Peoria County, IL Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- R-1 lot coverage cap
- 30 percent of lot area
- Exempt uses
- Agriculture, telecom facilities, exempt utilities
- Coverage includes
- Accessory structures count toward the cap
- Commercial districts
- Up to 65-80 percent impervious allowed
- Enforcement
- Peoria County Planning and Zoning Department
Summary
In Peoria County's R-1 Low Density Residential District, structures may occupy no more than 30 percent of a lot's area. Agricultural uses, telecommunications carrier facilities, and exempt public utility structures are excluded from the cap entirely.
6.5.3 Maximum Lot Coverage. 1. Agriculture, Telecommunications Carrier Facilities and Exempt Public Utility Structures: n/a. 2. All Other Uses: No more than thirty (30) percent of the area of the lot may be occupied by structures.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 52).
Full Breakdown
Peoria County's Unified Development Ordinance sets maximum lot coverage on a per-district basis in Article 6, and the county's baseline single-family zone, the R-1 Low Density Residential District, caps building footprint at 30 percent of lot area under UDO Sec. 3. That 30 percent figure covers all structures on the lot combined: the principal house plus any garage, shed, or other accessory building, since Sec. 2 requires accessory-structure coverage to be counted as part of the total "lot coverage" calculation for residential lots. The cap climbs in denser districts; the R-2 Medium Density Residential and R-3 High Density Multifamily Districts use their own Sec.
10 allow up to 65 to 80 percent impervious coverage for nonresidential development. Coverage is measured against the lot's minimum required open space: Sec. 2 also bars using the same setback, open space, or lot-area allocation to satisfy the requirements of more than one building, so a shared side yard cannot double as required open space for two structures. The Planning and Zoning Department checks proposed lot coverage at building-permit review, and the obligation to keep coverage within the district maximum is a continuing one that runs with ownership of the property, not just a one-time approval at construction.
Violations & Fines
Building or expanding a structure beyond the district's maximum lot coverage without a variance is a zoning violation enforceable by the Peoria County Planning and Zoning Department, which can withhold or revoke a building permit and require removal or reduction of the offending structure. Property owners seeking relief from the 30 percent cap must apply to the Zoning Board of Appeals for a variance rather than build first and ask later.
Frequently Asked Questions
What percentage of my lot can I build on in Peoria County's R-1 district?
Are farm buildings counted toward the Peoria County lot coverage limit?
Is the lot coverage limit the same in every Peoria County zoning district?
Sources & Official References
Other rules in Peoria County
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