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New construction · Berkeley

Do I need a soils report for new construction in Berkeley?

A geotechnical (soils) report is effectively required for new construction in Berkeley. City of Berkeley Permit Service Center — Building & Safety Division uses it to size the foundation, set drainage, and confirm compliance with California seismic provisions on the parcel.

What changes the answer in Berkeley.

Hill parcels sit on Franciscan bedrock or residual clay; flatland parcels include alluvium and (near the Bay) Bay Mud and engineered fill. The Hayward Fault Alquist-Priolo zone runs through the eastern hills — a primary design constraint for any hillside custom; CGS liquefaction zones cover parts of the flats near the Bay.

  • Hill parcels sit on Franciscan bedrock or residual clay; flatland parcels include alluvium and (near the Bay) Bay Mud and engineered fill.
  • The Hayward Fault Alquist-Priolo zone runs through the eastern hills — a primary design constraint for any hillside custom; CGS liquefaction zones cover parts of the flats near the Bay.
  • R-1H hillside zoning adds slope-based density limits, story-pole noticing, and stricter grading rules; portions of the upper hills are also in CAL FIRE VHFHSZ.

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: City of Berkeley Permit Service Center — Building & Safety Division

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