Grading & Drainage: Mount Vernon vs New Rochelle
How do grading & drainage rules compare between Mount Vernon, NY and New Rochelle, NY?
Mount Vernon and New Rochelle 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 →New Rochelle, NY
Westchester County
Grading and drainage plans required for new construction and major site work. Drainage must not adversely affect adjacent properties. Building Department reviews grading plans as part of site plan and building permit applications.
View full New Rochelle rules →Key Facts Comparison
| Fact | Mount Vernon | New Rochelle |
|---|---|---|
| Code | NYS RC R401.3 | - |
| Slope | 6 inches in 10 feet | - |
| Review | Building Department | - |
| Neighbor Runoff | Prohibited | - |
| Plans | - | Required for new construction |
| Reviewer | - | Building + Engineering |
| Neighbor impact | - | Prohibited |
| Topic | - | Grading Drainage |
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.
New Rochelle FAQ
Can I regrade my yard?
Minor regrading typically doesn't need a permit, but you cannot redirect water onto neighbors or into the public right-of-way.
Does my New Rochelle home addition need a drainage plan?
Yes. New construction and major additions trigger Building and Engineering Department review of grading and stormwater drainage as part of the permit process.
What if my New Rochelle neighbor's regrading is flooding my yard?
Report it to the Building Bureau; directing runoff onto adjacent property violates city grading rules. You may also have a private nuisance claim under NY common law.
Compare other topics
See how Mount Vernon and New Rochelle compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool