perform such work, to the satisfaction of the Building Division, may work on his/her own agricultural and personal use structures located upon their personally owned property. This shall apply to any personally owned remote parcels”
  • Building code adoptedAdopted

    Building construction regulated by the Will County Building Division under the current Will County Building Ordinance.

    • The Building Section administers and enforces codes adopted by the Will County Board.
    • Other state and local approvals may apply.
    “The regulations and standards contained in the previously published books or pamphlets referred to in this Ordinance are hereby adopted by reference and made a part of this Building Ordinance.”
  • InspectionsRequired

    Construction inspections for regulated buildings in unincorporated Will County.

    • Required inspections include foundation, rough building, plumbing, electrical, mechanical, insulation, final, and other applicable inspections.
    • Work may not proceed beyond an inspection stage without written approval.
    • Final inspections must occur after completion and before occupancy.
    • Agriculturally exempt buildings are inspected for code compliance without fee.
    • Applicable health, highway, and fire-district approvals may also be required.
    “Progression of Inspections---work shall not be done on any part of the building or structure beyond the point indicated in each successive inspection without first obtaining the written approval of the Building Official.”
  • County-wide zoningPresent (with conditions)

    All development, public or private, within unincorporated Will County.

    • Areas within incorporated cities, villages, and towns that have zoning ordinances in effect are excluded.
    • Areas within incorporated cities and towns without zoning ordinances are subject to the county ordinance.
    • State or federal law and express ordinance exceptions may apply.
    • The ordinance states an effective date of 10-1-2012.
    “The regulations of this zoning ordinance apply to all development, public or private, within unincorporated Will County, except as provided by state or federal law or otherwise expressly stated in this zoning ordinance.”
  • Local zoningVaries (with conditions)

    County aggregate of zoning jurisdiction in incorporated and unincorporated areas.

    • Incorporated cities, villages, and towns that have zoning ordinances are excluded from the county zoning ordinance.
    • Incorporated cities and towns without zoning ordinances are subject to the county ordinance.
    “Areas within the incorporated limits of cities, villages, and towns that have zoning ordinances in effect are excluded from the jurisdiction of this zoning ordinance. Areas within the incorporated limits of cities and towns that do not have zoning ordinances in effect are subject to the provisions of this zoning ordinance.”
  • SetbacksSpecified

    Buildings and uses in Will County agricultural and residential zoning districts.

    • Agricultural A-1/A-2 street setbacks are 100 feet, side setbacks are 50/20 feet, and rear setbacks are 50/50 feet.
    • Residential district setbacks vary by district and use.
    • Exceptions and measurement rules are in § 155-18.10.

    A-1 street setback: 100 feet from centerline of road · A-2 street setback: 100 feet from centerline of road · A-1 side setback: 50 feet · A-2 side setback: 20 feet · A-1 rear setback: 50 feet · A-2 rear setback: 50 feet

    “Minimum Setbacks (feet) | | S1 | Street (from CL of road) | 100 | 100 S2 | Side | 50 | 20 S3 | Rear | 50 | 50”
  • Lot coverageSpecified

    Principal and accessory uses in Will County agricultural districts.

    • A-1 and A-2 agricultural districts have maximum building coverage of 20 percent.
    • Other district-specific regulations and exceptions may apply.

    maximum building coverage: 20 percent (A-1 and A-2 agricultural districts)

    “B1 | Maximum Building Coverage (%) | 20 | 20”
  • Septic inspectionRequired

    New and repaired wells and septic systems in Will County.

    • The official program guide describes inspections on all new and repaired wells and septic systems.
    “inspections on all new and repaired wells and septic systems”
  • Agricultural exemptionConditional

    Agricultural structures and qualified farmers under the Will County Building Ordinance.

    • Plumbing or electrical work requires a permit.
    • Qualified farmer must demonstrate ability to the Building Division's satisfaction for work on personally owned agricultural and personal-use structures.
    “Agricultural exempt permits are no fee permits unless electrical or plumbing is installed as part of the permit. See agricultural exemptions in the Will County Zoning Ordinance (155-1.50). Any plumbing or electrical will require a permit and shall meet all codes for these installations.”
  • Building in a floodplainRequired

    Hydrologic disturbance proposed within a floodplain in unincorporated Will County, including development where only part of the disturbance lies in the floodplain.

    • A floodplain submittal is required whenever a hydrologic disturbance is proposed within a floodplain.
    • The submittal is required if any part of the hydrologic disturbance will be in the floodplain, even if the majority of the development lies outside the floodplain.
    • All floodplain modifications must be the minimum required to accomplish the development.
    • For new base flood and floodway determinations, the applicant must provide the IDNR-OWR permit and FEMA approval when IDNR-OWR permitting authority applies.
    • The Administrator decides whether stormwater-permit review may begin before written receipt of IDNR-OWR and FEMA approval when permits are required.
    • Hydraulic disturbance of the base flood and floodway may not occur until all necessary permits are issued and received by the Administrator.
    • A special use permit for floodplain development and IDNR sign-off are required when applicable.
    “A floodplain submittal is required whenever a hydrologic disturbance is proposed within a floodplain. The submittal is required if any part of the hydrologic disturbance will be in the floodplain, even if the majority of the development lies outside the floodplain.”
  • Permit processPublished (with conditions)

    Will County Land Use Department permit processing through the SmartGov portal.

    • Applicants apply online, submit documents, schedule inspections, pay fees, print permits, and view permit information.
    “contractors and applicants apply for permits, submit documents, schedule inspections, pay fees, print their permit, and view detailed information regarding their permits.”

Illinois rules that apply here

  • 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”
  • Who permits septicMixed

    Installation and plan approval for private sewage disposal systems statewide in Illinois.

    • IDPH regulates private sewage disposal systems within the described scope.
    • About 90 local health agencies also review construction plans under local ordinances or as agents of IDPH.

    surface discharge threshold: <= 1500 gallons per day (Systems with no surface discharge are also regulated.)

    “There are about 90 local health agencies in Illinois that also review sewage disposal system construction plans”
  • Septic permitRequired

    Construction of a new private sewage disposal system statewide, including systems where a septic tank is replaced, a major component is added or removed, or the absorption field changes by at least 25 percent.

    • Plan approval must be obtained from IDPH or the applicable local authority before construction begins.
    • Persons constructing, installing, repairing, or modifying the system must notify the Department or local authority at least 48 hours before work begins.
    • The rule requires submission of plans, site and system information, bedroom count or design volume, soil or percolation information, owner information, and applicant signature.

    notice before commencement: >= 48 hours · absorption-field change threshold: >= 25 percent (The rule treats increasing the field by 25% or more, or removing and replacing 25% or more, as a new system.)

    “Plan approval shall be obtained from the Department or local authority prior to beginning any construction of a new private sewage disposal system.”
  • 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.”
  • 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 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.

  • Minimum dwelling size — Dwellings in unincorporated Will County zoning districts.
  • Minimum lot size — Minimum lot-size requirements in unincorporated Will County.
  • Living in an RV — Long-term RV occupancy on private land in unincorporated Will County.
  • Camping on your land — Temporary camping on private land in unincorporated Will County.
  • Tiny homes — Tiny-home occupancy in unincorporated Will County.
3 more unanswered
  • Accessory dwellings
  • Mandatory utility hookup
  • 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.

Water rights & wells in Will County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Illinois’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt — no permit or water right

Reasonable-use rule (Water Use Act of 1983, 525 ILCS 45). New high-capacity wells get 30-day SWCD/ISWS review, but domestic/household wells are below the threshold and exempt (Illinois Water Well Construction Code still applies).

Limit: household wells exempt; only high-capacity points (>=100,000 gpd) notify SWCD/ISWS

Illinois Water Use Act of 1983 (525 ILCS 45) ↗
  • Northeastern Illinois deep bedrock (Cambrian-Ordovician) aquiferpartial of county

    Illinois State Water Survey documents unsustainable drawdown (300-800+ ft) of the deep sandstone aquifer; St. Peter sandstone is partially desaturated in Will, Kane and Kendall and some deep wells are projected to fail by ~2030, steering communities toward Lake Michigan water. The stress affects deep high-capacity municipal/industrial wells; shallow domestic wells are exempt.

    Illinois State Water Survey — NE Illinois water-supply planning ↗

Regulated-riparian state (large uses permitted). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Illinois state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Will County, Illinois

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

Will County scores 32/100 on the Bolthole Index, a marginal county profile. Its strengths: mixed durability signals. Watch-outs: about 292,054 people within a 30-minute drive.

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

Will County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Will County Health Department, Private Sewage Program. 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 Will County, Illinois?

Land in Will County runs about $10,259 per acre, based on the latest county data.

What is the water situation in Will County?

Will County gets about 39.2" of rain a year, with severe drought in roughly 0.6% of years. On water rights, Will County lies in the Northeastern Illinois deep bedrock (Cambrian-Ordovician) aquifer — Illinois State Water Survey documents unsustainable drawdown (300-800+ ft) of the deep sandstone aquifer; St. Peter sandstone is partially desaturated in Will, Kane and Kendall and some deep wells are projected to fail by ~2030, steering communities toward Lake Michigan water. The stress affects deep high-capacity municipal/industrial wells; shallow domestic wells are exempt..

How remote is Will County?

A representative private-land location has about 292,054 people within a 30-minute drive and 11,448,398 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 Will County means bringing your own water and power. The kit we’d start with:

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How Will compares in Illinois

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