2328 Alameda Diablo
Diablo 94528 · Unincorporated Contra Costa · Coordinates: 37.84046, -121.94947
Parcel & Assessor
- Lot size:
- 29,345 sq ft (0.67 ac)
- Assessor use:
- Vacant, 1 site (includes PUD sites)
- Tax rate area:
- 66024
- Addresses on lot:
- 2328 ALAMEDA DIABLO
Zoning & Land Use
R-20 -UE — Single Family Residential · Urban Farm Animal Exclusion Combining District (Unincorporated Contra Costa)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R-20 (single-family residential): state law allows ADUs where homes are allowed. The assessor lists the lot as vacant: an ADU needs an existing or proposed main home.
- SB 9: two homes on the lotLikely eligible
Zoned R-20, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R-20, a single-family residential zone. The lot is 29,345 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 06013C0455G, 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: $924,000 – $1,250,000 · Status: Off market
HUD Small Area FMR (ZIP 94528) · FY 2026
Studio $2,140 · 1BR $2,440 · 2BR $2,970 · 3BR $3,830 · 4BR $4,530
Nearby Activity (½ mile radius, since —)
2 active or recent development projects (2 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)On this parcel
Active in "Entitled" for 4.1 yr (first record Oct 7, 2022) with no new permit activity recorded in 4.1 yr.
- New home (Entitled)On this parcel
Active in "Entitled" for 4.1 yr (first record Oct 7, 2022) with no new permit activity recorded in 4.1 yr.
- New home (Entitled)0.13 mi SE
Active in "Entitled" for 15 mo (first record Aug 1, 2025) with no new permit activity recorded in 15 mo.
- New home (Entitled)0.13 mi SE
Active in "Entitled" for 4.1 yr (first record Sep 12, 2022) with no new permit activity recorded in 4.1 yr.
Permit & Project History on This Parcel (0 permits, 2 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).