Skip to main content
alpha dream

New construction · San Francisco

Do I need a soils report for new construction in San Francisco?

A geotechnical (soils) report is effectively required for new construction in San Francisco. San Francisco Department of Building Inspection (DBI) uses it to size the foundation, set drainage, and confirm compliance with California seismic provisions on the parcel.

What changes the answer in San Francisco.

Highly variable — bedrock in western neighborhoods, Bay Mud and engineered fill in SoMa/Mission Bay. Liquefaction risk significant in fill areas. San Andreas, Hayward, and San Gregorio fault systems regional; CGS EQ Zone App lists liquefaction zones in eastern neighborhoods (SoMa, Mission, Marina).

  • Highly variable — bedrock in western neighborhoods, Bay Mud and engineered fill in SoMa/Mission Bay. Liquefaction risk significant in fill areas.
  • San Andreas, Hayward, and San Gregorio fault systems regional; CGS EQ Zone App lists liquefaction zones in eastern neighborhoods (SoMa, Mission, Marina).
  • Many neighborhoods (Bernal, Twin Peaks, Diamond Heights) on significant slopes — shoring/retaining common.
  • SLR vulnerability mapped along eastern shoreline; FEMA SFHA in limited areas (Mission Creek, southeast bayfront).

Source-backed note

California Geological Survey publishes seismic-hazard and liquefaction maps; parcels inside designated zones require a site-specific geotechnical investigation under CBC §1803.

Reference: California Geological Survey — Seismic Hazard Zones — California Department of Conservation

Local authority: San Francisco Department of Building Inspection (DBI)

Get a San Francisco-specific answer for your parcel.

Send us the address and we'll respond with a feasibility note that cites San Francisco Department of Building Inspection (DBI) and the parcel's actual constraints — not a generic checklist.

Start a San Francisco consultationCall (818) 650-3197

Alpha Dream Construction — licensed California general contractor.

request a quote

Tell us what you’re building.

A few specifics — city, scope, budget, target date. We’ll come back with a one-page feasibility note within the week.

Phone or email — at least one so we can reply.

We use this to route your lead to the right studio. No spam, ever.

Made it this far?After hours · reply first thing tomorrow

Then you're serious. Let's put it on a clipboard.

  • 10-minute call with the foreman
  • We tell you what your build actually costs, today
  • No follow-up unless you ask

Free · Same-week scheduling

Contact form · 30 seconds

or call (818) 650-3197 →

No spam. We reply personally — usually within 3 hours.

Call