Retaining Walls: Babylon vs Islip
How do retaining walls rules compare between Babylon, NY and Islip, NY?
Babylon, NY
Suffolk County
No data available yet for Babylon.
Islip, NY
Suffolk County
Retaining and other walls greater than 18 inches above average undisturbed grade must obtain a permit before construction and be set back from any property line by at least 4 feet or a distance equal to the wall's height, whichever is greater.
View full Islip rules →Key Facts Comparison
| Fact | Babylon | Islip |
|---|---|---|
| Permit threshold | - | Walls over 18 inches above grade |
| Setback | - | Min. 4 ft or equal to wall height, whichever is greater |
| Walls 18 in or less | - | No permit/setback unless Town Engineer directs |
| Code Section | - | Sec. 68-406F, 68-406G |
Highlighted rows indicate differences between cities.
Babylon FAQ
No FAQs available.
Islip FAQ
Do I need a permit for a retaining wall in Islip?
Yes for any wall greater than 18 inches above average undisturbed grade. Section 68-406F requires a permit before construction; walls 18 inches or less generally do not (Sec. 68-406G).
How far from the property line must a retaining wall be?
A wall over 18 inches must be set back at least 4 feet, or a distance equal to its height above average undisturbed grade, whichever is greater (Sec. 68-406F).
What about a marine bulkhead?
For marine bulkheads a Town of Islip Wetlands and Watercourses Permit may serve as the required permit, subject to review by the Divisions of Building and Engineering (Sec. 68-406F).
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