257 Castle Glen Rd
Walnut Creek 94595 · Unincorporated Contra Costa · Coordinates: 37.87312, -122.05946
Parcel & Assessor
- Lot size:
- 22,166 sq ft (0.51 ac)
- Assessor use:
- Single Family, 1 residence on 1 site, with or without
- Tax rate area:
- 98002
- Addresses on lot:
- 257 CASTLE GLEN RD
Zoning & Land Use
R-20 — Single Family Residential (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.
- 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 22,166 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 06013C0431F, effective June 16, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $625,000 – $845,000 · Status: Off market
HUD Small Area FMR (ZIP 94595) · FY 2026
Studio $2,200 · 1BR $2,450 · 2BR $2,990 · 3BR $3,820 · 4BR $4,530
Nearby Activity (½ mile radius, since —)
5 active or recent development projects (5 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 (Issued)On this parcel
Active in "Issued" for 19 mo (first record Mar 26, 2025) with no new permit activity recorded in 19 mo.
- New home (Entitled)370 ft SW
Active in "Entitled" for 13 mo (first record Oct 2, 2025) with no new permit activity recorded in 13 mo.
- New home (Entitled)380 ft SW
Active in "Entitled" for 6 yr (first record Oct 15, 2020) with no new permit activity recorded in 6 yr.
- New home (Issued)0.11 mi NW
Active in "Issued" for 4 yr (first record Oct 27, 2022) with no new permit activity recorded in 4 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: 1 entry (report years 2025).