Tinley Park, IL Accessory Structures: Shed Rules (2026)

Tinley Park's zoning ordinance regulates accessory structures including sheds. Sheds up to a threshold size (commonly 120 square feet) may not require a building permit but still must comply with setback and placement rules; larger sheds require a building permit. Sheds must be placed in the rear yard behind the principal dwelling and must maintain setbacks from side and rear property lines, typically 3 to 5 feet depending on zoning district and shed size. Total accessory structure coverage (combining sheds, detached garages, and similar structures) may not exceed a percentage of the rear yard. Shed height is generally limited to 15 feet or the height of the principal dwelling, whichever is less. Sheds must be anchored to the ground or a slab to resist wind uplift. Material quality should be consistent with residential neighborhood character. Sheds may not be used as dwelling units, home offices with customer visits, or for commercial storage. Prefabricated vinyl, metal, and wood sheds from home improvement retailers are common; homeowners should confirm setback dimensions before placement.