5520 Sobrante Ave
El Sobrante 94803 · Unincorporated Contra Costa · Coordinates: 37.98099, -122.28815
Parcel & Assessor
- Lot size:
- 9,475 sq ft (0.22 ac)
- Assessor use:
- Single Family, 1 residence on 1 site, with or without
- Tax rate area:
- 85013
- Addresses on lot:
- 5520 SOBRANTE AVE
Zoning & Land Use
R-10 — Single Family Residential (Unincorporated Contra Costa)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R-10 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R-10, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R-10, a single-family residential zone. The lot is 9,475 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
- Moderate 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 06013C0231G, 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: $640,000 – $866,000 · 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)
6 active or recent development projects (6 housing units across completed, permitted, and pipeline stages) and 19 total building permits recorded within ½ mile.
- Adds housing (ADU)1 permit (1 units)
- Additions & renovations1 permit
- Building systems14 permits
- Repairs1 permit
- Other2 permits
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)On this parcel
Active in "Entitled" for 3 yr (first record Nov 8, 2023) with no new permit activity recorded in 3 yr.
- 5 new homes (Entitled)0.25 mi W
Active in "Entitled" for 8.3 yr (first record Aug 6, 2018) with no new permit activity recorded in 8.3 yr. High-impact scale (5 housing units across 0 permits).
- New home (Entitled)0.1 mi SE
Active in "Entitled" for 6.2 yr (first record Aug 31, 2020) with no new permit activity recorded in 6.2 yr.
- New home (Entitled)0.16 mi S
Active in "Entitled" for 6.1 yr (first record Oct 9, 2020) with no new permit activity recorded in 6.1 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: 2 entries (report years 2023, 2024).