50 Hanken Dr
Kentfield 94904 · Kentfield · Unincorporated Marin · Coordinates: 37.95973, -122.54739
Executive Verdict · Public-Records Synthesis
Zoned R1-B3 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (local responsibility area) due diligence; benchmark value $2,492,000 ($2,193,000–$2,791,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B3 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 24,786 sq ft lot. Local precedent is active with 4 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$24,920 contributory est.)
Public building records show issued construction/renovation work on this parcel (6 total permits, latest Jun 4, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Kentfield
104 substantial renovation & housing permits over 24 months (41.3 per 1,000 parcels vs. 16.4 citywide baseline) (#7 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Kentfield)
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 (Local 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 Mar 24, 2025)
- ! Delayed or open permit activity on this parcel
Pool / spa (93194): Pending in review for 18 mo (4.0× the 136d median) — slower than 90% of pool / spa permits in Unincorporated Marin (median 136d, 90th pct 393d, n=162).
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: Accessory dwelling unit at 66 Hanken Dr (adu 66a) (230 ft 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)
Parcel & Assessor
- Lot size:
- 24,786 sq ft (0.57 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 50 HANKEN DR; 52 HANKEN DR
Zoning & Land Use
R1-B3 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B3 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B3, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B3, a single-family residential zone. The lot is 24,786 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 (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0458F, 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: $2,193,000 – $2,791,000 · Status: Off market
HUD Small Area FMR (ZIP 94904) · FY 2026
Studio $2,260 · 1BR $2,710 · 2BR $3,280 · 3BR $4,190 · 4BR $4,340
Developments Deserving Closer Investigation & Active Area Builders
- Pool / spa (93194) (Applied)On this parcel
Pending in review for 18 mo (4.0× the 136d median) — slower than 90% of pool / spa permits in Unincorporated Marin (median 136d, 90th pct 393d, n=162).
- Remodel / interior alteration (178449) (Issued)On this parcel
Issued after 2.4 yr (10.7× the 83d median) — slower than 90% of remodel / interior alteration permits in Unincorporated Marin (median 83d, 90th pct 266d, n=1,054).
- Accessory dwelling unit at 66 Hanken Dr (adu 66a) (Issued)230 ft S
Active in "Issued" for 3.1 yr (first record Sep 29, 2023) with no new permit activity recorded in 2.8 yr. High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- New home at 7 Cedar Ave (Issued)0.34 mi SW
Active in "Issued" for 7.7 yr (first record Mar 14, 2019) with no new permit activity recorded in 5.5 yr. High-impact scale (1 housing unit, $1,217,500 declared valuation across 2 permits).
Entity-resolved builders & contractors in ½ mile: Owner Builder (1 on parcel, 29 in ½ mi · Remodel / interior alteration); Am Construction (3 on parcel, 3 in ½ mi · Addition (adds square footage)); Tech Air (1 on parcel, 1 in ½ mi · HVAC / heat pump); Owner (33 in ½ mi · Remodel / interior alteration); Juan Calmell (6 in ½ mi · New garage / accessory structure).
Permit & Project History on This Parcel (6 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B42640 | HVAC / heat pump | Issued | Iss. Jun 4, 2025 | $12,000 | Install ductless mini split system — Mechanical Appliance |
| 93194 | Pool / spa | Applied | App. May 14, 2025 | $150,000 | Pool And Retaining Walls |
| 178449 | Remodel / interior alteration | Issued | Iss. Jan 15, 2025 | $15,000 | Add Bedroom And Bath Within Existing Footprint ***Appl Extended To 10/11/25 Nh |
| 159396 | New garage / accessory structure | Issued | Iss. Aug 22, 2018 | $179,000 | Det Garage & New Access Dwell Unit. Change Contr 4/25/19 Pd Under 159395 Extend To 8/22/21 T.D. 1/26/18 |
| 159395 | Addition (adds square footage) | Issued |