Lot Coverage Limits: Chicago vs Tinley Park
How do lot coverage limits rules compare between Chicago, IL and Tinley Park, IL?
Tinley Park has fewer restrictions than Chicago.
Chicago, IL
Cook County
Chicago controls lot coverage through Floor Area Ratio (FAR) regulations in the Zoning Ordinance (Title 17) and open space requirements. Accessory structures in rear setbacks are limited to 60% coverage of the required setback area.
View full Chicago rules →Tinley Park, IL
Cook County
Tinley Park's zoning code caps the percentage of a residential lot that can be covered by buildings and impervious surfaces. Typical R-3 districts limit principal building coverage to approximately 30-35% of lot area.
View full Tinley Park rules →Key Facts Comparison
| Fact | Chicago | Tinley Park |
|---|---|---|
| Control Method | Floor Area Ratio (FAR) | - |
| RS1 FAR | 0.50 | - |
| RS2 FAR | 0.65 | - |
| RS3 FAR | 0.90 | - |
| Rear Setback Coverage | Max 60% by accessory buildings | - |
| Open Space | Required in rear yard | - |
| R-3 Building Coverage | - | ~30-35% of lot |
| Impervious Surface | - | ~50-60% combined |
| Stormwater Tie-In | - | MWRD/county standards |
| Review | - | Community Development |
Highlighted rows indicate differences between cities.
Chicago FAQ
What is the maximum lot coverage in Chicago residential zones?
Chicago uses Floor Area Ratio (FAR) rather than a simple lot coverage percentage. FAR limits range from 0.50 in RS1 to 0.90 in RS3 districts. Accessory buildings are limited to 60% of the rear setback area.
How is FAR calculated in Chicago?
FAR equals total floor area divided by lot area. For example, a 3,000 sq ft house on a 5,000 sq ft lot has a FAR of 0.60, which would comply with RS2 (0.65 max) but not RS1 (0.50 max).
Tinley Park FAQ
How much of my lot can I build on?
In R-3 single-family districts, building coverage is typically limited to about 30-35% of the lot area. Verify your district's exact ratio with Community Development.
Does my driveway count?
Driveways are counted toward impervious surface limits, which regulate total paved area including buildings and hard surfaces.
What if I exceed the limit?
You will need to reduce coverage, apply for a variance, or install additional stormwater detention. Work with Community Development.
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