Mill Valley · new construction permits
Mill Valley new construction permits.
What it actually takes to permit a ground-up build in Mill Valley: jurisdiction, plan check, inspections, and the local overlays that change the path. Every link below points at an official City of Mill Valley Planning & Building Department resource.
Quick answer
New single-family permits in Mill Valley are issued by City of Mill Valley Planning & Building Department; California Title 24 Part 6 and CALGreen Part 11 apply statewide on top of any Mill Valley reach-code amendments.
Homeowner & investor takeaway
Budget a real hillside geotech program, expect story-pole noticing, and treat tree protection and defensible space as architectural inputs — not items added at permit submittal.
Local jurisdiction.
Permits are issued by City of Mill Valley Planning & Building Department (Marin County). Use the official portals below — do not rely on third-party permit aggregators.
- Building department: City of Mill Valley Planning & Building Department
- Permit portal: City of Mill Valley Planning & Building Department
- Planning: City of Mill Valley Planning & Building Department
- Zoning lookup: City of Mill Valley Planning & Building Department
- Municipal code: City of Mill Valley Planning & Building Department
Permit types typically involved.
Building permit
Required for a new dwelling unit, including structural, MEP, and envelope review.
Grading / drainage
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.
Sewer / utility
Municipal sewer service in developed Mill Valley parcels; verify lateral condition and any point-of-sale sewer compliance requirement before scoping. PG&E electric/gas; Marin Municipal Water District (MMWD) for water; Sewerage Agency of Southern Marin (SASM) and various sanitary districts for sewer.
Electrical / mechanical / plumbing
Often pulled with the building permit; some jurisdictions require separate sub-permits per trade.
Title 24 compliance
California Energy Commission Climate Zone 3. New single-family homes must comply with the current Title 24 Part 6 envelope, HVAC, hot-water, and rooftop solar-PV requirements.
CALGreen
CALGreen Part 11 mandatory measures (≥65% C&D waste diversion, water-efficient fixtures, indoor-air-quality measures) apply to all new homes. Mill Valley may layer reach-code or local green-building amendments — confirm the current adopted ordinance at intake.
Plan check process.
Plan check rigorous on Title 24, structural lateral, hillside grading, and fire-code compliance (Chapter 7A + defensible space).
Entitlement & planning review.
Most new SFRs in hillside zones require Design Review with the Planning Commission, plus story-pole noticing and arborist review.
Inspections.
City of Mill Valley Planning & Building Department schedules inspections through its permit portal; foundation, framing, rough trades, insulation, drywall, and final are the standard hold points for new SFRs in Mill Valley.
Local overlays & constraints.
Mill Valley uses R-1, RSP (Single Family-Planned), and Hillside (R-2H, etc.) districts; nearly all parcels carry slope, tree, and grading considerations.
Hillside. Hillside design review applies across most parcels; ridgeline protection and silhouette rules dictate roofline and massing.
Wildfire / WUI. Most Mill Valley parcels are in CAL FIRE Very-High Fire Hazard Severity Zone — Chapter 7A and Marin-specific defensible-space rules apply.
Seismic. Regional San Andreas system; CGS landslide hazard zones cover much of the steep terrain.
Common delay drivers.
Risk 1
Landslide-zone geotech triggering deep foundations
Risk 2
Story-pole opposition forcing redesign
Risk 3
Heritage Tree siting reducing footprint
Risk 4
Wet-season delays affecting LID compliance
Prepare before submittal.
- Confirm zoning, setbacks, height, and FAR for the parcel.
- Order soils / geotech early — many overlays require it before plan check.
- Complete Title 24 energy modeling and confirm CALGreen targets.
- Have a clear utility upgrade plan (sewer lateral, panel, gas) documented.
- Pre-assemble any overlay-specific studies (hillside, coastal, fire, flood).
This page is general information, not legal advice. Permit requirements change. Confirm the current process directly with City of Mill Valley Planning & Building Department.
Questions.
- Who issues new-home permits in Mill Valley?
- The City of Mill Valley Planning & Building Department issues permits; the Planning Commission handles hillside Design Review.
- Does Chapter 7A apply to my Mill Valley project?
- Almost certainly — most of Mill Valley is in VHFHSZ. Confirm on the CAL FIRE FHSZ map and CAL FIRE LRA designations.
- What is the Heritage Tree ordinance?
- Mill Valley protects designated heritage trees; an arborist survey is typically required and routinely shapes footprint and grading.
- Who provides water?
- Marin Municipal Water District (MMWD). Confirm service capacity and any current drought-related restrictions at intake.
- Does CALGreen apply?
- Yes, statewide. Confirm any Marin-specific reach-code amendments at intake.
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