Bolthole Index

LaSalle County, Illinois

Building permits, zoning and septic rules in Oglesby, Illinois

Oglesby, Illinois requires city building permits for new homes and many property improvements; work cannot begin until the building permit is issued.1 Oglesby sets its own zoning inside city limits in LaSalle County, while private septic installations and repairs require approval through the LaSalle County Health Department.234

At a glance

Building permits
City building permit required for new homes and listed improvements1
Zoning
City residential and agricultural districts apply inside Oglesby5
Septic permits
LaSalle County Health Department; application fee $23043
Owner plumbing work
Resident owners have a limited licensed-plumber exception, not a building-permit exemption6
Agricultural coverage
A agricultural district: maximum building coverage 25%7
Floodplain RV placement
Placement exceeding 180 days per year triggers city flood-protection requirements8

Who to call

Building permits

Oglesby City Hall / Building Inspector

City building-permit applications and questions; ask City Hall for the zoning administrator and city floodplain review.

815-883-3389

110 East Walnut Street Oglesby, IL 61348

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

Septic permits

LaSalle County Health Department - Sewage Disposal Program

Permitting and inspection of individual private sewage disposal systems in LaSalle County, including city parcels using septic.

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

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

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Do you need a building permit in Oglesby, IL?

Oglesby requires a city building permit for new homes, garages, sheds, room additions, driveways and the other improvements listed on the city building-code page.1 Changes to a building’s footprint or exterior framing, and roof replacement, also require a building permit in Oglesby.1 Ask City Hall about the exact scope of a repair before scheduling work; Oglesby expressly says construction cannot begin until the building permit has been issued.9 Electrical service work and connections to city plumbing mains have separate permit requirements.1

Does Oglesby have zoning, lot-size rules and setbacks?

Oglesby has its own zoning inside city limits, including estate residential, single-family residential, general residential and agricultural districts.5 Oglesby’s allowed uses and dimensional standards depend on the parcel’s district; ask City Hall for the district and the applicable lot-area, yard and height standards before choosing a house plan.5 In Oglesby’s A agricultural district, maximum building coverage is 25%.7 We could not confirm a city minimum dwelling size or authorization for an accessory dwelling; ask the city zoning official about the proposed dwelling and use.2

How do septic permits work inside Oglesby?

For an Oglesby property using a private sewage system, LaSalle County Health Department administers septic permitting and inspection.3 Installing or repairing an individual sewage disposal system requires a septic permit and inspection by an environmental health practitioner.10 The county application requires a completed application, the $230 fee and an onsite survey by department personnel before a construction permit is issued; the application says the fee is returned if approval is denied.4 We could not confirm when Oglesby requires municipal sewer or water connection; ask City Hall before planning a private system.1

Can you live in an RV or tiny home in Oglesby?

We could not confirm permission to occupy an RV, camp temporarily or live in a tiny home on an Oglesby parcel; ask the city zoning official about the proposed use before buying or moving onto the site.2 Oglesby’s floodplain provisions apply building-protection requirements to travel trailers or RVs placed for more than 180 days per year in the floodplain.8 That floodplain threshold does not establish general permission for RV living elsewhere in Oglesby; the city’s district-specific use rules still need to be addressed.85

Building a home in Oglesby: what are the steps, in order?

  1. Ask City Hall to identify the Oglesby zoning district and review the proposed residential use and dimensional standards.5
  2. Ask the city to review floodplain constraints where the Oglesby site lies in a floodplain.8
  3. Confirm the water and sewer plan with City Hall; if using septic, submit the county health application and arrange the onsite survey.14
  4. Apply for the city building permit and applicable electrical or plumbing permits, and wait for building-permit issuance before starting work.1
  5. Arrange applicable plumbing inspections; the city lists underslab, rough-in and finished inspections.1

What should you check before buying land in Oglesby?

Confirm whether the parcel is inside Oglesby: city zoning applies within Oglesby, while the county’s zoning rules govern unincorporated LaSalle County.211 For land outside city limits, use the LaSalle County guide for the county zoning answer.11 For an Oglesby parcel, ask City Hall about municipal utility connections and the county health department about any proposed private well or septic system.1123 Oglesby’s resident-owner plumbing exception concerns who may perform plumbing work; it does not establish exemption from building permits or inspections.6

Watch-outs

  • Ask City Hall which current code editions and amendments apply to the Oglesby project before paying for plans.13
  • Oglesby floodplain building-protection requirements apply to new buildings and specified additions, improvements and RV placements.8
  • We could not confirm an agricultural building-permit exemption inside Oglesby; ask City Hall before treating a farm structure as exempt.1

Sources

  1. Oglesby City Hall / Building Inspector (oglesbyil.gov)
  2. Zoning & Incentives | City of Oglesby, IL (Oglesby), quoted and re-checked
  3. Sewage Disposal, quoted and re-checked
  4. Sewage Disposal, quoted and re-checked
  5. Oglesby Code § 14.02.010 - Residential districts (Oglesby), quoted and re-checked
  6. Building Code | City of Oglesby, IL (Oglesby), quoted and re-checked
  7. 14.02.040 - Agricultural district (Oglesby), quoted and re-checked
  8. Oglesby Code § 15.12.020 - Definitions (Oglesby), quoted and re-checked
  9. Resident Information | City of Oglesby, IL (Oglesby), quoted and re-checked
  10. LaSalle County Health Department - Sewage Disposal Program (lasallecountyil.gov)
  11. Land Use Department, quoted and re-checked
  12. LaSalle County Health Department (lasallecountyil.gov)
  13. Building Code | City of Oglesby, IL (Oglesby), quoted and re-checked

Written October 11, 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.

Answers from the rulebook for Oglesby

Oglesby’s own rules

  • Building permitRequired

    New homes and listed improvements inside Oglesby city limits.

    • Work cannot begin until the permit has issued.
    • The city lists footprint changes, exterior framing changes, roof replacement, signs, decks and patios, fences, in-ground pools, sheds, garages, room additions, driveways, new homes, and commercial buildings.
    “Work cannot begin until a building permit has been issued.”
  • Owner-builder exemptionConditional

    Plumbing work at an owner-occupied residence inside Oglesby city limits.

    • The exemption stated on the city page is limited to work done by an owner who resides in the residence.
    • Other plumbing-permit and inspection requirements remain applicable.
    “All plumbing work, unless done by an owner who resides in the residence, is to be done by a State of Illinois licensed plumber.”
  • Building code adoptedAdopted (with conditions)

    Building work inside Oglesby city limits.

    • The city page identifies 2018 editions of the International Building, Residential, and Existing Building Codes; 2017 editions of the electrical and fire codes; the Illinois Plumbing Code; and subsequent amendments.
    “Oglesby has adopted the 2018 Editions of the International Building Code, International Residential Code, International Existing Building Code, 2017 Editions International Code Council of Electrical Code, International Fire Code and the state of Illinois Plumbing code and any subsequent amendments.”
  • InspectionsLimited

    Electrical and plumbing work inside Oglesby city limits.

    • Electrical inspections are required for underground service, rough-in, and finished work when applicable.
    • Plumbing inspections are required for underslab, rough-in, and finished work when applicable.
    “Electric Permits are required for new service, service upgrades and the replacement of existing wiring. An inspection is required for underground service, rough in and finished (when applicable).”
  • Local zoningPresent (with conditions)

    Land inside Oglesby city limits.

    • Land use remains subject to the adopted Land Development Code and district-specific standards.
    “Oglesby Land Development Code - Adopted October 1, 2018”
  • Zoning districtsPublished (with conditions)

    Zoning districts inside Oglesby city limits.

    • Residential districts listed are RE, R1A, R1, R2, and R3.
    • The code separately establishes the A agricultural district.
    “Establishment of Districts: The following residential districts are established in the city of Oglesby: Abbreviation District Name RE Estate residential district R1A Single-family residential district R1 Single-family residential district R2 Single-family residential district R3 General residential district”
  • Lot coverageSpecified

    Oglesby A agricultural district.

    • The A district uses the nonresidential dimensional table.

    maximum building coverage: 25 percent

    “Maximum building coverage - 50% 50% 75% 50% 60% 25%”
  • Who permits septicMixed (with conditions)

    Private sewage disposal systems inside Oglesby city limits where public sewer is unavailable.

    • Oglesby regulates availability of public sewer and private-system connection conditions.
    • The County Health Department's application requires submission to that department and an onsite survey before a construction permit is issued.
    “A permit for construction will not be issued until a completed application and fee have been submitted to the LaSalle County Health Department and an onsite survey performed by department personnel.”
  • Septic permitRequired

    Construction of a private sewage disposal system on an Oglesby parcel where public sewer is not available.

    • The County Health Department form requires a completed application, fee, and onsite survey before construction permit issuance.
    • The city code provides that no permit may issue for subsurface soil absorption where lot area is under 20,000 square feet.

    private sewage disposal permit application fee: 230 USD (Fee is returned if the permit is denied.) · minimum lot area for subsurface soil absorption permit: >= 20000 square feet

    “A permit for construction will not be issued until a completed application and fee have been submitted to the LaSalle County Health Department and an onsite survey performed by department personnel.”
  • Septic inspectionRequired

    New private sewage disposal system construction on an Oglesby parcel where public sewer is not available.

    • The Health Department must be notified before backfilling.
    • The stated inspection result addresses compliance with current Illinois Department of Public Health standards and is not a warranty.
    “The Health Department must be notified for a final inspection sewage disposal system construction before backfilling.”
  • Off-grid sanitationLimited

    Private sewage disposal inside Oglesby city limits.

    • Private sewage is only addressed where public sanitary or combined sewer is not available under § 13.18.180.
    • A private system must comply with Article III, and subsurface soil absorption cannot be permitted on a lot below 20,000 square feet.
    • Once city public sewer becomes available, connection and abandonment of the private system are required.

    minimum lot area for subsurface soil absorption permit: >= 20000 square feet

    “Where a public sanitary (or combined) sewer is not available under the provisions of Section 13.18.180, the building sewer shall be connected to a private sewage disposal system complying with the provisions of this article.”
  • Mandatory utility hookupSewer (with conditions)

    Properties inside Oglesby city limits abutting a street, alley, or right-of-way containing a city public sanitary or combined sewer within 100 feet of the property line.

    • Connection and suitable toilet facilities are required at owner expense within 90 days after official notice.
    • The code's separate availability provision requires connection from a private system when public sewer becomes available; it specifies a 60-day deadline and filling the private system.
    • No city water-connection availability requirement was located.

    public-sewer distance from property line: <= 100 feet (Applies to qualifying city sewer abutments after official notice.) · connection deadline after official notice: <= 90 days (Under § 13.18.180.) · connection deadline when sewer becomes available to a private-system property: <= 60 days (Under § 13.18.260.)

    “When a public sewer becomes available, the building sewer shall be connected to said sewer within sixty days and the private sewage disposal system shall be cleaned of sludge and filled with clean bank-run gravel or dirt by the property owner.”
  • Subdividing landRegulated (with conditions)

    New subdivisions and related developments inside Oglesby city limits that involve floodplain hazards.

    • The cited requirements apply to new subdivisions, manufactured-home parks, annexation agreements, planned unit developments, and additions to such parks and subdivisions.
    • Proposal must include flood elevation/boundary information, floodway boundary when applicable, and a signed professional-engineer drainage statement.
    “New subdivisions, manufactured home parks, annexation agreements, planned unit developments, and additions to manufactured home parks and subdivisions shall meet the damage prevention and building protections standards of Sections 15.12.060 and 15.12.070 of this chapter.”
  • Driveway accessRequired

    New or replacement driveways inside Oglesby city limits.

    • The building page lists driveways among improvements needing a building permit.
    • Attached single-family homes have additional common-access-drive and minimum-depth standards.
    “Building permits are also required for most home improvements including the new installation or replacement of the following: Signs Decks & Patios Fences In-ground Pools Sheds Garages Room additions Driveways New home and commercial buildings”
  • Building in a floodplainRequired

    Buildings and development in Oglesby floodplain areas.

    • The code states this obligation is in addition to state permit and damage-prevention requirements.
    • The protection rule includes new construction, qualifying additions, substantial improvements, substantially damaged building repairs, new manufactured-home installation, RV/travel-trailer placement over 180 days per year, and repetitive loss.
    “In addition to the state permit and damage prevention requirements of Section 15.12.060 of this chapter, all buildings located in the floodplain shall be protected from flood damage below the flood protection elevation.”
  • Permit feesPublished (with conditions)

    City building permits inside Oglesby city limits.

    • The city page links a fee list; individual building-permit amounts were not visible in the opened page.
    • A private sewage-disposal permit application separately states a $230 fee, returned if permit is denied.

    private sewage disposal permit application fee: 230 USD (Returned if permit is denied.)

    “This is your permit application. There is a two hundred thirty ($230.00) dollar application fee for a private sewage disposal system permit. If a permit is denied, the fee shall be returned to the applicant.”
  • Permit processPartial

    Building permits and private sewage permits for work inside Oglesby city limits.

    • Building-permit applications are available at City Hall.
    • Private sewage construction permit requires completed application, fee, and onsite survey by County Health Department personnel.
    • The city advises applicants to contact City Hall if uncertain whether work needs a permit.
    “A permit for construction will not be issued until a completed application and fee have been submitted to the LaSalle County Health Department and an onsite survey performed by department personnel.”

Rules another office applies inside Oglesby

Oglesby does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Living in an RVLimited

    Travel trailers or recreational vehicles installed on a site in Oglesby floodplain areas for more than 180 days per year.

    • This is a floodplain building-protection limit, not a finding that RV occupancy is allowed in every zoning district.
    • Flood protection applies to qualifying development below the flood protection elevation.

    placement duration triggering floodplain protection: > 180 days per year

    “Installing a travel trailer or recreational vehicle on a site for more than one hundred eighty days per year.”
  • Manufactured homesLimited

    Manufactured homes installed on new sites or new manufactured homes installed on existing sites in Oglesby floodplain areas.

    • Floodplain building protection applies.
    • Manufactured homes or travel trailers permanently installed on site must be elevated to or above flood protection elevation and tied down under the cited rule.
    “Installing a manufactured home on a new site or a new manufactured home on an existing site. (The building protection requirements do not apply to returning a manufactured home to the same site it lawfully occupied before it was removed to avoid flood damage).”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Oglesby or LaSalle County directly.

  • Certificate of occupancy — Occupancy of buildings inside Oglesby city limits.
  • Minimum dwelling size — New dwellings inside Oglesby city limits.
  • Camping on your land — Temporary camping on private land inside Oglesby city limits.
  • Tiny homes — Tiny-home occupancy inside Oglesby city limits.
  • Accessory dwellings — Accessory dwelling units inside Oglesby city limits.
3 more unanswered
  • Well permit
  • Agricultural exemption
  • Short-term rentals

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.

Unanswered questions are usually a sign that Oglesby publishes no rule on the point, not that none exists. LaSalle County’s page lists the county offices to call.

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