How Tinley Park Handles Accessory Structures: A Practical Guide

Tinley Park maintains 137 local ordinances across all categories, and 5 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Tinley Park falls on the strict-to-permissive spectrum compared to other cities.

Shed Rules

Tinley Park requires a building permit for sheds over a specified size (typically 120 square feet). Sheds must be located in the rear yard, meet setback requirements from property lines (typically 3 to 5 feet), and may not exceed lot coverage limits. Material and height standards apply, and sheds may not be used as dwelling units.

Key details: Permit Threshold: Over ~120 sq ft. Location: Rear yard only. Setback: 3-5 ft typical. Max Height: 15 ft typical. Use: Storage only, not dwelling.

Placing a shed over the permit threshold without a permit or in violation of setbacks results in a stop-work order or an order to relocate the shed. Code Enforcement: (708) 444-5100. Fines begin at $75 per day of continued violation.

ADU Rules

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.

Key details: ADU Ordinance: No specific allowance. Single-Family Districts: One unit per lot. Second Kitchens: Additional review required. Variance Route: ZBA approval rare. Non-Conforming: May retain if pre-existing.

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.

Compared to other cities, Tinley Park takes a harder line on adu rules. The enforcement and penalty structure reflects that.

Garage Conversions

Converting a garage into living space in Tinley Park requires a building permit, zoning compliance, and maintenance of required off-street parking. The conversion may not create a separate dwelling unit. Required parking lost to conversion must be replaced elsewhere on the property, which is often infeasible on typical subdivision lots.

Key details: Permit: Required. Parking Replacement: Required on-site. Separate Unit: Not permitted. Building Code: Egress, insulation, detectors. Exterior: Must match dwelling.

Unpermitted garage conversions typically result in a notice of violation requiring either permits (with inspections that may require opening walls) or restoration of the garage. Loss of required parking may require the conversion to be reversed. Code Enforcement: (708) 444-5100. Fines begin at $75 per day.

This is one of the stricter rules in Tinley Park's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Carport Rules

Tinley Park generally discourages carports in residential districts and may prohibit them or restrict them in favor of enclosed garages. Where permitted, carports require a building permit, must meet setback requirements, and must be constructed of materials consistent with the dwelling. Temporary fabric carports are often prohibited as permanent structures.

Key details: Permit: Required. Construction: Permanent with footings. Fabric Portable: Typically prohibited. Materials: Match dwelling. HOA: May prohibit entirely.

Installing an unpermitted carport results in a stop-work order or an order to remove the structure. Fabric portable carports left up long-term may be treated as unpermitted structures. Code Enforcement: (708) 444-5100. HOA restrictions are enforced privately.

Tiny Homes

Tinley Park does not have a specific tiny home ordinance. Tiny homes on foundations are regulated as single-family dwellings and must meet minimum floor area, width, and building code requirements. Tiny houses on wheels (THOW) are generally not permitted as dwelling units in residential zoning districts; they are treated as RVs subject to RV parking rules.

Key details: Tiny Home Ordinance: None specific. Foundation Tiny: Meets SFR rules. Min Size: Varies by district. THOW: Not permitted as dwelling. RV Storage: Village rules apply.

Placing a THOW as a permanent dwelling typically results in an order to remove the unit. Building a tiny home below the minimum dwelling size requires a variance from the Zoning Board of Appeals. Code Enforcement: (708) 444-5100.

This is not one of those rules that cities tend to ignore. Tinley Park actively enforces its tiny homes requirements.

The Bottom Line

Tinley Park is tougher than many cities when it comes to accessory structures. Out of the 5 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Tinley Park, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

These rules come from Tinley Park's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.