31 Hill Ave
Woodacre 94973 · Woodacre · Unincorporated Marin · Coordinates: 38.01216, -122.63825
Executive Verdict · Public-Records Synthesis
Zoned RSP-0.5-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 $1,203,000 ($1,059,000–$1,347,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-0.5-SGV supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 52,969 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ 1 documented municipal building permit on file
On-parcel permit history is indexed through Sep 9, 2024, 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)
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: Accessory dwelling unit at 209 San Geronimo Valley Dr (0.46 mi W, 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 (~$14,285/yr at $1,203,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,190/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:
- 52,969 sq ft (1.22 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 31 HILL AVE
Zoning & Land Use
RSP-0.5-SGV — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RSP-0.5-SGV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RSP-0.5-SGV, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RSP-0.5-SGV, a single-family residential zone. The lot is 52,969 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: $1,059,000 – $1,347,000 · 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
- Accessory dwelling unit at 209 San Geronimo Valley Dr (Applied)0.46 mi W
In "Applied" for 6.3 yr (since Jul 28, 2020), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Demolition at 0 Sylvan Way (Applied)0.47 mi W
In "Applied" for 2.6 yr (since Apr 22, 2024), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
- Accessory dwelling unit at 156 Central Ave (Issued)0.19 mi W
Active in "Issued" for 3.5 yr (first record May 15, 2023) with no new permit activity recorded in 3.5 yr.
- Demolition at 90 Carson Rd (Issued)0.28 mi SW
Active in "Issued" for 4.8 yr (first record Jan 21, 2022) with no new permit activity recorded in 4.7 yr.
Entity-resolved builders & contractors in ½ mile: Donald J Calegari Enterprises (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer); Camello (13 in ½ mi · New single-family home); Owner (7 in ½ mi · Demolition); Owner Builder (7 in ½ mi · New garage / accessory structure); C Overaa And (1 in ½ mi · New garage / accessory structure).
Permit & Project History on This Parcel (1 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B39414 | Plumbing / water heater / sewer | Issued | Iss. Sep 9, 2024 | $2,000 | REPLACE 40 GAL NG WATER HEATER — Replace Plumbing Fixtures(s) |