Is My San Francisco Property in a Flood Zone?
Data version: Q2 2026 · Last updated 2026-05-13
Buildability City Score™: C (Bottom 25%) · Median permit time: 186 days
TL;DR. Check the FEMA flood zone for any San Francisco address in about 20 seconds. Buildability™ pulls the latest FEMA flood maps and returns the exact zone designation (X, A, AE, V, VE), whether flood insurance is likely required, and how the zone affects your Buildability Score™. Free for your first check.
Flood zones in San Francisco
San Francisco properties fall across several FEMA flood zones. Zone X means minimal risk — no insurance required. Zone A and AE are Special Flood Hazard Areas where most lenders require flood insurance and elevated foundations may apply. Zone V and VE are coastal high-velocity zones with the strictest building codes and the highest insurance costs. Buildability™ returns the exact zone for your specific San Francisco parcel, not a street-level generalization.
Why this matters
Building in a San Francisco flood zone triggers additional requirements: elevated foundation (often 1+ foot above Base Flood Elevation), flood vents, breakaway walls in V zones, and higher material costs. Budget 8–15% more for construction in AE/V zones versus X zones. Buildability™ flags the zone so your pro-forma is based on reality.
How Buildability™ checks your San Francisco flood zone
Enter any San Francisco address. Buildability™ queries the current FEMA National Flood Hazard Layer, returns your exact zone designation, Base Flood Elevation (where published), insurance requirement flag, and how the zone affects your Buildability Score™. If the zone is AE or V, we also flag the likely elevation requirement and estimated insurance cost impact. Free for your first check.
Help us keep this accurate
Buildability™ translates San Francisco's flood zone rules in plain language. Rules change and overlays are sometimes missed — if you spot an error on this page, email team@buildability.us with the URL and what's off. We verify with the San Francisco planning department and update within 48 hours of a confirmed correction. San Francisco planning staff: the same email works if you'd like to flag corrections or set up a direct verification channel.
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