Champaign County, IL Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- R-1/R-2/R-3 coverage cap
- 30% of lot area (Section 5.3)
- R-4 coverage cap
- 40% of lot area
- AG-1/CR coverage cap
- 20% of lot area
- AG-2 coverage cap
- 25% of lot area
- Impervious surface override
- 16% cap, lots owned since Jan. 1, 1998
- Maximum fine
- $500 per day violation (Section 10.2.3)
- Applies to
- Unincorporated county area only
Summary
Champaign County's Zoning Ordinance caps building coverage at 30 percent of lot area in the R-1, R-2 and R-3 residential districts under Section 5.3, rising to 40 percent in R-4 and dropping to 20 percent on AG-1 and CR lots. A separate 16 percent impervious-surface cap under Section 4.3.10.B can override the district's coverage limit on lots held in common ownership since January 1, 1998.
COVERAGE: The percentage of the LOT AREA covered by the BUILDING AREA. ... B. The limits on maximum LOT COVERAGE contained in Section 5.3 notwithstanding, no more than 16 percent of the surface of any LOT or LOTS in common ownership on January 1, 1998 shall consist of impervious area, including paving consisting of gravel and rock and including any specific impervious area addition to adjacent public STREETS that is required to accommodate the USE or CONSTRUCTION, unless the LOT is exempt pursuant to, or complies with, the Storm Water Management and Erosion Control Ordinance. ... R-1 Single FAMILY 9,000 80 35 2 1/2 85 75 55 10 20 30% (5), (8) Residence
Full Breakdown
' In the R-1 Single Family Residence and R-2 Single Family Residence districts, coverage is capped at 30 percent, the same limit that applies to the R-3 Two Family Residence district. The R-4 Multiple Family Residence district allows 40 percent coverage, reflecting its higher-density housing. Rural and conservation districts are more restrictive: AG-1 Agriculture and CR Conservation-Recreation lots are capped at 20 percent, while AG-2 Agriculture allows 25 percent. Business and industrial districts run higher still, from 35 percent in B-2 up to 100 percent in the B-5 Central Business district and 65 percent in I-2 Heavy Industry.
B layers a separate, stricter limit on top of the district table: 'no more than 16 percent of the surface of any LOT or LOTS in common ownership on January 1, 1998 shall consist of impervious area,' counting gravel and rock paving and any impervious additions required to serve adjoining public streets, unless the lot is exempt from or complies with the county's Storm Water Management and Erosion Control Ordinance. 3 percentage would otherwise allow more building or paving on those older platted lots. A ties the two together: any USE or CONSTRUCTION requiring a Zoning Use Permit must also comply with the county's Storm Water Management and Erosion Control Ordinance, which is where the impervious-area limit is enforced during permit review.
Violations & Fines
Exceeding the Section 5.3 coverage percentage or the Section 4.3.10.B impervious cap is a zoning violation subject to the same enforcement as any other: the Zoning Administrator investigates complaints under Section 10.1, and Section 10.2.3 makes the violation a petty offense punishable by a fine up to $500, with each day of continued noncompliance after notice a separate offense. The county may also seek a court order to abate or remove the excess coverage under Section 10.2.2.
Frequently Asked Questions
What percentage of my lot can I cover with a house in unincorporated Champaign County?
Is there a separate limit on driveways and other paving?
Does the lot coverage limit apply inside Champaign or Urbana?
What happens if a lot exceeds the coverage limit?
Sources & Official References
Other rules in Champaign County
Compare Champaign County to another location·View the Illinois building setbacks & zoning overview
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