34 Rock Rd
Kentfield 94904 · Kentfield · Unincorporated Marin · Coordinates: 37.95344, -122.56043
Executive Verdict · Public-Records Synthesis
Zoned RSP-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 $2,630,000 ($2,314,000–$2,946,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 45,999 sq ft lot. Local precedent is active with 5 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$161,280 contributory est.)
Public building records show issued construction/renovation work on this parcel (6 total permits, latest Jul 24, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Kentfield
103 substantial renovation & housing permits over 24 months (40.9 per 1,000 parcels vs. 16.3 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 (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: Accessory dwelling unit at 432 Woodland Rd (0.25 mi SW, 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)
- ! Year 1 Prop 13 tax reset (~$30,695/yr at $2,630,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,558/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:
- 45,999 sq ft (1.06 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 34 ROCK RD
Zoning & Land Use
RSP-1 — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RSP-1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RSP-1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RSP-1, a single-family residential zone. The lot is 45,999 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 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: $2,314,000 – $2,946,000 · 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
Nearby Activity (½ mile radius, since November 2024)
20 active or recent development projects (18 housing units across completed, permitted, and pipeline stages) and 262 total building permits recorded within ½ mile.
- New construction16 permits (6 units)
- Adds housing (ADU)8 permits (8 units)
- Demolition7 permits
- Additions & renovations35 permits
- Building systems149 permits
- Repairs17 permits
- Other30 permits
Developments Deserving Closer Investigation & Active Area Builders
- Accessory dwelling unit at 432 Woodland Rd (Applied)0.25 mi SW
In "Applied" for 2.6 yr (since Apr 12, 2024), 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, $1,250,000 declared valuation across 1 permit).
- New home at 37 N Ridgewood Rd (Issued)520 ft SE
Active in "Issued" for 11.3 yr (first record Jul 16, 2015) with no new permit activity recorded in 11.1 yr. High-impact scale (1 housing unit, $1,475,000 declared valuation across 1 permit).
- New home at 75 Rock Rd (Issued)0.13 mi NE
Active in "Issued" for 2.2 yr (first record Aug 27, 2024) with no new permit activity recorded in 18 mo. High-impact scale (1 housing unit, $936,400 declared valuation across 1 permit).
- Accessory dwelling unit at 31 N Ridgewood Rd (adu 31a) (Issued)0.15 mi S
Active in "Issued" for 21 mo (first record Feb 28, 2025) with no new permit activity recorded in 16 mo. High-impact scale (1 housing unit, $750,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: Damner Construction (2 on parcel, 2 in ½ mi · Remodel / interior alteration); Divine Electric (2 on parcel, 2 in ½ mi · Electrical / panel); K And S Energy (1 on parcel, 1 in ½ mi · Solar / battery storage); Modern Method Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Owner Builder (31 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (6 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 179719 | Remodel / interior alteration | Issued | Iss. Jul 24, 2025 | $500,000 | Retroactive Permit For Remodel; Decks; Siding; Windows & Doors; (N) Outdoor Shower |
| B41630 | Windows / doors / siding | Issued | Iss. Mar 17, 2025 | $9,600 | Replace 8 windows and 1 wood exterior door. — Non-structural Door/Window Replacement |
| B41296 | Solar / battery storage | Issued | Iss. Feb 18, 2025 | $91,748 | Residential Roof Mount 10.12 kW-DC Solar PV and 40.8 kWh Exterior Battery Energy Storage System Installation |
| B40022 | Electrical / panel | Issued | Iss. Oct 31, 2024 | $1,029 | Replace 5 Exterior Outlets And add Covers Secure Outlet in Breakfast Nook — Replace Circuits / Outlets |
| B35281 | EV charger | Issued | Iss. Sep 5, 2023 | $8,883 | 100A to 200A Panel Upgrade 48A EV Charger on Pedestal — Service Upgrade, EV Charging Station |
| B34499 | Roof replacement | Issued | Iss. Jun 29, 2023 | $32,700 | At house & attached garage: T/O old T&G and install a 60mil TPO roof system. Cool roof compliant. Class A, 3800 sq ft — … |