Accessory Structures in Winnebago County, IL (2026)
1 rule for unincorporated Winnebago County, Illinois.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Winnebago County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Shed & Carport Rules
Detached sheds and other accessory buildings in Winnebago County are capped at 20 feet tall, must sit 2.5 feet off rear and side lot lines, and can't cover more than 40% of the required rear yard.
Winnebago County Shed Size & Setback Rules
Some RestrictionsWinnebago County UDO Sec. 18.3.1
No detached accessory structure shall exceed twenty (20) feet or the height of the principal building, whichever is less... All accessory structures must be located a minimum of two and one-half (2.5) feet from any rear or side lot line... The combined square footage of all detached accessory structures located in the rear yard shall not occupy more than forty percent (40%) of the required rear...
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