New construction · Mill Valley
Do I need a soils report for new construction in Mill Valley?
A geotechnical (soils) report is effectively required for new construction in Mill Valley. City of Mill Valley Planning & Building Department uses it to size the foundation, set drainage, and confirm compliance with California seismic provisions on the parcel.
What changes the answer in Mill Valley.
Franciscan complex bedrock with weathered/colluvial surface; landslide and creep hazard common — geotech required. Regional San Andreas system; CGS landslide hazard zones cover much of the steep terrain.
- Franciscan complex bedrock with weathered/colluvial surface; landslide and creep hazard common — geotech required.
- Regional San Andreas system; CGS landslide hazard zones cover much of the steep terrain.
- Hillside design review applies across most parcels; ridgeline protection and silhouette rules dictate roofline and massing.
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 Mill Valley Planning & Building Department
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