Bolthole Index

LaSalle County, Illinois

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

47Index Score / 100
#79 of 102 in Illinois

Unincorporated LaSalle County, Illinois requires building permits for commercial projects and residential structures over 200 square feet or with any side at least 20 feet long1. The Land Use Department handles county building permits and zoning outside incorporated municipalities; the Health Department handles private septic installation and repair permits234.

At a glance

Building permit
Required for commercial projects and residential structures over 200 sq ft or with any side at least 20 ft; limited exemptions apply1
Zoning
Yes in unincorporated areas; lot area, setbacks and building height depend on the zoning district356
RV occupancy
Up to 180 days per calendar year, but not on specified developed or platted parcels unless the ordinance otherwise permits7
Septic
$230 application fee, onsite survey and permit for installation or repair, plus final inspection before backfilling89
Floodplain work
All construction in an unincorporated-county floodplain requires a county permit; other approvals may also apply10
Owner-builder exemption
No general self-build exemption confirmed; qualifying farm structures and necessary farm residences have a conditional agricultural code exemption11
Building inspection
Final inspection after permitted work is complete and before occupancy; currently handled by remote video1213
Manufactured home
In R-2, a doublewide on a permanent foundation is permitted at 1,000 sq ft or more and under 10 years old; below 1,000 sq ft or over 10 years requires special-use approval14

Who to call

Planning & zoning

LaSalle County Land Use Department

Zoning, subdivision, construction-permit, floodplain, mobile-home and vacant-property ordinances for unincorporated LaSalle County

815-434-8666

landuse@lasallecounty.org

119 West Madison Street, Room 107, Ottawa, IL 61350

Health department

LaSalle County Health Department - Sewage Disposal Program

Permitting and inspection of individual (private) sewage disposal systems in unincorporated LaSalle County

Health department

LaSalle County Health Department

Parent department for LaSalle County's Environmental Health Division and its septic, water-well and nuisance-control programs

815-433-3366

717 E Etna Road, Ottawa, IL 61350

Health department

LaSalle County Health Department - Environmental Health Division

Food sanitation, private sewage disposal, water well program, nuisance control and other environmental health programs for LaSalle County

environmentalhealth@lasallecountyil.gov

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

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

Yes. Unincorporated LaSalle County requires a written building permit before a new building or structure is erected and a construction permit before rebuilding, structural alteration, an addition, relocation or a significant change of use2. For residential work covered by the ordinance’s exemptions, routine maintenance or repair, utility-service connections, structures no larger than 200 square feet with every side under 20 feet, and mobile homes placed on pads in licensed mobile-home parks are exempt, but those exemptions do not cover additions, structural alterations or significant changes of use involving a single-family dwelling, habitable residential space or accessory structure2. The county applies the 2024 International Residential Code to covered non-agricultural homes and accessory structures and the 2023 National Electrical Code to covered construction15. Qualifying agricultural structures and necessary farm residences have a narrower exemption discussed below, not a blanket owner-builder exemption11. Municipal building permits come from Ottawa16, Mendota17, Marseilles18, Earlville19, Village of Grand Ridge20. Private septic permits remain with the LaSalle County Health Department in unincorporated areas4.

Who issues building permits in unincorporated LaSalle County?

The LaSalle County Land Use Department administers building permits and the county's zoning, subdivision, floodplain, mobile-home and vacant-property ordinances in unincorporated LaSalle County213. Reach the department at 815-434-8666 (fax 815-433-9303) or landuse@lasallecounty.org, at 119 West Madison Street, Room 107, Ottawa, IL 6135013. A building-permit application must include the county permit and zoning application, a dimensioned site drawing, a property description and any applicable water-supply and sewage-disposal information; a separate Health Department permit must be issued first when a water or sewage system will be installed2. The county gives written approval or denial within 30 days after submittal, and a denied applicant has 45 business days to correct deficiencies and resubmit without another fee2. Building-permit charges otherwise vary by project and plan review21. SAFEbuilt schedules remote-video inspections at 847-510-4104 or ilinspections@safebuilt.com13.

Does LaSalle County have zoning?

LaSalle County zoning applies in unincorporated areas3. Municipal zoning is administered by Ottawa22, Streator23, Peru24, Mendota25, Marseilles26, Oglesby27, Village of Seneca28, Earlville29, Village of North Utica30, Village of Leland31, Village of Grand Ridge32. Private septic permits remain with the LaSalle County Health Department in unincorporated areas4. The online ordinance and maps are references, but the print ordinance and later County Board amendments control if they differ33. Minimum lot area depends on district and utilities: an A-1 detached home generally needs 35 acres, an RR detached home generally needs 1 acre, and an R-2 detached home needs 10,000 square feet with public sewer and water but 1 acre with a private sanitary or water system; exceptions and planned-unit provisions can change the result5. Setbacks also vary: most districts use 70 feet from a township-road centerline, 85 feet from a county-road centerline and 100 feet from a state-road centerline; an R-2 detached home has 10-foot side and rear yards34. Building-height limits are district-specific; in R-3, detached and two-family homes, mobile-home parks and certain attached homes may not exceed 36 feet6. In R-2, a mobile or manufactured doublewide on a permanent foundation is a permitted use when it has at least 1,000 square feet and is under 10 years old; a home below 1,000 square feet or more than 10 years old requires special-use approval after a public hearing14. The R-2 manufactured-home rule does not establish a minimum floor area for conventional homes or other districts; ask Land Use to classify a proposed tiny home and clarify the treatment of a manufactured home exactly 10 years old14.

How do septic permits work in LaSalle County?

The LaSalle County Health Department's Environmental Health program administers private sewage disposal systems in unincorporated LaSalle County4. Installation or repair of an individual private sewage system requires a permit; before the construction permit is issued, submit the completed application and $230 fee and allow department personnel to conduct an onsite survey8. Notify the Health Department for the final inspection before backfilling, and protect the designated disposal area from traffic, compaction and changes in soil during construction9. State rules also require plan approval before work begins and at least 48 hours' notice before construction35. Only about 3.2% of LaSalle County soils are rated free of severe limitations for a conventional drain field, so establish septic feasibility early36. Reach the Health Department at 815-433-3366, 717 E Etna Road, Ottawa, IL 61350, or email environmentalhealth@lasallecountyil.gov3738. Inside Ottawa, a private sewage system needs the city plumbing inspector’s permit39. Marseilles requires a written private sewage permit signed by the Commissioner of Public Property, and LaSalle requires its authorized agent’s written private wastewater permit where public sewer is unavailable4041. The LaSalle County Health Department handles private septic permits in the LaSalle County portion of Streator, North Utica and Leland424344.

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

In unincorporated LaSalle County, an RV may be used for living or sleeping for no more than 180 days in a calendar year7. RV living or sleeping is not allowed for any period when the vehicle is in a subdivision, an unincorporated platted town or on a parcel with an existing residence, unless another part of the ordinance permits it7. We could not confirm a general temporary-camping rule or a separate tiny-home occupancy category for unincorporated LaSalle County; ask Land Use how the proposed use and design would be classified.

What are the steps to build a home in unincorporated LaSalle County?

  1. Confirm the parcel's zoning district, minimum lot area, setbacks and height limit with Land Use before design5346.
  2. Establish the water supply and sewage plan; when either system will be installed, obtain the separate Health Department permit before the county building permit can issue2.
  3. Prepare the county permit and zoning application, a dimensioned site drawing, a property description and the applicable water and sewage information2.
  4. Apply before erecting a new structure or before rebuilding, structurally altering, adding to, relocating or significantly changing the use of one2.
  5. If claiming the agricultural-use exemption, submit the notarized operator affidavit, prior-year proof of at least $5,000 in gross agricultural income and the $25 compliance-permit fee; the exemption covers Building Code provisions and related code fees, not the compliance application11.
  6. Post the issued permit in plain view, begin within 9 months and finish within 2 years2.
  7. Obtain any floodplain or state-highway driveway approval, arrange septic inspection before backfilling and complete the building inspection before occupancy1045912.

What should you check before buying land in LaSalle County?

A new, modified or sealed water well needs a permit from Illinois or an approved local health department before work begins46. All construction in an unincorporated LaSalle County floodplain requires a county permit10. A driveway onto a state-maintained road needs an IDOT permit before work starts45. Before a land split, ask Land Use whether each proposed lot complies with the zoning district and subdivision rules47. We could not confirm the county-road driveway requirement or mandatory public-water and sewer connection rules; ask Land Use about road-jurisdiction approval and Environmental Health about the proposed water and sewage arrangements.

Watch-outs

  • LaSalle County outsources building inspections to SAFEbuilt and currently runs them as remote video inspections, not in-person visits, so don't expect an inspector to walk the site under the current process13.
  • Only about 3.2% of LaSalle County soils are rated free of severe limitations for a conventional septic drain field; an individual site's suitability needs evaluation36.
  • Every construction project in an unincorporated LaSalle County floodplain needs a county permit, and the project may also need local, state or federal approvals10.

Sources

  1. Land Use Department, quoted and re-checked
  2. LaSalle County Building Permit Ordinance, quoted and re-checked
  3. Land Use Department, quoted and re-checked
  4. Sewage Disposal, quoted and re-checked
  5. LaSalle County Zoning Ordinance 2026 Revision 23, quoted and re-checked
  6. LaSalle County Zoning Ordinance 2026 Revision 23, quoted and re-checked
  7. LaSalle County Zoning Ordinance 2026 Revision 23, quoted and re-checked
  8. Sewage Disposal, quoted and re-checked
  9. Private Sewage Disposal Permit Application, quoted and re-checked
  10. Floodplain, quoted and re-checked
  11. LaSalle County Building Permit Ordinance, quoted and re-checked
  12. Building Permit Ordinance 2025 Final, quoted and re-checked
  13. LaSalle County Land Use Department (lasallecountyil.gov)
  14. LaSalle County Zoning Ordinance 2026 Revision 23, quoted and re-checked
  15. LaSalle County Building Permit Ordinance, quoted and re-checked
  16. Ottawa: Chapter 90, Sec. 90-19: Building permit (LaSalle County), quoted and re-checked
  17. Mendota: Chapter 129, Article I: Scope; Applicability; Administration (LaSalle County), quoted and re-checked
  18. Marseilles: § 150.01 Building permits; issuance; inspection of sewerage system (LaSalle County), quoted and re-checked
  19. Earlville: Earlville Code of Ordinances, Sec. 8-89—Amendments to the ICC International Residential Code, 2021 edition (LaSalle County), quoted and re-checked
  20. Village of Grand Ridge: § 155.250 Building Permit (LaSalle County), quoted and re-checked
  21. Building Permit Ord 2025 Final, quoted and re-checked
  22. Ottawa: Chapter 118, Sec. 118-4: A residence districts (LaSalle County), quoted and re-checked
  23. Streator: Streator Municipal Code § 17.32.040—Permissible uses and specific exclusions (LaSalle County), quoted and re-checked
  24. Peru: City of Peru Zoning Ordinance (LaSalle County), quoted and re-checked
  25. Mendota: City of Mendota, IL Code of Ordinances (LaSalle County), quoted and re-checked
  26. Marseilles: § 153.01 Adoption of regulations by reference (LaSalle County), quoted and re-checked
  27. Oglesby: Zoning & Incentives | City of Oglesby, IL (LaSalle County), quoted and re-checked
  28. Village of Seneca: Seneca, Illinois Code of Ordinances (LaSalle County), quoted and re-checked
  29. Earlville: Earlville Code of Ordinances, Sec. 44-132—R-1 dimensional standards (LaSalle County), quoted and re-checked
  30. Village of North Utica: North Utica, IL Laws (LaSalle County), quoted and re-checked
  31. Village of Leland: Leland, Illinois Code of Ordinances (LaSalle County), quoted and re-checked
  32. Village of Grand Ridge: Chapter 155: Zoning (LaSalle County), quoted and re-checked
  33. Zoning, quoted and re-checked
  34. LaSalle County Zoning Ordinance 2026 Revision 23, quoted and re-checked
  35. 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
  36. 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
  37. LaSalle County Health Department (lasallecountyil.gov)
  38. LaSalle County Health Department - Environmental Health Division (lasallecountyil.gov)
  39. Ottawa: official source (LaSalle County), quoted and re-checked
  40. Marseilles: § 51.021 Written permit to be obtained; application (LaSalle County), quoted and re-checked
  41. LaSalle: § 51.03 Private Wastewater Disposal (LaSalle County), quoted and re-checked
  42. Streator: LaSalle County Sewage Disposal (LaSalle County), quoted and re-checked
  43. Village of North Utica: Construction Building Permit Application (LaSalle County), quoted and re-checked
  44. Village of Leland: LaSalle County Health Department Private Sewage Disposal Permit Application (LaSalle County), quoted and re-checked
  45. Highway Permits (Illinois statewide rule), quoted and re-checked
  46. 77 Ill. Admin. Code 920.130, Water Well Permit Requirements (Illinois statewide rule), quoted and re-checked
  47. Land Use Department | LaSalle County, IL, quoted and re-checked

Written October 12, 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, LaSalle County has countywide zoning.

RuleLaSalle CountyPutnam CountyGrundy CountyMarshall CountyLivingston CountyKendall CountyWoodford County
Building permitRequiredRequiredRequiredRequiredLimitedRequiredLimited
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Health Dept.BureauCounty Health Dept.BureauCounty Health Dept.County Health Dept.County Health Dept.

County locator

LaSalle County in Illinois

47
County map
LaSalle County highlighted among the Illinois counties · colored by Index score

How LaSalle County scores

Seclusion30100% ev.
Self-Sufficiency39100% ev.
Admin Boringness4390% ev.
Durability64100% ev.
Property Autonomy42100% ev.
Carry Cost54100% 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 →

$195kTypical home
2.2%Property tax
$10,136Land / acre
37.1"Annual rain
2.3% of yrsSevere drought
5.7 / yr (+5.5)Mid-century 100°F days
14 daysMid-century dry spell
1.69" (+4.5%)Mid-century 1-day rain
1.77×Wildfire change factor
100%Forward climate coverage
$1,536Home insurance / yr
3.2% / yrInsurance growth
0.78%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
50,114People within 30 min
9,800,594People within 2 hr
52,695Radius comparison (15 mi)
95.4People / sq mi
0.4%Federal land
96.6%Land at 15% slope or less
3.2%Soils rated "not limited" for septic (strict USDA rating)
23,006 acWorkable land screen
10.5%Wooded land
56.9 tonsBiomass / forest ac
50.3°FAvg temp

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Cities and towns in LaSalle 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 researched: Adams Township · Allen Township · Brookfield Township · Bruce Township · Village of Cedar Point · Village of Dana · Dayton Township · Deer Park Township · Dimmick Township · Eagle Township · Earl Township · Eden Township · Fall River Township · Farm Ridge Township · Freedom Township · Grand Rapids Township · Groveland Township · Hope Township · Village of Kangley · LaSalle Township · Village of Leonore · Village of Lostant · Manlius Township · Mendota Township · Meriden Township · Miller Township · Village of Millington · Mission Township · Village of Naplate · Northville Township · Ophir Township · Osage Township · Ottawa Township · Otter Creek Township · Peru Township · Village of Ransom · Richland Township · Rutland Township · Village of Rutland · Serena Township · Village of Sheridan · South Ottawa Township · Village of Tonica · Troy Grove Township · Village of Troy Grove · Utica Township · Vermillion Township · Wallace Township · Waltham Township

Answers from the rulebook for LaSalle County

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

LaSalle County rules

  • Building permitRequired

    Commercial projects; residential structures over 200 square feet or with any side 20 feet or longer; specified remodeling and listed improvements.

    • Permit exemptions include routine maintenance or repair, utility service connections, structures not exceeding 200 square feet, structures with every side less than 20 feet, and mobile homes placed on pads in licensed mobile-home parks.
    • The exemptions do not apply to additions, structural alterations, or significant changes of use to single-family dwellings, residential habitable spaces, or accessory structures.
    • Construction must commence within 9 months of permit issuance and be completed within 2 years.

    area threshold: > 200 square feet (Structures at or below 200 square feet are exempt under Section 4.2) · side-length threshold: >= 20 feet (Structures with every side less than 20 feet are exempt under Section 4.2)

    “without first obtaining a written building permit”
  • Owner-builder exemptionConditional

    An owner/operator's bona fide agricultural buildings, accessory structures, structures, and necessary residences on farms in unincorporated LaSalle County.

    • The property must be outside the limits of cities, villages, and incorporated towns; the ordinance applies to those outside areas and excludes bona fide agricultural buildings and farm residences from Article 5 Building Code provisions.
    • The use must be bona fide agricultural use, including the listed agricultural activities and necessary structures, including residences, to carry on the agriculture operation.
    • The bona fide agricultural use must produce gross income of $5,000.00 or more to the operator.
    • Proof of income from the preceding calendar year is required.
    • A $25.00 fee is required per building permit application to determine compliance with the ordinances and statutes identified in Section 4.3; the agricultural exemption is from Article 5 Building Code provisions and related Building Code fees, not from the compliance permit application.
    • The operator must sign an affidavit under oath that the use qualifies; the county application additionally requires the agricultural affidavit to be signed and notarized and states that the structures may be inspected at any time.
    • The exemption is agricultural-use based and is not stated as a general owner-builder or self-construction exemption.

    permit application fee: 25 USD per building permit application (Required for agricultural compliance review under Section 6.1.) · minimum gross agricultural income: >= 5000 USD (Proof from the preceding calendar year is required.)

    “Building, accessory structures and structures that are used for bona fide agricultural uses are exempt from the Building Code provisions of Article 5 and related Building Code fees. If the buildings(s), accessory structure(s) or structure(s) is/are exempt as a bona fide agricultural use, a permit will be required pursuant to Section 6.1 at a $25.00 fee per building permit application to determine compliance with the ordinances and statues set forth in Section 4.3.”
  • Building code adoptedAdopted

    Non-agricultural construction outside the limits of cities, villages, and incorporated towns in LaSalle County.

    • The 2024 International Residential Code applies to non-agricultural detached one- and two-family dwellings and qualifying townhouses and accessory structures.
    • The 2024 International Building, Fire, Mechanical, and Fuel Gas Codes apply to specified non-agricultural commercial, industrial, storage, business, institutional-public, and multi-family residential buildings and structures.
    • The National Electrical Code, NEC 2023 edition, is adopted for the specified covered construction.
    • Agricultural buildings and structures are excluded from Article 5 Building Code provisions, subject to the ordinance's agricultural-use requirements and permit/compliance provisions.
    • The County ordinances page states the update is effective January 1, 2025.

    International Residential Code edition: 2024 edition (Amended by Article 5; applies to specified non-agricultural detached one- and two-family dwellings, qualifying townhouses, and accessory structures.) · International Building Code edition: 2024 edition (Applies to specified non-agricultural commercial, industrial, storage, business, institutional-public, and multi-family residential construction.) · International Fire Code edition: 2024 edition (Applies to specified non-agricultural commercial, industrial, storage, business, institutional-public, and multi-family residential construction.) · International Mechanical Code edition: 2024 edition (Applies to specified non-agricultural commercial, industrial, storage, business, institutional-public, and multi-family residential construction.) · International Fuel Gas Code edition: 2024 edition (Applies to specified non-agricultural commercial, industrial, storage, business, institutional-public, and multi-family residential construction.) · National Electrical Code edition: 2023 edition (Applies as stated in the ordinance.)

    “These regulations shall apply to all buildings, accessory structures and structures constructed outside the limits of cities, villages and incorporated towns”
  • InspectionsRequired

    Permitted construction subject to County building-code inspection.

    • Final inspection occurs after permitted work is complete and before occupancy.
    • The permit holder or agent must notify the Building Officer and provide access and means for inspection.
    • Current inspections are conducted through a remote video inspection process according to the Land Use Department page.
    “Final inspection shall be made after the permitted work is complete and prior to occupancy. It shall be the duty of the permit holder or their agent to notify the Building Officer that such work is ready for inspection.”
  • County-wide zoningPresent (with conditions)

    County zoning in unincorporated LaSalle County.

    • The Land Use Department serves the unincorporated areas of LaSalle County.
    • The online ordinance is for reference; the print ordinance and later County Board amendments control if discrepancies exist.
    “for the unincorporated areas of LaSalle County.”
  • Local zoningPresent (with conditions)

    County zoning regulation in unincorporated LaSalle County.

    • The Land Use Department states that its zoning ordinances regulate unincorporated areas of LaSalle County.
    • The county zoning ordinance divides the unincorporated area into A-1, AC, R-1, R-2, R-3, B-1, B-2, and I-1 districts.
    • Municipal boundaries and any separate municipal regulations are outside this county claim.
    “In order to carry out the purpose and intent of this Ordinance, the unincorporated area of the County is hereby divided into the following districts:”
  • Zoning districtsPublished (with conditions)

    County zoning districts and maps for unincorporated LaSalle County.

    • The County publishes a zoning ordinance and zoning maps for reference.
    • The County warns that the online versions may not reflect the most current ordinance or maps; the print version and subsequent County Board amendments control.
    “The print version of the Zoning Ordinance and Maps [...] remains the official version”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Mobile or manufactured doublewide homes with permanent foundations in LaSalle County's unincorporated R-2 Single Family Residence District.

    • The permitted-use rule requires a permanent foundation.
    • The dwelling must be 1,000 square feet or greater.
    • The dwelling must be less than 10 years old.
    • The ordinance separately lists mobile or manufactured homes with permanent foundations that are less than 1,000 square feet and/or greater than 10 years old as Special Uses requiring prior approval after a public hearing under Section 14.10.
    • This claim does not establish a general minimum floor area for conventional single-family dwellings or for other zoning districts.

    minimum dwelling area: >= 1000 square feet (Mobile or manufactured doublewide homes with permanent foundations in the R-2 district; smaller homes are listed as Special Uses.) · maximum dwelling age: < 10 years (Homes greater than 10 years old are listed as Special Uses.)

    “Sec.8.2-3 Permitted Uses The following uses are permitted: [...] E. Mobile or Manufactured (doublewide) Home with a permanent foundation, 1000 square feet or greater, and less than 10 years old. [...] Sec. 8.2-4 Special Uses The following Special Uses require prior approval after public hearing in accordance with the requirements of Sec. 14.10. [...] G. MOBILE HOMES or MANUFACTURED HOMES with a permanent foundation. If less than 1000 square feet in size and/or greater than 10 years old.”
  • Minimum lot sizeDistrict specific (with conditions)

    Residential and other permitted or special uses in the county zoning districts governing unincorporated LaSalle County.

    • The cited requirements are district-specific and subject to exceptions and Planned Unit Development provisions.
    • R-2 minimums depend on whether public sanitary sewer and water or private sanitary or water systems serve the property.
    • R-3 requires public sanitary sewer and public water supply for all uses.
    • The zoning ordinance's print version and subsequent County Board amendments control if they differ from the online reference version.

    A-1 single-family detached dwelling minimum lot area: >= 35 acres (Except as otherwise provided in the ordinance.) · RR single-family detached dwelling minimum lot area: >= 1 acre (Planned Unit Developments have no minimum lot area.) · R-2 single-family detached dwelling minimum lot area with public sanitary sewer and water: >= 10000 square feet (For private sanitary or private water systems, minimum is 1 acre.) · R-3 single-family detached dwelling minimum lot area: >= 10000 square feet (Planned Unit Developments have no minimum lot area.)

    “Single Family Detached Dwellings: The zoning lot shall be not less than thirty-five (35) acres.”
  • SetbacksDistrict specific (with conditions)

    Principal buildings in unincorporated county zoning districts, including R-2.

    • For R-2 single-family detached dwellings, side and rear yards are each 10 feet.
    • Front setbacks are measured from the roadway centerline and vary by roadway classification: township, county, or state roadway.
    • The setback must also be at least 30 feet from the edge of the road right-of-way or roadway easement.
    • Other yard requirements are measured from the respective property line.

    township-road front setback: 70 feet from roadway centerline · county-road front setback: 85 feet from roadway centerline · state-road front setback: 100 feet from roadway centerline · R-2 side yard: 10 feet · R-2 rear yard: 10 feet

    “Building setbacks in most zoning districts are 70 feet from Township Road centerline, 85 feet from County Road centerline, 100 feet from State/Federal Route centerline, and 10 feet from side/rear yards.”
  • Building heightSpecified

    Building-height requirements in County zoning districts; specifically identified here for R-3 General Residence District.

    • The ordinance states height is prescribed in each zoning district.
    • In R-3, single-family detached dwellings, two-family dwellings, mobile-home parks, and certain single-family attached dwellings may not exceed 36 feet.

    R-3 maximum height: <= 36 feet (listed R-3 uses)

    “Not to exceed thirty-six (36) feet in height.”
  • Living in an RVLimited

    Living or sleeping in a recreational vehicle under the County zoning ordinance.

    • A recreational vehicle may be used for living or sleeping for no more than 180 days in a calendar year.
    • It may not be used for living or sleeping for any period when located in a subdivision, unincorporated platted town, or parcel with an existing residence, unless otherwise permitted by the ordinance.

    maximum occupancy period: <= 180 days per calendar year (unless otherwise permitted by the ordinance)

    “not exceeding 180 days in a calendar year.”
  • Who permits septicCounty (with conditions)

    Private sewage disposal systems administered through the LaSalle County Health Department Environmental Health program.

    • The program applies to installations and repairs of individual sewage disposal systems.
    • The source identifies an Environmental Health Practitioner as the inspecting official.
    “inspected by an Environmental Health Practitioner.”
  • Septic permitRequired

    Installation or repair of individual private sewage disposal systems.

    • A completed application, fee, and onsite survey by department personnel are required before a construction permit is issued.
    • The application states a $230 fee; if denied, the fee is returned.

    application fee: 230 USD (returned if permit is denied)

    “A permit for construction will not be issued”
  • Septic inspectionRequired

    Private sewage disposal system construction in LaSalle County.

    • The Health Department must be notified for a final inspection before backfilling.
    • The inspection addresses whether the system and/or well meets current Illinois Department of Public Health standards.
    • The designated sewage-disposal area must be protected before and during construction from traffic, soil compaction, and soil removal or addition.
    • A completed application, fee, and onsite survey are required before a construction permit is issued.

    permit fee: 230 USD (If a permit is denied, the fee shall be returned to the applicant.)

    “The Health Department must be notified for a final inspection sewage disposal system construction before backfilling.”
  • Subdividing landRegulated (with conditions)

    Subdivision, property splits, and creation of lots in unincorporated LaSalle County.

    • The county directs applicants to verify compliance with the LaSalle County Subdivision Ordinance, LaSalle County Zoning Ordinance, and Illinois Plat Act before subdividing property.
    • New lots created by subdivision or deed division must comply with the applicable zoning district's lot-size requirements.
    • This claim does not determine whether a particular split qualifies for an exemption or variance.
    “Please contact our department prior to subdividing property in order to verify that the split will comply with the LaSalle County Subdivision, LaSalle County Zoning Ordinance, and the Illinois Plat Act.”
  • Building in a floodplainRequired

    Construction and development in unincorporated LaSalle County floodplains.

    • Additional permits may be required from local entities and State and Federal agencies.
    • The County Department enforces the County Floodplain Ordinance and oversees compliance for construction and development in County floodplains.
    “All construction occurring in the floodplain requires a permit”
  • Permit feesPublished (with conditions)

    County building, agricultural compliance, septic, and subdivision permit fees.

    • Building permit fees vary by project type, square footage, inspections, and plan review; the building inspector calculates the price after plan review.
    • Agricultural compliance applications are $25 per application.
    • Private sewage disposal permits are $230; if denied, the fee is returned.
    • Environmental health fees page states its schedule was approved effective January 1, 2018.
    • Subdivision fees are $200 plus $25 per lot for fewer than 50 lots, or $200 plus $50 per lot for 50 or more lots.
    • All building-permit fees in the cited ordinance are nonrefundable; the septic permit application specifically states the fee is returned if the permit is denied.

    agricultural compliance application: 25 USD per application · private sewage disposal permit: 230 USD (Returned if permit is denied.) · subdivision fee for fewer than 50 lots: $200 plus $25 per lot USD · subdivision fee for 50 or more lots: $200 plus $50 per lot USD

    “For nonagricultural detached one and two family dwellings (townhouses) not more than three stories in height and/or their accessory structures the following fees shall be charged: [...] New construction/ additions/ alterations $0.22 per square foot for all areas, but not less than $130.00 minimum.”
  • Permit processPublished (with conditions)

    Building permits and related construction permits for buildings, accessory structures, and structures constructed outside the limits of cities, villages, and incorporated towns in LaSalle County.

    • A written building permit is required before erecting a new building, accessory structure, structure, or part thereof.
    • A written construction permit is required before rebuilding, structurally altering, adding to, relocating, or significantly changing the use of a building, accessory structure, structure, or part thereof.
    • For one- and two-family dwellings and multiple single-family dwellings, no building permit is required for routine maintenance or repair, utility service connections, buildings or structures that do not exceed 200 square feet and have every side less than 20 feet, or placement of mobile homes on pads in licensed mobile home parks.
    • The listed exemptions do not apply to additions, structural alterations, or significant changes of use to single-family dwellings, residential habitable spaces, or accessory structures.
    • Applications must include the county permit and zoning application, a dimensioned site drawing, a premises description, and, if applicable, water-supply and sewage-disposal facilities; a separate Health Department permit is required before issuance of the building permit when a water-supply or sewage-disposal system will be installed.
    • All building permit applications are to be reviewed promptly, with written notice of approval or denial within 30 days of submittal; after denial, the applicant has 45 business days to resolve deficiencies and resubmit without additional fees.
    • A permit must be posted in plain view until completion of construction or occupancy; construction must commence within 9 months of issuance and be completed within 2 years.
    • The county Land Use Department is responsible for administration and enforcement of the ordinance.
    • The county webpage states that effective January 1, 2025, building codes were updated to the 2024 International Residential, Building, Fire, Mechanical, and Fuel Gas Codes and the 2023 National Electrical Code, with listed amendments.

    residential structure permit threshold: > 200 square feet (No permit is required for a structure that does not exceed 200 square feet, subject to the other exemption conditions.) · side-length permit threshold: >= 20 feet (No permit is required only when the lineal length of every side is less than 20 feet.) · application review notice: 30 days (Written approval or denial notice after submittal.) · resubmission period after denial: 45 business days (Deficiencies may be resolved and the complete application resubmitted without additional fees.) · construction commencement deadline: 9 months (Measured from permit issuance.) · construction completion deadline: 2 years (Measured from permit issuance.)

    “To erect a new building, accessory structure or structure or part thereof without first obtaining a written building permit from the LaSalle County Building Officer.”

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.”
  • 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.”
  • 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.”
  • Campground & park staysAllowed (with conditions)

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

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

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

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

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

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

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

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

Still unanswered

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

  • Camping on your land — Temporary camping on private land in unincorporated LaSalle County.
  • Tiny homes — Tiny-home occupancy in unincorporated LaSalle County.
  • Mandatory utility hookup — Required connection to public water or sewer utilities.

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 LaSalle County, Illinois

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

LaSalle County scores 47/100 on the Bolthole Index, a solid county profile. Its strengths: mixed durability signals. Watch-outs: about 50,114 people within a 30-minute drive and workable self-sufficiency basics (37.1″/yr rainfall).

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

LaSalle County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by LaSalle County Health Department, Environmental Health Division (Private Sewage Disposal Program, under Illinois DPH). 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.

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

Living in an RV on your own land in LaSalle County is limited to specific cases: Living or sleeping in a recreational vehicle under the County zoning ordinance. A recreational vehicle may be used for living or sleeping for no more than 180 days in a calendar year. It may not be used for living or sleeping for any period when located in a subdivision, unincorporated platted town, or parcel with an existing residence, unless otherwise permitted by the ordinance. Confirm with the county before relying on it.

How much does land cost in LaSalle County, Illinois?

Land in LaSalle County runs about $10,136 per acre, based on the latest county data.

What is the water situation in LaSalle County?

LaSalle County gets about 37.1" of rain a year, with severe drought in roughly 2.3% of years.

How remote is LaSalle County?

A representative private-land location has about 50,114 people within a 30-minute drive and 9,800,594 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 LaSalle compares in Illinois

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