401 Oceana Dr
Dillon Beach 94929 · Dillon Beach · Unincorporated Marin · Coordinates: 38.25435, -122.96381
Executive Verdict · Public-Records Synthesis
Zoned C-R1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,549,000 ($1,363,000–$1,735,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned C-R1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 17,990 sq ft lot. Local precedent is active with 1 ADU permit within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$5,944 contributory est.)
Public building records show issued construction/renovation work on this parcel (5 total permits, latest Nov 19, 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 Moderate 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
Electrical / panel (178348): Issued after 11 mo — slower than 90% of electrical / panel permits in Unincorporated Marin (median 0d, 90th pct 2d, n=3,020).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 4 slow or stalled nearby projects within ½ mile
Closest lead: New home at 34 Kona Ln (0.29 mi N, 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:
- 17,990 sq ft (0.41 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 401 OCEANA DR
Zoning & Land Use
C-R1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned C-R1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned C-R1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned C-R1, a single-family residential zone. The lot is 17,990 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
- Moderate 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 06041C0040E, effective August 15, 2017
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,363,000 – $1,735,000 · Status: Off market
HUD Small Area FMR (ZIP 94929) · FY 2026
Studio $2,050 · 1BR $2,510 · 2BR $2,990 · 3BR $4,010 · 4BR $4,280
Developments Deserving Closer Investigation & Active Area Builders
- New home at 34 Kona Ln (Applied)0.29 mi N
In "Applied" for 3.9 yr (since Dec 27, 2022), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121). High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- Electrical / panel (178348) (Issued)On this parcel
Issued after 11 mo — slower than 90% of electrical / panel permits in Unincorporated Marin (median 0d, 90th pct 2d, n=3,020).
- Other (172361) (Issued)On this parcel
Issued after 7 mo — slower than 90% of other permits in Unincorporated Marin (median 0d, 90th pct 71d, n=1,562).
- New home at 429 Oceana Dr (Issued)330 ft NE
Active in "Issued" for 4 yr (first record Nov 29, 2022) with no new permit activity recorded in 2.3 yr. High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: Owner Builder (3 on parcel, 24 in ½ mi · Remodel / interior alteration); Capstone Roofing (1 on parcel, 1 in ½ mi · Roof replacement); North Bay Solar Electric (1 on parcel, 1 in ½ mi · Solar / battery storage); Owner (11 in ½ mi · New garage / accessory structure); Roseberry Construction (5 in ½ mi · New garage / accessory structure).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 180533 | General repair | Issued | Iss. Nov 19, 2025 | $10,000 | Driveway & Turnaround Retaining Walls |
| B41882 | Roof replacement | Issued | Iss. Apr 3, 2025 | $21,650 | Remove existing roof. Install with new Lifetime Class A composition shingles. — ReRoofing |
| 178348 | Electrical / panel | Issued | Iss. Dec 20, 2024 | $91,000 | New Deck & Stairs, Structural Door, Electrical Work-Minor; (N) Driveway & Turnaround |
| 172361 | Other | Issued | Iss. Sep 20, 2022 | $19,000 | Deck & 6-Ft Fence |
| 156694 | Solar / battery storage | Issued | Iss. Oct 5, 2017 |