63 Madrone Ave
Woodacre 94973 · Woodacre · Unincorporated Marin · Coordinates: 38.00397, -122.64091
Executive Verdict · Public-Records Synthesis
Zoned R1-B3-SGV 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 $1,226,000 ($1,079,000–$1,373,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B3-SGV supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 8,189 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$120,000 contributory est.)
Public building records show issued construction/renovation work on this parcel (8 total permits, latest Mar 3, 2022).
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 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
Remodel / interior alteration (89438): Pending in review for 4.8 yr (21.1× the 83d median) — slower than 90% of remodel / interior alteration permits in Unincorporated Marin (median 83d, 90th pct 266d, n=1,054).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 3 slow or stalled nearby projects within ½ mile
Closest lead: New home at 15 Edgewood Dr (0.12 mi SE, 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:
- 8,189 sq ft (0.19 ac)
- Assessor use:
- Multiple-Resid. - Improved
- Addresses on lot:
- 63 MADRONE AVE
Zoning & Land Use
R1-B3-SGV — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B3-SGV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B3-SGV, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B3-SGV, a single-family residential zone. The lot is 8,189 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 06041C0275D, 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: $1,079,000 – $1,373,000 · Status: Off market
HUD Small Area FMR (ZIP 94973) · FY 2026
Studio $2,080 · 1BR $2,510 · 2BR $3,020 · 3BR $3,860 · 4BR $4,000
Developments Deserving Closer Investigation & Active Area Builders
- Remodel / interior alteration (89438) (Applied)On this parcel
Pending in review for 4.8 yr (21.1× the 83d median) — slower than 90% of remodel / interior alteration permits in Unincorporated Marin (median 83d, 90th pct 266d, n=1,054).
- New home at 15 Edgewood Dr (Applied)0.12 mi SE
In "Applied" for 6.1 yr (since Oct 22, 2020), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- General repair (170802) (Issued)On this parcel
Issued after 7 mo (2.5× the 83d median) — above the 75th percentile for general repair permits in Unincorporated Marin (median 83d, 75th pct 181d, n=693).
- Remodel / interior alteration (169115) (Issued)On this parcel
Issued after 7 mo (2.4× the 83d median) — above the 75th percentile for remodel / interior alteration permits in Unincorporated Marin (median 83d, 75th pct 148d, n=1,054).
Entity-resolved builders & contractors in ½ mile: Crafted Earth (2 on parcel, 2 in ½ mi · General repair); Bigham Services (2 on parcel, 2 in ½ mi · HVAC / heat pump); Aileron Builders (1 on parcel, 1 in ½ mi · Windows / doors / siding); Jiopbjk (1 on parcel, 1 in ½ mi · HVAC / heat pump); Tesla Energy (1 on parcel, 1 in ½ mi · Solar / battery storage).
Permit & Project History on This Parcel (8 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 170802 | General repair | Issued | Iss. Mar 3, 2022 | $40,000 | Rep/Repl Ret Wall (Portion Of) |
| 89438 | Remodel / interior alteration | Applied | App. Jan 24, 2022 | $150,000 | Relocate Stair; Remodel To Add Rec Room, Office And Bath To Lower Floor M C F D |
| 169115 | Remodel / interior alteration | Issued | Iss. Aug 17, 2021 | $300,000 | Struct. Inter Remodel |
| B23957 | HVAC / heat pump | Issued | Iss. Oct 23, 2020 | $12,203 | AC SLIM LINE ADD ON W/ COIL — Mechanical Appliance |
| B17835 | HVAC / heat pump | Issued | Iss. May 23, 2019 | $22,000 |