Grading & Drainage: Mount Vernon vs Yonkers
How do grading & drainage rules compare between Mount Vernon, NY and Yonkers, NY?
Mount Vernon and Yonkers have similar restriction levels.
Mount Vernon, NY
Westchester County
Grading and drainage plans reviewed by the Building Department. Runoff cannot be directed onto adjoining property. Tight urban lots make drainage plans critical.
View full Mount Vernon rules →Yonkers, NY
Westchester County
Yonkers requires grading permits for significant earthwork. Drainage alterations that redirect stormwater onto neighboring parcels violate NY common law and Yonkers Code.
View full Yonkers rules →Key Facts Comparison
| Fact | Mount Vernon | Yonkers |
|---|---|---|
| Code | NYS RC R401.3 | - |
| Slope | 6 inches in 10 feet | - |
| Review | Building Department | - |
| Neighbor Runoff | Prohibited | - |
| Permit | - | Engineering Dept approval |
| Walls >4 ft | - | Engineered drawings |
| Runoff | - | Must stay on-site |
| Discharge | - | To approved drains only |
Highlighted rows indicate differences between cities.
Mount Vernon FAQ
Can I drain my downspouts into my neighbor's yard?
No. Runoff must stay on your property or discharge to an approved public drain.
How much slope do I need around my foundation?
6 inches of fall within the first 10 feet per NYS Residential Code R401.3.
Does Mount Vernon review grading plans for rowhouses?
Yes. The Building Department requires a site grading plan showing finished grades and discharge points, especially on tight urban lots.
Yonkers FAQ
Can I regrade my backyard without a permit?
Minor landscaping yes; substantial regrading affecting drainage patterns requires Yonkers Engineering Department review.
Do I need a permit for a retaining wall in Yonkers?
Yes if the retaining wall exceeds 4 feet in height or sits adjacent to property lines. Engineered drawings and building permits are required under Yonkers Engineering Department rules.
Can I send my Yonkers stormwater runoff onto my neighbor's property?
No. Under Yonkers Code and NY common law, drainage must be managed on-site or directed to approved municipal storm drains. Discharging runoff onto neighbors or public ways is prohibited.
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