437 Montford Ave
Mill Valley 94941 · Homestead · Unincorporated Marin · Coordinates: 37.89867, -122.55061
Executive Verdict · Public-Records Synthesis
Zoned RMP-2.8 in Unincorporated Marin with likely ministerial ADU eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $2,266,000 ($1,994,000–$2,538,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RMP-2.8 allows residential use qualifying for ministerial ADU review under state law (3 ADU permits permitted within ¼ mile in 36 months).
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ 4 documented municipal building permits on file
On-parcel permit history is indexed through Dec 4, 2025, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home (0.17 mi NE, 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)
- ! Year 1 Prop 13 tax reset (~$26,509/yr at $2,266,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,209/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:
- 13,591 sq ft (0.31 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 437 MONTFORD AVE
Zoning & Land Use
RMP-2.8 — Residential Multiple Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RMP-2.8 (multifamily residential): state law allows ADUs where homes are allowed. On a multifamily lot the state allowance is different: ADUs in non-living space of the building, plus up to eight detached ADUs.
- SB 9: two homes on the lotUnlikely
Zoned RMP-2.8 (multifamily residential), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned RMP-2.8 (multifamily residential), not a single-family residential zone.
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: $1,994,000 – $2,538,000 · 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
Nearby Activity (½ mile radius, since November 2024)
13 active or recent development projects (11 housing units across completed, permitted, and pipeline stages) and 189 total building permits recorded within ½ mile.
- New construction5 permits
- Adds housing (ADU)5 permits (5 units)
- Demolition2 permits
- Additions & renovations16 permits
- Building systems122 permits
- Repairs11 permits
- Other28 permits
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)0.17 mi NE
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)0.41 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).
- New home at 420 Laverne Ave (Issued)0.1 mi SE
Active in "Issued" for 8.6 yr (first record Apr 23, 2018) with no new permit activity recorded in 3.8 yr. High-impact scale (1 housing unit, $1,100,000 declared valuation across 1 permit).
- Accessory dwelling unit at 408 Laverne Ave (adu 408a) (Issued)0.12 mi SE
Active in "Issued" for 2.3 yr (first record Jul 12, 2024) with no new permit activity recorded in 14 mo. High-impact scale (1 housing unit, $2,700,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: John Owens Services (2 on parcel, 2 in ½ mi · HVAC / heat pump); Americas Vinyl Exteriors (1 on parcel, 1 in ½ mi · Windows / doors / siding); Crandall Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Owner Builder (39 in ½ mi · Remodel / interior alteration); Owner (22 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B45016 | HVAC / heat pump | Issued | Iss. Dec 4, 2025 | $9,000 | Replace furnace a like in kind in same location. — Replace Mechanical Appliance |
| B43742 | Windows / doors / siding | Issued | Iss. Sep 4, 2025 | $31,500 | Replacing wood siding to James Hardie ship lap siding. Remove existing wood siding, install James Hardie ship lap siding… |
| B36684 | Roof replacement | Issued | Iss. Jan 12, 2024 | $6,945 | T/O 12 Sq comp shingle; re-roof with class A rated comp shingle; partial re-roof two front sections of house; SFD — ReRo… |
| B15315 | HVAC / heat pump | Issued | Iss. Jun 28, 2018 | $7,535 | replace furnace & less than 40 ft of duct work — Replace Ductwork, Mechanical Appliance |