ADU rules in Tinley Park, IL β also called accessory dwelling unit regulations or granny flat ordinances β cover setbacks, owner-occupancy, parking, and permit requirements.
Tinley Park does not have a permissive accessory dwelling unit (ADU) ordinance. Second kitchens, separate dwelling units, or rental of a secondary unit on a single-family lot are generally not permitted in residential zoning districts. Some properties with legal non-conforming two-family status may exist, but creating new ADUs requires a zoning variance.
Tinley Park's zoning ordinance establishes single-family (R-1, R-2, R-3) and multi-family (R-4, R-5) residential districts. Single-family districts permit only one dwelling unit per lot. The Village does not have a specific ADU or accessory dwelling ordinance. Finished basements, garage conversions, and second-floor additions are permitted only as part of the single-family dwelling and may not function as separate living units with their own kitchens, separate entrances, and separate utility connections. Installing a second kitchen (defined by the presence of a stove or other permanent cooking appliance) in a single-family home typically requires a statement that it will not be used for a separate dwelling unit and often prompts additional zoning review. 'In-law arrangements' where family members share the home without creating a separate unit are generally acceptable. Creating a legal ADU on a single-family lot would require a zoning text amendment or a use variance approved by the Zoning Board of Appeals and Village Board, which is uncommon. Properties legally established as two-family dwellings prior to zoning changes may retain non-conforming status.
Operating an illegal ADU typically results in a notice of violation from Code Enforcement at (708) 444-5100 requiring removal of the second kitchen, separate entrance, or other features creating a separate unit. Fines begin at $75 per day. Rental of an illegal unit may also result in landlord registration and life-safety enforcement.
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Side-by-side rule comparisons with other cities in Cook County.
See how other cities in Cook County handle adu rules.
See how Tinley Park's adu rules rules stack up against other locations.
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