New York, NY Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Required freeboard
- 2 feet above base flood elevation
- Applies to
- new builds & substantial improvements in SFHAs
- Enforced by
- DOB commissioner, city floodplain administrator
- Coastal high-hazard areas
- same 2-ft freeboard under Table 4-1
- Governing standard
- ASCE 24-14, as amended by NYC
Summary
New York City's Building Code requires new construction and substantially improved buildings in FEMA flood hazard areas to elevate the lowest floor at least 2 feet above the base flood elevation, a citywide freeboard margin set by amendments to ASCE 24-14.
Table 2-1 of Section 2.3 (Elevation Requirements) is amended to read as follows: Table 2-1 Minimum Elevation of the Top of Lowest Floor. Flood Design Class 1: DFE = BFE + 2 ft. Flood Design Class 2: DFE = BFE + 2 ft. Flood Design Class 3: DFE = BFE + 2 ft. Flood Design Class 4: DFE = BFE + 2 ft, or 500-year flood elevation, whichever is higher.
Full Breakdown
NYC Building Code Appendix G designates the DOB commissioner as floodplain administrator for FEMA-mapped Special Flood Hazard Areas. Under the city's amendments to ASCE 24-14 (Table 2-1 and Table 4-1), new construction and substantial improvements, including in coastal high-hazard V-Zones and Coastal A-Zones, must have their lowest floor, or lowest horizontal structural member in coastal zones, at least 2 feet above the base flood elevation (BFE), yielding a design flood elevation (DFE) of BFE+2 ft for every Flood Design Class. Applicants must first submit sealed flood zone compliance plans showing the base and design flood elevations before DOB will issue a permit.
Violations & Fines
DOB will not approve permits or issue a certificate of occupancy without flood zone compliance plans meeting Appendix G; noncompliant construction risks stop-work orders and civil penalties under Title 28's violations provisions (Admin Code Ch. 2).
Frequently Asked Questions
How much freeboard does NYC require above the base flood elevation?
Does the 2-foot freeboard rule apply in coastal V-Zones too?
Sources & Official References
Other rules in New York
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