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New construction · Los Angeles

Do I need a soils report for new construction in Los Angeles?

A geotechnical (soils) report is effectively required for new construction in Los Angeles. Los Angeles Department of Building & Safety (LADBS) uses it to size the foundation, set drainage, and confirm compliance with California seismic provisions on the parcel.

What changes the answer in Los Angeles.

Soils range from competent alluvium in the basin to expansive clays in the foothills and engineered fill in older hillside cuts; geotech reports are standard for any custom home. Multiple active fault zones cross the city (Hollywood, Newport-Inglewood, Santa Monica). CGS EQ Zone App should be checked for Alquist-Priolo and liquefaction zones before foundation design.

  • Soils range from competent alluvium in the basin to expansive clays in the foothills and engineered fill in older hillside cuts; geotech reports are standard for any custom home.
  • Multiple active fault zones cross the city (Hollywood, Newport-Inglewood, Santa Monica). CGS EQ Zone App should be checked for Alquist-Priolo and liquefaction zones before foundation design.
  • LA's Hillside Ordinance applies to roughly 17% of parcels and adds slope-band FAR caps, retaining-wall height limits, and stricter export limits.
  • Limited FEMA Special Flood Hazard Areas in the basin; most flood risk is localized to LA River–adjacent parcels and a few coastal flats.

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: Los Angeles Department of Building & Safety (LADBS)

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