Most construction in unincorporated McLean County, Illinois requires a county building permit before work starts1. McLean County also applies zoning across its unincorporated land2. For rural homes without public sewer, the county Health Department handles private sewage disposal3.
At a glance
- Building permit
- Required before most construction in unincorporated McLean County1
- Building permit fee
- $375 for a single-family dwelling, regardless of size; verify current fees4
- Zoning
- County zoning applies outside incorporated municipalities2
- Septic
- Handled by the McLean County Health Department for properties without public sewer3
- RV living
- RV parks have specific limits; occupancy on an individual parcel is not confirmed5
- Tiny homes
- No complete county rule confirmed; ask Building & Zoning about the parcel and proposed dwelling6
- Private wells
- A state or approved local health department permit is required before a new well, modification or sealing7
- Owner-builder exemption
- Not confirmed; ask Building & Zoning before relying on one8
Who to call
Building permits
McLean County Building & Zoning Department
Construction permits, zoning, flood-hazard and subdivision regulation in unincorporated McLean County
115 E. Washington St. Rm M102 Bloomington , IL 61701
Zoning
McLean County Building & Zoning Department
Zoning districts and land-use questions for unincorporated McLean County
Septic permits
McLean County Health Department — Environmental Health Division
Private sewage disposal plan review, permits, inspections and installer licensing
200 W Front Street Bloomington , IL 61701
Contact details are copied from each office’s official page and were checked against it on September 28, 2026.
Do you need a building permit in McLean County, Illinois?
Yes. Most construction projects in unincorporated McLean County require a permit before work starts; the county specifically includes new homes, additions, detached buildings, ponds and some fences among its examples1. A single-family dwelling permit is listed at $375 regardless of size, but the county warns that fees can change and should be confirmed with Building & Zoning4. County-permitted construction generally receives a stake-out inspection, a foundation inspection and a final inspection before the occupancy permit910. Illinois does not issue the local permit for private construction; the applicable local government handles it11.
Who is the McLean County building department, and how do you reach it?
The McLean County Building & Zoning Department regulates construction in the county's unincorporated areas and also administers zoning, flood-hazard and subdivision regulations12. The office is at 115 E. Washington St. Rm M102 Bloomington , IL 61701, and its phone number is (309) 888-516012. Contact the department before design work to confirm that the parcel is outside a city, village or town and to identify the required applications. The county publishes construction-permit information and a current-fees page, while the Building & Zoning office remains the place to verify the current amount and project-specific requirements104.
Does McLean County have zoning?
Yes. McLean County zoning covers unincorporated territory outside incorporated municipalities2. The county maps identify one agricultural district, two residential districts, one commercial district and two industrial districts13. Allowed uses, setbacks, height and lot area depend on the district and use rather than one universal rural rule141516. One residential provision requires at least 22,500 square feet for a dwelling using individual sewage disposal, compared with 12,000 square feet where public or community sanitary sewer and water serve the dwelling16. Ask Building & Zoning to identify the parcel's district and confirm the applicable schedule before relying on those examples17.
How do septic permits work in McLean County?
The McLean County Health Department's Private Sewage Disposal Program regulates sewage disposal for homes and facilities that lack public sewer service3. The program approves plans, issues permits and inspects private sewage systems18. The office is at 200 W Front Street Bloomington , IL 61701, and its phone number is (309) 888-548218. Illinois requires plan approval before a new private sewage system is built, and the installer must notify the county or state health department at least 48 hours before work begins19. Only about 8.3% of McLean County soils avoid a severe USDA rating for conventional drain fields, so make septic feasibility an early purchase contingency20.
Can you live in an RV or tiny home on your land in McLean County?
McLean County's published rule addresses RV parks, not every case of someone occupying an RV on an individual parcel. A county RV park must occupy at least 2 acres, may contain no more than 20 spaces per acre, and is intended for short-term occupancy; permanent placement has additional conditions5. We could not confirm a complete rule for temporary camping outside an RV park, so ask Building & Zoning about the exact parcel and planned duration17. We also could not confirm a general tiny-home occupancy rule or minimum dwelling size. Because unincorporated land is divided into zoning districts with district-specific uses and dimensional rules, confirm how the county would classify the proposed unit before purchase216.
Building a home in McLean County: the steps, in order
- Ask McLean County Building & Zoning to confirm the parcel's jurisdiction, zoning district, allowed dwelling type, setbacks and lot requirements1214.
- Contact Environmental Health early for private-sewage plan review if public sewer is unavailable, especially because conventional drain-field suitability is severely limited across much of the county1820.
- Obtain any required private-well permit from the state or an approved local health department before well work begins7.
- Submit the county construction-permit application and verify the current fee before starting work14.
- Coordinate the county's construction inspections and complete the final inspection before the occupancy permit is issued910.
What should you check before buying land in McLean County?
Start with jurisdiction and zoning: incorporated municipalities may apply their own rules, while McLean County zoning governs unincorporated land2. Confirm septic feasibility before closing because only about 8.3% of county soils avoid severe limitations for a conventional drain field20. A new private well, an existing-well modification or abandonment work requires a permit from Illinois or an approved local health department before work begins7. For state-road access, IDOT requires a permit before work within the right-of-way of a state-maintained road21. Regulated floodway construction may also require an Illinois water-resources permit22. Finally, the county's median property-tax bill is about $4,503 per year, so review the actual parcel assessment rather than estimating from purchase price alone23.
Watch-outs
- McLean County has not confirmed a general owner-builder exemption; ask Building & Zoning whether the same permit and inspection process applies when you act as your own builder812.
- The county's RV-park rules do not answer whether you may camp or live in an RV on an individual rural parcel; get a parcel-specific answer from Building & Zoning517.
- Commercial buildings in unincorporated McLean County follow state-adopted codes for non-building-code jurisdictions, with stated exclusions that include certain small residential and exempt farm buildings24.
Sources
- Construction Permits, quoted and re-checked
- Zoning Maps, quoted and re-checked
- Septic Systems, quoted and re-checked
- Current Fees, quoted and re-checked
- McLean County, Illinois Zoning Ordinance, quoted and re-checked
- Zoning Maps (2026 county census)
- 77 Ill. Admin. Code 920.130, Water Well Permit Requirements (Illinois statewide rule), quoted and re-checked
- (2026 county census)
- Construction Permits, quoted and re-checked
- Construction Permits, quoted and re-checked
- Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
- McLean County Building & Zoning Department (mcleancountyil.gov)
- Zoning Maps, quoted and re-checked
- McLean County, Illinois Zoning Ordinance, quoted and re-checked
- McLean County, Illinois Zoning Ordinance, quoted and re-checked
- McLean County, Illinois Zoning Ordinance, quoted and re-checked
- McLean County Building & Zoning Department (mcleancountyil.gov)
- McLean County Health Department — Environmental Health Division (health.mcleancountyil.gov)
- 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Highway Permits (Illinois statewide rule), quoted and re-checked
- Permit Program (Illinois statewide rule), quoted and re-checked
- Median property tax bill: Bolthole Index county data
- Building Code Inspections for Commercial Buildings, quoted and re-checked
Written September 28, 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.