Accessory Structures in Kankakee County, IL (2026)
2 rules for unincorporated Kankakee County, Illinois.
Verified from official government sources
ADU Rules
In unincorporated Kankakee County's agriculture, residence and rural estate districts, County Code § 121-283(b) allows only one nonagricultural single-family dwelling per lot. That flatly rules out a garage apartment, in-law suite or other accessory dwelling unit as a second home on a residential parcel.
Kankakee County Bars Second Dwellings Per Lot
Heavy RestrictionsKankakee County Code § 121-283(b)
Number of buildings on a lot. In the agriculture, residence, and rural estate districts, every nonagricultural single-family dwelling hereafter erected or structurally altered shall be located on a lot, and there shall be not more than one such dwelling on a lot.
Shed & Carport Rules
In unincorporated Kankakee County, a detached shed or other accessory building must sit at least ten feet from the principal dwelling and five feet from an interior rear lot line. In a residence district it cannot exceed one story or 22 feet in height. The Planning Department enforces these limits under County Code § 121-281.
Kankakee County Accessory Building and Shed Rules
Some RestrictionsKankakee County Code § 121-281(b)
(b)Except as otherwise regulated herein, a permanent accessory building or structure hereafter erected, altered, enlarged, or moved on a lot shall conform with the following:(1)No detached accessory building shall be nearer than ten feet from the nearest wall of a principle building, except that a detached accessory building of the type of construction approved for safety by the planning direct...
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