New construction · Mill Valley
How does hillside zoning affect new construction in Mill Valley?
Hillside parcels in Mill Valley carry slope-based limits on FAR, retaining walls, grading export, and access. Hillside design review applies across most parcels; ridgeline protection and silhouette rules dictate roofline and massing.
What changes the answer in Mill Valley.
Hillside design review applies across most parcels; ridgeline protection and silhouette rules dictate roofline and massing. Grading thresholds and Low Impact Development (LID) stormwater requirements apply per City of Mill Valley Planning & Building Department; sloped parcels require geotech and an erosion-control plan. Site access in Mill Valley can require temporary street-use or encroachment permits depending on street width, on-street parking restrictions, and proximity to schools or transit corridors.
- Hillside design review applies across most parcels; ridgeline protection and silhouette rules dictate roofline and massing.
- Grading thresholds and Low Impact Development (LID) stormwater requirements apply per City of Mill Valley Planning & Building Department; sloped parcels require geotech and an erosion-control plan.
- Site access in Mill Valley can require temporary street-use or encroachment permits depending on street width, on-street parking restrictions, and proximity to schools or transit corridors.
- Franciscan complex bedrock with weathered/colluvial surface; landslide and creep hazard common — geotech required.
Source-backed note
City of Mill Valley Planning & Building Department applies the local hillside ordinance at plan check; a geotechnical report and grading plan are typically required.
Local authority: City of Mill Valley Planning & Building Department
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