508 Vendola Dr
San Rafael 94903 · Santa Venetia · Unincorporated Marin · Coordinates: 38.01243, -122.51878
Executive Verdict · Public-Records Synthesis
Zoned R1-B1 in Unincorporated Marin with likely ministerial ADU eligibility and mapped FEMA AE flood due diligence; benchmark value $1,169,000 ($1,029,000–$1,309,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone R1-B1 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
- ✓ 5 documented municipal building permits on file
On-parcel permit history is indexed through Jul 20, 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
- ! FEMA Special Flood Hazard Area (AE, all of the lot of lot)
Zone AE: 1% annual chance flood (Special Flood Hazard Area) overlaps this parcel. Expect mandatory flood insurance for federally backed loans and floodplain elevation/mitigation rules for new units or SB 9 applications.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home at 16 Crestview Way (0.26 mi S, 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 (~$13,894/yr at $1,169,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,158/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:
- 6,098 sq ft (0.14 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 508 VENDOLA DR
Zoning & Land Use
R1-B1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotPossible, with conditions
Zoned R1-B1, a single-family residential zone. FEMA Special Flood Hazard Area (Zone AE) covers all of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
- SB 9: split into two lotsPossible, with conditions
Zoned R1-B1, a single-family residential zone. The lot is 6,098 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original. FEMA Special Flood Hazard Area (Zone AE) covers all of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone AE: 1% annual chance flood (Special Flood Hazard Area) (all of the lot) · FIRM panel 06041C0294E, effective March 16, 2016
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,029,000 – $1,309,000 · Status: Off market
HUD Small Area FMR (ZIP 94903) · FY 2026
Studio $2,880 · 1BR $3,450 · 2BR $4,180 · 3BR $5,340 · 4BR $5,530
Developments Deserving Closer Investigation & Active Area Builders
- New home at 16 Crestview Way (Issued)0.26 mi S
Active in "Issued" for 2.5 yr (first record May 20, 2024) with no new permit activity recorded in 15 mo. High-impact scale (1 housing unit, $770,000 declared valuation across 1 permit).
- Accessory dwelling unit at 106 Mabry Way (Applied)0.19 mi SW
In "Applied" for 3.1 yr (since Sep 28, 2023), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Accessory dwelling unit at 120 Mabry Way (Applied)0.19 mi SW
In "Applied" for 3.1 yr (since Sep 21, 2023), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Accessory dwelling unit at 798 Hacienda Way (Applied)0.3 mi NE
In "Applied" for 11.1 yr (since Oct 5, 2015), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
Entity-resolved builders & contractors in ½ mile: High Definition Solar (2 on parcel, 2 in ½ mi · Solar / battery storage); Ramon Garcia Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Fast Water Heater (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer); Ernest Ongaro And Sons (1 on parcel, 1 in ½ mi · HVAC / heat pump); Owner Builder (40 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B47562 | Roof replacement | Issued | Iss. Jul 20, 2026 | $13,600 | ReRoofing |
| B47514 | Other | Issued | Iss. Jul 16, 2026 | $3,600 | — |
| B46925 | Plumbing / water heater / sewer | Issued | Iss. May 26, 2026 | $4,291 | Replace Plumbing Fixtures(s) |
| B24118 | HVAC / heat pump | Issued | Iss. Dec 3, 2020 | $4,000 | replace failed furnace with new furnace — Replace Mechanical Appliance |
| 144085 | Solar / battery storage | Issued | Iss. Sep 10, 2014 | $16,000 | 1.53 Kw Roof Mounted Photovoltaic - Express |