Parcel Context · Public-Records Property BriefAPN 050-101-09
324 A Sheffield Ave
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.88311, -122.53151
Parcel & Assessor
- Lot size:
- 3,746 sq ft (0.09 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 324A SHEFFIELD AVE; 324 SHEFFIELD 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 3,746 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
- Not in a State-mapped fire hazard severity zone
- 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)
HUD Small Area FMR (ZIP 94941) · FY 2026
Studio $2,730 · 1BR $3,270 · 2BR $3,960 · 3BR $5,060 · 4BR $5,240
ACS 2020–2024 Median Gross Rent (Tamalpais):$2,994±$755 Source: ACS 2020–2024 5-year estimates. Geography: Tamalpais.
ACS 2020–2024 Median Gross Rent (ZIP 94941):$3,100±$331 Source: ACS 2020–2024 5-year estimates. Geography: Mill Valley.
Zillow Home Value Index (ZIP 94941, September 2026):$2,181,389
ACS 2020–2024 Median Home Value (Tamalpais):$1,805,000±$71,000 Source: ACS 2020–2024 5-year estimates. Geography: Tamalpais.
ACS 2020–2024 Median Home Value (ZIP 94941):
Permit & Project History on This Parcel (9 permits, 1 grouped projects)
Accessory dwelling unit at 324 Sheffield AveStage: Issued · 1 units · $80,000 declared valuation · Last record Sep 15, 2026
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 181649 | Accessory dwelling unit (new or conversion) | Issued | Iss. Sep 15, 2026 | $80,000 | Convert Unfinished Ground Floor To A D U To Be 324 (A) |
| 92543 | Demolition | Applied | App. Aug 26, 2024 | $30,000 | Demo 1st Floor Deck; Rebuild 2nd Floor Deck |
| B35709 | Solar / battery storage | Issued | Iss. Oct 9, 2023 | $17,440 | INSTALLATION OF ROOF MOUNTED PV SYSTEM - 5.22 KW (12 MODULES) WITH (N) 13KWH ENERGY STORAGE SYSTEM (N)100A LOAD CENTER |
| 91549 | Other | Applied | App. Oct 4, 2023 | $41,000 |