Grading & Drainage: White Plains vs Yonkers
How do grading & drainage rules compare between White Plains, NY and Yonkers, NY?
White Plains and Yonkers have similar restriction levels.
White Plains, NY
Westchester County
Grading permit required when excavating, filling, or regrading alters drainage on your property. Lots must drain toward streets or approved swales — not onto neighbors. Retaining walls over 4 ft require a building permit and engineered plans.
View full White Plains 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 | White Plains | Yonkers |
|---|---|---|
| Permit | Grading / building permit | Engineering Dept approval |
| Wall threshold | 4 ft engineered | - |
| Runoff | Cannot divert to neighbor | Must stay on-site |
| Impervious cap | Zone-specific (40-50%) | - |
| Walls >4 ft | - | Engineered drawings |
| Discharge | - | To approved drains only |
Highlighted rows indicate differences between cities.
White Plains FAQ
Can I regrade my yard to raise it above my neighbor's?
Only if the new grade does not increase runoff onto adjacent properties. WP requires drainage be managed on your own lot or via approved piped outlets.
Do I need a permit for a retaining wall in White Plains?
Retaining walls over 4 feet require a building permit with engineered plans. Shorter walls may still need review if they affect drainage.
What is the impervious surface limit in White Plains residential zones?
Impervious surface caps typically range from 40-50% in residential districts, depending on the specific zone.
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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