400 Oak Manor Dr
Fairfax 94930 · Unincorporated Fairfax · Unincorporated Marin · Coordinates: 38.00385, -122.59229
Executive Verdict · Public-Records Synthesis
Zoned RSP-0.1 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 $1,362,000 ($1,199,000–$1,525,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-0.1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 303,875 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$108,000 contributory est.)
Public building records show issued construction/renovation work on this parcel (7 total permits, latest Jun 15, 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 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
New garage / accessory structure (174839): Issued after 4.2 yr (9.3× the 164d median) — slower than 90% of new garage / accessory structure permits in Unincorporated Marin (median 164d, 90th pct 485d, n=356).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 2 slow or stalled nearby projects within ½ mile
Closest lead: New home at 40 De Burgh Dr (0.49 mi NE, 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:
- 303,875 sq ft (6.98 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 400 OAK MANOR DR
Zoning & Land Use
RSP-0.1 — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RSP-0.1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RSP-0.1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RSP-0.1, a single-family residential zone. The lot is 303,875 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 06041C0289D, 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: $1,199,000 – $1,525,000 · Status: Off market
HUD Small Area FMR (ZIP 94930) · FY 2026
Studio $2,230 · 1BR $2,680 · 2BR $3,240 · 3BR $4,140 · 4BR $4,290
Developments Deserving Closer Investigation & Active Area Builders
- New home at 40 De Burgh Dr (Applied)0.49 mi NE
In "Applied" for 9.3 yr (since Jul 31, 2017), 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, $1,800,000 declared valuation across 3 permits).
- New garage / accessory structure (174839) (Issued)On this parcel
Issued after 4.2 yr (9.3× the 164d median) — slower than 90% of new garage / accessory structure permits in Unincorporated Marin (median 164d, 90th pct 485d, n=356).
- New garage / accessory structure (91153) (Applied)On this parcel
Pending in review for 3.5 yr (7.7× the 164d median) — slower than 90% of new garage / accessory structure permits in Unincorporated Marin (median 164d, 90th pct 485d, n=356).
- Plumbing / water heater / sewer (166546) (Issued)On this parcel
Issued after 6 mo — slower than 90% of plumbing / water heater / sewer permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,211).
Entity-resolved builders & contractors in ½ mile: Jetton Const (2 on parcel, 2 in ½ mi · Plumbing / water heater / sewer); Oxbow Pool And Landscape Contractors (1 on parcel, 1 in ½ mi · New garage / accessory structure); Superior Roofing Solutions (1 on parcel, 1 in ½ mi · Roof replacement); Irvine Npi Electrical (1 on parcel, 1 in ½ mi · Electrical / panel); Owner Builder (11 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (7 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B47151 | Electrical / panel | Issued | Iss. Jun 15, 2026 | $6,000 | Service Upgrade |
| 174839 | New garage / accessory structure | Issued | Iss. Aug 25, 2023 | $450,000 | Above Ground Lap Pool & Spa; Equipment Enclosure ***Ext To 4/5/24.Nh/Lw |
| 91153 | New garage / accessory structure | Applied | App. May 25, 2023 | $55,000 | Pool Equipment Enclosure |
| 166546 | Plumbing / water heater / sewer | Issued | Iss. Dec 11, 2020 | $12,000 | Generator |
| 83737 | New garage / accessory structure | Applied | App. Jun 19, 2019 | $350,000 |