55 Arroyo Rd
Lagunitas 94938 · Lagunitas · Unincorporated Marin · Coordinates: 38.01616, -122.69449
Executive Verdict · Public-Records Synthesis
Zoned RA-B4-SGV in Unincorporated Marin with likely ministerial ADU eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,134,000 ($998,000–$1,270,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RA-B4-SGV allows residential use qualifying for ministerial ADU review under state law (1 ADU permit permitted within ¼ mile in 36 months).
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ Documented permitted upgrades (+$13,680 contributory est.)
Public building records show issued construction/renovation work on this parcel (2 total permits, latest Aug 25, 2020).
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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home at 42 Arroyo Rd (490 ft E, issued). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
- ! Year 1 Prop 13 tax reset (~$13,491/yr at $1,134,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,124/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Parcel & Assessor
- Lot size:
- 22,477 sq ft (0.52 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 55 ARROYO RD
Zoning & Land Use
RA-B4-SGV — Residential Agriculture (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RA-B4-SGV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotCan't tell
Zoned RA-B4-SGV (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
- SB 9: split into two lotsCan't tell
Zoned RA-B4-SGV (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
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: $998,000 – $1,270,000 · Status: Off market
HUD Small Area FMR (ZIP 94938) · FY 2026
Studio $2,170 · 1BR $2,610 · 2BR $3,150 · 3BR $4,020 · 4BR $4,200
Developments Deserving Closer Investigation & Active Area Builders
- New home at 42 Arroyo Rd (Issued)490 ft E
Active in "Issued" for 12.3 yr (first record Aug 11, 2014) with no new permit activity recorded in 11.8 yr.
- Accessory dwelling unit at 7090 Sir Francis Drake Blvd (Issued)0.16 mi SW
Active in "Issued" for 9.4 yr (first record Jun 14, 2017) with no new permit activity recorded in 7.5 yr.
- Demolition at 6956 Sir Francis Drake Blvd (Issued)0.18 mi E
Active in "Issued" for 2.8 yr (first record Jan 10, 2024) with no new permit activity recorded in 2.7 yr.
- Accessory dwelling unit at 8 Morelos Ave (Issued)0.21 mi SE
Active in "Issued" for 6.1 yr (first record Oct 8, 2020) with no new permit activity recorded in 6.1 yr.
Entity-resolved builders & contractors in ½ mile: Norcal Home (1 on parcel, 1 in ½ mi · Solar / battery storage); Lowes Electric (1 on parcel, 1 in ½ mi · Electrical / panel); Owner Builder (10 in ½ mi · Accessory dwelling unit (new or conversion)); Owner (9 in ½ mi · Remodel / interior alteration); Zia Designs (2 in ½ mi · Demolition).
Permit & Project History on This Parcel (2 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 165519 | Solar / battery storage | Issued | Iss. Aug 25, 2020 | $70,000 | 10.72kw Photovoltaic |
| B13657 | Electrical / panel | Issued | Iss. Nov 2, 2017 | $3,000 | UPGRADE MAIN PANEL FROM 100A TO 125A — Service Upgrade |