139 Edgewood Ave
Mill Valley 94941 · Homestead · Unincorporated Marin · Coordinates: 37.90058, -122.55021
Executive Verdict · Public-Records Synthesis
Zoned R1-B1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $2,451,000 ($2,157,000–$2,745,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 18,905 sq ft lot. Local precedent is active with 3 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$129,180 contributory est.)
Public building records show issued construction/renovation work on this parcel (5 total permits, latest Jun 4, 2024).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Homestead
22 substantial renovation & housing permits over 24 months (20.7 per 1,000 parcels vs. 16.4 citywide baseline) (#2 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Homestead)
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 High 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
Pool / spa (89250): Pending in review for 5 yr (13.3× 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: New home (520 ft E, entitled). 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:
- 18,905 sq ft (0.43 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 139 EDGEWOOD AVE
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 lotLikely eligible
Zoned R1-B1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B1, a single-family residential zone. The lot is 18,905 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
- High 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 06041C0468F, 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: $2,157,000 – $2,745,000 · Status: Off market
HUD Small Area FMR (ZIP 94941) · FY 2026
Studio $2,730 · 1BR $3,270 · 2BR $3,960 · 3BR $5,060 · 4BR $5,240
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)520 ft E
In "Entitled" for 6.3 yr (since Aug 11, 2020), 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 deed-restricted affordable across 0 permits).
- New home (Entitled)0.37 mi E
In "Entitled" for 6.4 yr (since Jun 23, 2020), 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 deed-restricted affordable across 0 permits).
- MFR/Office Overlay (Entitled)0.41 mi NE
In "Entitled" for 13 mo (since Oct 13, 2025), exceeding the 292d median and 313d 90th percentile for new multifamily / condos / mixed-use permits in Unincorporated Marin (n=21). High-impact scale (5 housing units across 0 permits).
- Pool / spa (89250) (Applied)On this parcel
Pending in review for 5 yr (13.3× the 136d median) — slower than 90% of pool / spa permits in Unincorporated Marin (median 136d, 90th pct 393d, n=162).
Entity-resolved builders & contractors in ½ mile: Kerr Construction (2 on parcel, 2 in ½ mi · Addition (adds square footage)); Bay Area Energy Solutions (1 on parcel, 1 in ½ mi · Solar / battery storage); John Owens Services (1 on parcel, 1 in ½ mi · HVAC / heat pump); Owner Builder (29 in ½ mi · Remodel / interior alteration); Owner (15 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 176784 | General repair | Issued | Iss. Jun 4, 2024 | $10,000 | Glass Rail Replacement |
| 174327 | Addition (adds square footage) | Issued | Iss. Jun 20, 2023 | $175,000 | Addition; Remodel: Kitchen, [N] Pantry, Stairwell, & 4 Baths |
| 89250 | Pool / spa | Applied | App. Nov 30, 2021 | $125,000 | Pool; Retaining Walls |
| B24093 | HVAC / heat pump | Issued | Iss. Jun 15, 2021 | $40,472 | Install 2 AC Units Mitsubishi 36,000 Btu/hr ductless HP 240v Mitsubishi 48,000 heat pump with distribution box and 4 zon… |
| 164220 | Solar / battery storage | Issued | Iss. Feb 13, 2020 |