430 San Geronimo Valley Dr
San Geronimo 94963 · San Geronimo Village · Unincorporated Marin · Coordinates: 38.01176, -122.66058
Executive Verdict · Public-Records Synthesis
Zoned R1-B4-SGV in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,380,000 ($1,214,000–$1,546,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B4-SGV supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 64,033 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ 6 documented municipal building permits on file
On-parcel permit history is indexed through Sep 9, 2026, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
Watchouts & Due Diligence
- ! Mapped flood awareness zone (Zone X: minimal flood hazard)
all of the lot of the parcel intersects Zone X: minimal flood hazard. Outside mandatory federal SFHA insurance rules, but check local drainage and finished-floor requirements.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! CAL FIRE High Fire Hazard Severity Zone (State Responsibility Area) (all of the lot of lot)
Located in a mapped Fire Hazard Severity Zone. Expect Chapter 7A ignition-resistant building standards, defensible-space inspections, and stricter property insurance underwriting.
Source: CAL FIRE FHSZ (map Apr 1, 2024)
- ! Delayed or open permit activity on this parcel
Plumbing / water heater / sewer (B25139): Issued after 2 mo — slower than 90% of plumbing / water heater / sewer permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,211).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 5 slow or stalled nearby projects within ½ mile
Closest lead: Demolition at 16 Meadow View Ln (0.29 mi SE, applied). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
Parcel & Assessor
- Lot size:
- 64,033 sq ft (1.47 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 430 SAN GERONIMO VALLEY DR
Zoning & Land Use
R1-B4-SGV — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B4-SGV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B4-SGV, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B4-SGV, a single-family residential zone. The lot is 64,033 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- High Fire Hazard Severity Zone (State Responsibility Area) (all of the lot, map Apr 1, 2024)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0275D, effective May 4, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,214,000 – $1,546,000 · Status: Off market
HUD Small Area FMR (ZIP 94963) · FY 2026
Studio $2,500 · 1BR $3,000 · 2BR $3,630 · 3BR $4,630 · 4BR $4,800
Developments Deserving Closer Investigation & Active Area Builders
- Plumbing / water heater / sewer (B25139) (Issued)On this parcel
Issued after 2 mo — slower than 90% of plumbing / water heater / sewer permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,211).
- Demolition at 16 Meadow View Ln (Applied)0.29 mi SE
In "Applied" for 8.5 yr (since May 29, 2018), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
- New home at 16 Meadow View Ln (Issued)0.29 mi SE
Active in "Issued" for 17.9 yr (first record Dec 23, 2008) with no new permit activity recorded in 12.5 yr.
- New home at 18 Meadow View Ln (Issued)0.29 mi SE
Active in "Issued" for 17.9 yr (first record Dec 23, 2008) with no new permit activity recorded in 12.5 yr.
Entity-resolved builders & contractors in ½ mile: Jemico (2 on parcel, 2 in ½ mi · Windows / doors / siding); Red Mountain Heating And Air (1 on parcel, 1 in ½ mi · HVAC / heat pump); Tesla Energy (1 on parcel, 1 in ½ mi · Solar / battery storage); Bravo Restoration (1 on parcel, 1 in ½ mi · General repair); Peter Levi Plumbing (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer).
Permit & Project History on This Parcel (6 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B48268 | Windows / doors / siding | Issued | Iss. Sep 9, 2026 | $12,710 | Non-structural Door/Window Replacement |
| B41922 | Windows / doors / siding | Issued | Iss. Apr 7, 2025 | $118,284 | Replace 21 retrofit windows and 3 entry doors — Non-structural Door/Window Replacement |
| B35508 | HVAC / heat pump | Issued | Iss. Sep 25, 2023 | $36,000 | Replacement of baseboard heating and AC Install new HP ductless mini split — Replace Mechanical Appliance |
| B25139 | Plumbing / water heater / sewer | Issued | Iss. May 10, 2021 | $4,518 | REPLACE TRADITIONAL 50 GALLON GAS WATER HEATER. — Replace Plumbing Fixtures(s) |
| 157884 | General repair | Issued |