Oak Lawn vs Tinley Park
How do grading & drainage rules compare between Oak Lawn, IL and Tinley Park, IL?
Oak Lawn and Tinley Park have similar restriction levels.
Oak Lawn, IL
Cook County
Oak Lawn requires new construction and significant improvements to maintain positive drainage away from structures without adversely affecting neighboring properties. Grading plans are reviewed at building permit. Surface water may not be discharged directly onto adjacent properties.
View full Oak Lawn rules →Tinley Park, IL
Cook County
Tinley Park regulates grading and drainage on residential properties to prevent water from being directed onto neighboring lots or creating flooding. Minor grade changes typically do not require a permit, but substantial grading requires a permit and must not alter established drainage patterns. Sump pump and downspout discharge must be directed to lawns or storm sewer, not onto neighbors or sanitary sewer.
View full Tinley Park rules →Key Facts Comparison
| Fact | Oak Lawn | Tinley Park |
|---|---|---|
| Slope from Foundation | 2% minimum | - |
| Extension | 10 feet from foundation | - |
| Downspout to Sewer | Prohibited | - |
| Sump to Yard | Not to sanitary | - |
| Final Inspection | Required pre-CO | - |
| Permit | - | Large grading yes |
| Drainage Pattern | - | Preserve established |
| Sump Discharge | - | Lawn or storm sewer |
| Sanitary Sewer | - | Discharge prohibited |
| Downspouts | - | Splash to lawn |
Highlighted rows indicate differences between cities.
Oak Lawn FAQ
Can water from my yard drain to my neighbor's?
Not as a result of your grading changes. Oak Lawn's rules prevent creating new or increased drainage onto neighboring properties. Preserve or re-establish historic drainage patterns.
Where should my downspouts discharge?
Discharge away from foundations to the yard where water can infiltrate or flow to the street. Do not connect downspouts to the sanitary sewer.
Do I need a grading plan for an addition?
Yes for significant additions or new construction. A grading plan by a licensed surveyor or engineer is reviewed at building permit.
Tinley Park FAQ
Can I regrade my yard in Tinley Park?
Minor leveling is typically fine without a permit. Substantial grading, retaining walls, or changes that redirect water flow require a grading permit and review to ensure neighbors are not adversely affected.
Where should my sump pump discharge?
Sump pumps must discharge to your own lawn at least 5 feet from the foundation, or to the storm sewer with Village approval. Discharge to the sanitary sewer is prohibited and should be disconnected if discovered.
My neighbor's drainage floods my yard — what can I do?
Start with a conversation. If unresolved, contact Code Enforcement at (708) 444-5100 to investigate. Persistent issues may require a civil nuisance action under Illinois reasonable use principles.
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