Accessory Structures in Peoria County, IL (2026)
2 county-level rules, plus city-specific rules for 1 city in Peoria County, Illinois.
Verified from official government sources
ADU Rules
Peoria County allows one accessory dwelling per residential lot, but only within, or attached to, the principal detached dwelling: it must share the driveway, stay under half the main home's floor area, and cannot be rented to non-family members.
Peoria County Accessory Dwelling Unit Rules
Significant RestrictionsPeoria County UDO § 5.13.2
An accessory dwelling shall be permitted in any residential district in accordance with the requirements in this subsection. Except as provided in subsection 5.13.2-7 below, all accessory dwellings shall be located within the primary dwelling.1.The principal use of the lot shall be a detached dwelling.2.No more than one accessory dwelling shall be located on a lot.3.The accessory dwelling shall...
Shed & Carport Rules
A backyard shed in unincorporated Peoria County is capped at the footprint of the house or 1,300 square feet (plus 750 for a garage) on subdivision lots, with larger limits on agricultural land, and every shed must meet the underlying district's setback line.
Peoria County Shed Size & Setback Rules
Some RestrictionsPeoria County UDO § 5.13.3, § 5.13.4
3.For lots and parcels used for residential purposes in the A-1 or A-2 Agricultural Districts which are five (5) acres or less and which are not in platted subdivisions, the total floor area of any accessory building shall not exceed one thousand three hundred (1,300) square feet, plus three hundred (300) square feet per acre. Fractional acres shall be rounded to the nearest whole acre.4.For lo...
Accessory Structures by City in Peoria County
1 cities in Peoria County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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