155 A Horseshoe Hill Rd
Bolinas 94924 · Bolinas · Unincorporated Marin · Coordinates: 37.92427, -122.69805
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 $2,425,000 ($2,134,000–$2,716,000).
Upsides & Opportunities
- ✓ Documented permitted upgrades (+$232,500 contributory est.)
Public building records show issued construction/renovation work on this parcel (11 total permits, latest Sep 4, 2026).
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
Remodel / interior alteration (180938): Issued after 14 mo (5.2× the 83d median) — slower than 90% of remodel / interior alteration permits in Unincorporated Marin (median 83d, 90th pct 266d, n=1,054).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
Parcel & Assessor
- Lot size:
- 85,683 sq ft (1.97 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 155A HORSESHOE HILL RD; 155 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: $2,134,000 – $2,716,000 · 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
- Remodel / interior alteration (180938) (Issued)On this parcel
Issued after 14 mo (5.2× the 83d median) — slower than 90% of remodel / interior alteration permits in Unincorporated Marin (median 83d, 90th pct 266d, n=1,054).
- Roof replacement (180386) (Issued)On this parcel
Issued after 2 mo — slower than 90% of roof replacement permits in Unincorporated Marin (median 0d, 90th pct 0d, n=3,663).
- Demolition (181666) (Issued)On this parcel
Issued after 4 mo (2.4× the 55d median) — above the 75th percentile for demolition permits in Unincorporated Marin (median 55d, 75th pct 106d, n=130).
- Remodel / interior alteration (181662) (Issued)On this parcel
Issued after 5 mo (1.8× the 83d median) — above the 75th percentile for remodel / interior alteration permits in Unincorporated Marin (median 83d, 75th pct 148d, n=1,054).
Entity-resolved builders & contractors in ½ mile: Owner Builder (2 on parcel, 6 in ½ mi · Accessory dwelling unit (new or conversion)); Precision Build (5 on parcel, 5 in ½ mi · New garage / accessory structure); Alternative Roofing Solutions (1 on parcel, 1 in ½ mi · Roof replacement); Seegert Construction (4 in ½ mi · New garage / accessory structure); Rj Heffelfinger Construction (3 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (11 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 94508 | General repair | Applied | App. Sep 4, 2026 | — | New Foundation Under Entire A D U. Related To Permit 181662 |
| 94426 | Pool / spa | Applied | App. Jul 31, 2026 | $145,000 | New In-Ground Pool And Spa With Cover. |
| 181666 | Demolition | Issued | Iss. May 12, 2026 | $50,000 | Demo 4 Sheds, Accessory Structure, Water Tank, Fence |
| 181665 | New garage / accessory structure | Issued | Iss. May 12, 2026 | $200,000 | Unconditioned Water Service Shed; Covered Porch; Generator; Water Tank |
| 181664 | New garage / accessory structure | Issued | Iss. May 12, 2026 |