820 Marin Dr
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.87531, -122.54262
Parcel & Assessor
- Lot size:
- 14,288 sq ft (0.33 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 820 MARIN DR
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 14,288 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: $2,021,000 – $2,573,000 · 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
- Demolition at 820 Marin Dr (Applied)On this parcel
Active in "Applied" for 7.8 yr (first record Jan 23, 2019) with no new permit activity recorded in 7.8 yr.
- New home at 808 Spring Dr (Issued)290 ft NW
Active in "Issued" for 4.9 yr (first record Dec 13, 2021) with no new permit activity recorded in 4.7 yr. High-impact scale (1 housing unit, $850,000 declared valuation across 1 permit).
- New home at 812 Spring Dr (Issued)380 ft NW
Active in "Issued" for 4.1 yr (first record Sep 19, 2022) with no new permit activity recorded in 3.2 yr. High-impact scale (1 housing unit, $1,006,000 declared valuation across 1 permit).
- New home at 746 Alta Vista Rd (Issued)420 ft N
Active in "Issued" for 3.3 yr (first record Jul 19, 2023) with no new permit activity recorded in 2.2 yr. High-impact scale (1 housing unit, $1,183,700 declared valuation across 2 permits).
Permit & Project History on This Parcel (6 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 180738 | Electrical / panel | Issued | Iss. Dec 17, 2025 | $7,500 | Legalize Deck Around Accessory Structure; Electrical In Shed - B W O P |
| B39750 | Electrical / panel | Issued | Iss. Oct 11, 2024 | $1,000 | New Circuits and/or Outlets to outdoor shed — New Circuits / Outlets |
| 174843 | General repair | Issued | Iss. Aug 28, 2023 | $45,000 | Drive Way Retaining Wall |
| 163840 | Addition (adds square footage) | Issued | Iss. Jan 7, 2020 | $150,000 | Struct. Rmd, N/Roof, Addtn, Stairs & Deck ***Bwop T.D. 6/3/19 |