Bolthole Index

Bureau County, Illinois

Building permits, zoning and septic rules in Princeton, Illinois

Princeton, Illinois requires a city building permit before erecting, enlarging, structurally altering or excavating for a building or structure.1 Princeton administers its own zoning inside city limits in Bureau County.2 Public sewage service is the default; an individual septic system needs written county approval and Bureau County Health Department approval.3

At a glance

Building permits
Required; apply to the city zoning administrator1
Zoning
City zoning applies inside Princeton corporate limits2
Septic
Public sewage service is the default; individual systems need county approval4
Minimum home size
R1 detached single-family dwelling: 1,200 square feet of living area5
Minimum lot size
R1 detached single-family dwelling: 9,000 square feet6
Owner-installed septic
Allowed on owner-occupied property if all requirements are met; approval still required73

Who to call

Building permits

City of Princeton Planning, Building, and Zoning Office

City building permits, zoning administration and land-development applications inside Princeton corporate limits

815-875-2631

[email protected]

2 Main Street S. Princeton, IL 61356

Online permits →

Septic permits

Bureau County Health Department

Permits and inspections for septic systems and water wells in Bureau County

815-872-5091

526 Bureau Valley Pkwy. Princeton, Illinois 61356

Online permits →

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

Off-grid gear

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

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Do you need a building permit in Princeton, IL?

Princeton requires a building permit before erecting, enlarging, structurally altering or excavating for a building or structure inside city limits.1 The City of Princeton Planning, Building, and Zoning Office issues building permits for residential and commercial development projects.8

Apply to the city zoning administrator with an accurate description of the work and a lot plan showing existing and proposed construction.9 Princeton issues the building permit only when the proposal meets the land-development title, zoning regulations and applicable building and health laws; keep the permit copy at the construction site until completion.1

Who issues building permits and zoning approvals in Princeton?

The City of Princeton Planning, Building, and Zoning Office administers building and zoning codes within Princeton corporate limits.8 Reach the city office at 815-875-2631 or [email protected]; the listed address is 2 Main Street S. Princeton, IL 61356.8

Princeton’s office also processes special-use permits, subdivisions, planned unit developments and text amendments.8 A variation from the adopted zoning and land-development code needs Planning Commission & Zoning Board of Appeals approval before the city issues a building permit.8 Septic and well permitting and inspections remain with the Bureau County Health Department.10

Does Princeton have zoning, minimum lot sizes and setbacks?

Princeton’s land-development title applies to land and water within city limits, and the city zoning administrator keeps the zoning map available to the public.211 Ask the city office to identify the parcel’s district before choosing a house design.

In Princeton’s R1 district, a detached single-family dwelling needs at least 1,200 square feet of living area and a lot of at least 9,000 square feet.56 R1 building coverage is capped at 30%.12 Princeton’s A agricultural district instead specifies a minimum lot area of 20 acres, with setbacks of 35 feet in front, 50 feet in the rear, 20 feet on an interior side and 35 feet on a corner side.1314 These requirements describe those named districts; ask the city office for the standards governing your parcel.

How do septic permits work inside Princeton?

Princeton treats public sewage service as the default for lots; a proposal using an individual sewage system needs written Bureau County approval and Bureau County Health Department approval.3 The Bureau County Health Department permits and inspects septic systems and water wells; its listed phone is 815-872-5091.15

For a private sewage disposal system, submit a complete application, soil report, system plans and the appropriate county fee to the health department.16 A complete application is processed within 5 business days, and the permit is valid for 1 year.16 Notify the health department at least 48 hours before work begins so inspection can occur before backfilling.16 Owner installation is possible on owner-occupied property when all requirements are met, including the permit and inspection requirements.7

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

We could not confirm Princeton’s rules for residential RV occupancy, temporary camping or tiny-home occupancy; ask the city Planning, Building, and Zoning Office about the proposed use before buying a vehicle or committing to a parcel. A small detached house proposed in Princeton’s R1 district must meet the district’s 1,200-square-foot minimum living area.5

Princeton’s manufactured-home park standards address park construction, alteration and expansion, requiring state and city approvals; those park standards do not establish permission to live in an RV on a private lot.17 An individual sewage system also requires county approval, so an off-grid sanitation proposal needs its own approval rather than an assumption that camping permission settles sewage disposal.18

What are the steps to build a home in Princeton?

  1. Ask Princeton’s zoning administrator to identify the parcel’s zoning district using the publicly available city zoning map.11
  2. Establish sewage service: Princeton requires public sewage service unless an individual system receives the required county approvals.3
  3. Prepare an accurate work description, lot plan and proposed construction dimensions, then submit the building permit application to Princeton’s zoning administrator.9
  4. Obtain any needed zoning variation approval before the city building permit is issued.8
  5. Secure the building permit before the covered work starts and keep a copy on site until completion.1

Ask the city office for the current fee schedule, inspection stages and occupancy requirements before scheduling construction; we could not confirm those details here. For land outside Princeton city limits, consult the Bureau County guide: Bureau County administers zoning in unincorporated areas and municipalities without their own zoning ordinance.19

Watch-outs

  • Princeton’s city building permits and zoning are separate from Bureau County Health Department septic and well approvals.810
  • An owner-installed septic allowance applies to owner-occupied property with all requirements met; it does not establish a general city building-permit exemption.71
  • We could not confirm Princeton’s floodplain development requirements; ask the city Planning, Building, and Zoning Office to review floodplain status before committing to a site.8

Sources

  1. 9-1-1: Permit Requirements (Princeton), quoted and re-checked
  2. codelibrary.amlegal.com (Princeton), quoted and re-checked
  3. 10-9-13: Sewage Disposal Facilities (Princeton), quoted and re-checked
  4. 10-9-13: Sewage Disposal Facilities (Princeton), quoted and re-checked
  5. 10-4-1: Residential Districts (Princeton), quoted and re-checked
  6. 10-4-1: Residential Districts (Princeton), quoted and re-checked
  7. Sewage Disposal System Permit — owner installation conditions, quoted and re-checked
  8. City of Princeton Planning, Building, and Zoning Office (princeton-il.com)
  9. 9-1-1: Permit Requirements (Princeton), quoted and re-checked
  10. Frequently Asked Zoning Questions, quoted and re-checked
  11. 10-1-8: Zoning Map (Princeton), quoted and re-checked
  12. 10-4-1: Residential Districts (Princeton), quoted and re-checked
  13. 10-2-4: Agricultural District (Princeton), quoted and re-checked
  14. 10-4-2: Nonresidential Districts (Princeton), quoted and re-checked
  15. Bureau County Health Department (bureaucounty-il.gov)
  16. Health Department – Bureau County, Illinois, quoted and re-checked
  17. 10-3-1: Use Table (Princeton), quoted and re-checked
  18. 10-9-13: Sewage Disposal Facilities (Princeton), quoted and re-checked
  19. Frequently Asked Zoning Questions, 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.

Answers from the rulebook for Princeton

Princeton’s own rules

  • Building permitRequired

    Erecting, enlarging, structurally altering, or excavating for a building or structure inside Princeton city limits.

    • Application is made to the zoning administrator.
    • The application must include an accurate description and, for building work, a lot plan showing existing and proposed construction.
    • The permit issues only if the work complies with the land development title, zoning regulations, and applicable building and health laws.
    • The permit copy must remain at the construction site until completion.
    “A building permit shall be secured before:”
  • Local zoningPresent

    All land and water within Princeton city limits.

    • The land development title applies to all structures and land uses within the corporate limits.
    • The code is current through Ordinance O-25-018 passed 2025-12-15.
    “This title applies to all lands and waters within the corporate limits of the city.”
  • Zoning districtsPublished

    Zoning districts inside Princeton city limits.

    • The zoning map must remain available to the public in the city zoning administrator's office.
    • The city council must publish a revised zoning map by March 31 each year unless no zoning-classification or boundary changes occurred in the prior calendar year.
    “The map must remain on file and available to the public in the office of the city zoning administrator.”
  • Manufactured homesLimited

    Manufactured homes and manufactured-home parks inside Princeton city limits.

    • The use-specific standard applies to construction, alteration, or expansion of manufactured-home parks and does not determine state licensing or govern park operation.
    • A state permit, city special-use permit, and mobile-home-park permit are required for park construction, alteration, or expansion.
    • A city license and state license are required for operation.
    • Only qualifying post-June 30, 1976 manufactured homes may locate in new or existing parks.
    • Manufactured-home parks must be at least five acres.

    minimum manufactured-home park size: >= 5 acres

    “Manufactured home parks must be at least five (5) acres in size.”
  • Who permits septicCounty (with conditions)

    Septic systems serving property inside Princeton city limits.

    • Princeton code requires public sewage service for lots unless an individual system is approved.
    • Any individual sewage system requires written Bureau County approval and Bureau County Health Department approval.
    • The Illinois private sewage disposal code controls system design.
    “Any request for individual sewage collection and disposal systems must be approved by the Bureau County health department and Illinois private sewage disposal code which control their design.”
  • Septic permitRequired

    Individual sewage collection and disposal systems proposed inside Princeton city limits.

    • Public sewage service is required unless an individual system is permitted.
    • Written Bureau County approval and Bureau County Health Department approval are required.
    • Illinois private sewage disposal requirements control design.
    “The city council will not consider approval of a preliminary plat or building permit for lots that are not proposed to be serviced by public sewage and disposal facilities unless written approval for construction of such facilities have been provided by Bureau County. Any request for individual sewage collection and disposal systems must be approved by the Bureau County health department and Illinois private sewage disposal code which control their design.”
  • Off-grid sanitationLimited

    Individual sewage collection and disposal systems serving property inside Princeton city limits.

    • Public sewage service is the rule.
    • An individual system may proceed only with written Bureau County approval and Bureau County Health Department approval.
    • The Illinois private sewage disposal code controls design.
    “unless an individual sewage collection and disposal system is permitted”
  • Permit processPartial

    Building permit applications inside Princeton city limits.

    • Applications go to the zoning administrator.
    • Applications must accurately describe the proposed work and, for building work, include a lot plan and proposed construction dimensions.
    • The zoning administrator issues the permit within a reasonable time if applicable code, zoning, building, and health requirements are satisfied.
    • A permit copy must remain on site until completion.
    “An application for the issuance of a building permit shall be made to the zoning administrator”

Rules another office applies inside Princeton

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

  • Minimum dwelling sizeSpecified

    Detached single-family dwellings in R1 district.

    • The residential dimensional table also specifies different minimum living areas for RE, R1A, R2, and R3.

    minimum living area: >= 1200 square feet

    “Single-family dwelling, detached | 1,500 | 1,500 | 1,200 | 900 | 800”
  • Minimum lot sizeSpecified

    Detached single-family dwellings in R1 district.

    • The table provides 9,000 square feet for total lot area and detached single-family dwelling area per unit.

    minimum lot area: >= 9000 square feet

    “Minimum lot area, total (square feet) | 43,560 (1 acre) | 12,000 | 9,000 | 6,000 | 6,000”
    One more reviewed finding on this topic
    • Specified — Development in the A agricultural district.
      “Minimum lot area, total (square feet) | - | - | 6,000 | 10,000 | - | - | 20 acres”
  • SetbacksSpecified

    Development in the A agricultural district.

    front setback: >= 35 feet · rear setback: >= 50 feet · interior side setback: >= 20 feet · corner side setback: >= 35 feet

    “Front [...] | 35 [...] Rear [...] | 50 [...] Interior side [...] | 20 [...] Corner side [...] | 35”
  • Lot coverageSpecified

    Development in the A agricultural district.

    maximum building coverage: <= 25 percent

    “Maximum building coverage (percent) [...] | 25”
    One more reviewed finding on this topic
  • Building heightSpecified

    Principal buildings in R1 district.

    • Accessory buildings have a separate 15-foot maximum.
    • Certain public and civic buildings may exceed maximum height requirements under Section 10-4-3(L)(3).

    maximum principal-building height: <= 35 feet (Certain public and civic buildings may exceed the maximum.)

    “Maximum height, principal buildings (feet)3 | 35 | 35 | 35 | 35 | 55”
    One more reviewed finding on this topic
    • Specified — Principal and accessory buildings in the A agricultural district.
      “Maximum height, principal and accessory buildings (feet) [...] | 70”

Still unanswered

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

  • Owner-builder exemption — Owner-builders performing construction inside Princeton city limits.
  • Building code adopted — Building-code adoption for land inside Princeton city limits.
  • Inspections — Building inspections for construction inside Princeton city limits.
  • Certificate of occupancy — Certificates of occupancy for buildings inside Princeton city limits.
  • Living in an RV — Residential occupancy of recreational vehicles inside Princeton city limits.
7 more unanswered
  • Camping on your land
  • Tiny homes
  • Agricultural exemption
  • Subdividing land
  • Building in a floodplain
  • Short-term rentals
  • Permit fees

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 Princeton publishes no rule on the point, not that none exists. Bureau County’s page lists the county offices to call.

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