San Jose, CA Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in San Jose, CA, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.
Key Facts
- Permit required
- Development permit before construction
- Administered by
- Deputy Director of Public Works
- Residential basements
- Prohibited below grade
- Elevation standard
- At/above base flood elevation
- Appeal window
- 10 calendar days
Summary
Any construction or development in a San Jose special flood hazard area needs a development permit from the floodplain administrator before work begins, including manufactured homes.
A development permit shall be obtained before any construction or other development, including manufactured homes, within any area of special flood hazard established in Section 17.08.510. Application for a development permit shall be made on forms furnished by the city of San Jose.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 5 Update 3).
Full Breakdown
San Jose Municipal Code Chapter 17.08 requires a development permit for any construction or other development, including manufactured homes, within an area of special flood hazard. The floodplain administrator (the deputy director of public works) reviews plans, elevation data, and floodproofing certifications before issuing a flood clearance tied to the building permit. New residential structures must have their lowest floor, including any basement, elevated to or above the base flood elevation; below-grade basements and below-grade parking garages are flatly prohibited in residential structures.
Violations & Fines
A structure or development lacking the required elevation certificate or other compliance documentation is presumed to be in violation until that documentation is provided; the floodplain administrator can require corrective work to remedy noncompliance.
Frequently Asked Questions
Do I need a permit to build in a San Jose flood zone?
Can I have a basement in a San Jose flood zone home?
Sources & Official References
Other rules in San Jose
California rules heatmap·Compare San Jose to another location·View the California environmental rules overview
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Flood Zones in Nearby Cities
How other cities in Santa Clara County handle flood zones.