Accessory Structures in Macon County, IL (2026)
2 rules for unincorporated Macon County, Illinois.
Verified from official government sources
ADU Rules
Macon County's zoning code does not allow guest houses, servants' quarters, apartments, or similar living units as accessory buildings on residential or agricultural lots. Section 155.051(B)(11) requires a special use permit from the Board of Appeals before any accessory structure can include separate living quarters.
Macon County Blocks Guest Houses as Accessory Units
Significant RestrictionsMacon County Code § 155.051(B)(11)
(11) Accessory building shall only be built for and used for permitted accessory uses. Guest houses, servants quarters, apartments, and the like shall not be permitted as accessory buildings, except when issued a special use permit.
Shed & Carport Rules
Sheds and other accessory buildings in unincorporated Macon County must sit at least ten feet from the house, follow the same side and rear setbacks required for the main structure, and stay under 25 feet tall. Anything longer than ten feet on a side needs a building permit before construction begins.
Macon County Shed Size, Setback, and Permit Rules
Some RestrictionsMacon County Code § 155.051(B)(7), (8), (9)(a)
(7) No accessory building shall be placed closer than ten feet from a principal building. No accessory building shall be attached to a principal building unless the accessory building meets all of the construction requirements for a principal building. ... (8) Residential accessory building, including those on less than ten acres zoned A1 – Agricultural, shall not exceed 25 feet in height, ...
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