Accessory Structures in Rock Island County, IL (2026)
1 rule for unincorporated Rock Island County, Illinois.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Rock Island County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Shed & Carport Rules
In unincorporated Rock Island County a shed, detached garage or other accessory building needs a 5-foot setback from the side and rear lot lines in the AG, SE and R districts. County-wide, accessory structures cannot cover more than 30% of the lot, and on R-district lots they cannot exceed the primary house's ground-floor footprint or 15 feet in height.
Rock Island County Shed and Accessory Building Rules
Some RestrictionsRock Island County Code of Ordinances § 154.039(A)
No accessory building or buildings shall be erected in any required court or yard. When erected in a side yard in an AG-1, AG-2, SE-1, SE-2, or any R District, the accessory building shall maintain a five-foot setback. When erected in a rear yard in an AG-1, AG-2, SE-1, SE-2, or any R District, the accessory building shall maintain a five-foot setback. In any zoning district, accessory building...
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