San Diego, CA Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Freeboard requirement
- 2 feet above base flood elevation
- Applies to
- New construction and substantial improvements
- Zone AH/AO structures
- 2 feet above FIRM depth number
- Certification required
- Registered professional engineer or surveyor
- Enforced by
- City Engineer before final inspection
Summary
New construction and substantial improvements in Special Flood Hazard Areas must elevate the lowest floor at least 2 feet above the base flood elevation, per San Diego Municipal Code § 143.0146(c)(6), enforced by the City Engineer before final inspection approval.
New construction or substantial improvement of any structure shall have the lowest floor, including basement, elevated at least 2 feet above the base flood elevation. Upon completion of the development, the elevation of the lowest floor, including basement, shall be certified by a registered professional engineer or surveyor to be properly elevated. The certification shall be provided to the City Engineer before final inspection approval. The City Engineer reserves the right to require a preliminary certification before foundation inspection approval.
Ch. Art. Div. 14 3 1 43 San Diego Municipal Code Chapter 14: General Regulations (7-2026)
(7) New construction or substantial improvement of any structure in FIRM Zone AH or AO shall have the lowest floor, including basement, elevated above the highest adjacent grade at least 2 feet higher than the depth number specified on the FIRM, or at least 4 feet if no depth number is specified. Upon the completion of the structure the elevation of the lowest floor,
Full Breakdown
San Diego Municipal Code § 143.0146 governs all development in Special Flood Hazard Areas. Subsection (c)(6) requires new construction or substantial improvement of any structure to have the lowest floor, including basement, elevated at least 2 feet above the base flood elevation: a 2-foot freeboard above FEMA's minimum. The elevation must be certified by a registered professional engineer or surveyor before final inspection approval, and the City Engineer can require a preliminary certification before foundation inspection. Structures in FIRM Zone AH or AO must be elevated 2 feet above the FIRM-specified depth number, per subsection (c)(7).
Violations & Fines
Building without the required 2-foot freeboard elevation, or without engineer certification, blocks final inspection approval and bars occupancy. The City Engineer withholds sign-off until certification is provided and FEMA compliance is confirmed.
Frequently Asked Questions
How much freeboard does San Diego require above base flood elevation?
Who certifies the elevation meets the requirement?
Sources & Official References
Other rules in San Diego
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Flood Elevation Requirements in Nearby Cities
How other cities in San Diego County handle flood elevation requirements.