3918 Charles Ave
El Sobrante 94803 · Unincorporated Contra Costa · Coordinates: 37.96569, -122.30420
Parcel & Assessor
- Lot size:
- 5,305 sq ft (0.12 ac)
- Assessor use:
- Single Family, 1 residence on 1 site, with or without
- Tax rate area:
- 85004
- Addresses on lot:
- 3918 CHARLES AVE
Zoning & Land Use
R-6 — Single Family Residential (Unincorporated Contra Costa)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R-6 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R-6, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R-6, a single-family residential zone. The lot is 5,305 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 (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06013C0233G, effective March 21, 2017
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $611,000 – $827,000 · Status: Off market
HUD Small Area FMR (ZIP 94803) · FY 2026
Studio $2,020 · 1BR $2,240 · 2BR $2,740 · 3BR $3,500 · 4BR $4,150
Nearby Activity (½ mile radius, since November 2024)
8 active or recent development projects (8 housing units across completed, permitted, and pipeline stages) and 14 total building permits recorded within ½ mile.
- Additions & renovations2 permits
- Building systems8 permits
- Repairs1 permit
- Other3 permits
Developments Deserving Closer Investigation & Active Area Builders
- Balmore Court (Entitled)0.29 mi W
Active in "Entitled" for 5.9 yr (first record Dec 14, 2020) with no new permit activity recorded in 5.9 yr. High-impact scale (33 housing units across 0 permits).
- Balmore Court (Entitled)0.29 mi W
Active in "Entitled" for 7.2 yr (first record Aug 28, 2019) with no new permit activity recorded in 7.2 yr. High-impact scale (33 housing units across 0 permits).
- New home (Entitled)370 ft NE
Active in "Entitled" for 4.6 yr (first record Apr 12, 2022) with no new permit activity recorded in 4.6 yr.
- Accessory dwelling unit at 2587 Sheldon Dr Unit A (Issued)0.24 mi NE
Active in "Issued" for 5.5 yr (first record May 18, 2021) with no new permit activity recorded in 4.7 yr.
Permit & Project History on This Parcel (0 permits, 1 grouped projects)
No building permits recorded on this parcel in our dataset.
State HCD Housing Element APR records on this parcel: 4 entries (report years 2022, 2023, 2024, 2025).