330 Horseshoe Hill Rd
Bolinas 94924 · Bolinas · Unincorporated Marin · Coordinates: 37.92829, -122.69910
Executive Verdict · Public-Records Synthesis
Zoned C-ARP-5 in Unincorporated Marin and mapped CAL FIRE high fire hazard severity zone (state responsibility area) / Alquist-Priolo fault due diligence; benchmark value $2,034,000 ($1,790,000–$2,278,000).
Upsides & Opportunities
- ✓ Documented permitted upgrades (+$65,730 contributory est.)
Public building records show issued construction/renovation work on this parcel (3 total permits, latest Jul 2, 2025).
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)
- ! Alquist-Priolo Earthquake Fault Zone (all of the lot of lot)
Intersects a State-mapped surface fault rupture zone. Adding habitable structures or subdividing typically requires a site-specific geologic fault investigation.
Source: California Geological Survey Alquist-Priolo Zones
- ! Delayed or open permit activity on this parcel
Solar / battery storage (179543): Issued after 3 mo — slower than 90% of solar / battery storage permits in Unincorporated Marin (median 0d, 90th pct 2d, n=2,977).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
Parcel & Assessor
- Lot size:
- 221,372 sq ft (5.08 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 330 HORSESHOE HILL RD
Zoning & Land Use
C-ARP-5 — Agriculture Residential Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADUCan't tell
Zoned C-ARP-5 (agricultural): ADUs are allowed if the zone allows a home, which depends on the zone's rules.
- SB 9: two homes on the lotUnlikely
Zoned C-ARP-5 (agricultural), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned C-ARP-5 (agricultural), not a single-family residential zone.
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 06041C0440E, effective August 15, 2017
- CGS Alquist-Priolo Earthquake Fault Zone
- Alquist-Priolo Earthquake Fault Zone (Bolinas quadrangle) (all of the lot)
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,790,000 – $2,278,000 · Status: Off market
HUD Small Area FMR (ZIP 94924) · FY 2026
Studio $2,050 · 1BR $2,510 · 2BR $2,990 · 3BR $3,730 · 4BR $3,960
Developments Deserving Closer Investigation & Active Area Builders
- Solar / battery storage (179543) (Issued)On this parcel
Issued after 3 mo — slower than 90% of solar / battery storage permits in Unincorporated Marin (median 0d, 90th pct 2d, n=2,977).
- New garage / accessory structure (165691) (Issued)On this parcel
Issued after 21 mo (3.9× the 164d median) — slower than 90% of new garage / accessory structure permits in Unincorporated Marin (median 164d, 90th pct 485d, n=356).
- Addition (adds square footage) (165690) (Issued)On this parcel
Issued after 21 mo (4.0× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
- New home at 75 Horseshoe Hill Rd (Issued)0.46 mi S
Active in "Issued" for 2.5 yr (first record May 30, 2024) with no new permit activity recorded in 2.2 yr.
Entity-resolved builders & contractors in ½ mile: Rj Heffelfinger Construction (2 on parcel, 3 in ½ mi · Remodel / interior alteration); Greenlief Energy (1 on parcel, 1 in ½ mi · Solar / battery storage); Owner Builder (5 in ½ mi · Accessory dwelling unit (new or conversion)); Precision Build (5 in ½ mi · New garage / accessory structure); Seegert Construction (4 in ½ mi · New garage / accessory structure).
Permit & Project History on This Parcel (3 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 179543 | Solar / battery storage | Issued | Iss. Jul 2, 2025 | $83,740 | 10.32kw Ground Mt. Solar 24 Panels On A Iron Ridge Ground Mount Racking System, 30kw In 2 Franklin Battery Storage Syste… |
| 165691 | New garage / accessory structure | Issued | Iss. Sep 10, 2020 | $10,000 | Sauna; Garden Storage; Plbg For B B Q; Elect For Portable Spa T.D. 11/11/19 |
| 165690 | Addition (adds square footage) | Issued | Iss. Sep 10, 2020 | $85,000 | Addn; Deck; Wndws; Skylites; Ext Sconces T.D. 11/11/19 |