18888 Walnut Rd is a 1,512 square foot house on a 0.29 acre lot with 4 bedrooms and 2 bathrooms. - it last sold on March 09, 1979 for $87,000. Based on Redfin's Castro Valley data, we estimate the home's value is $1,161,914.
Single-familyProperty Type
1955Year Built
0.29 acresLot Size
$768Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$1,161,914
$1.1M since sold in March 1979$23K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 4.6% lower than the average sale price ($1.22M) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
R1
Single-Family Residence Districts
Single-family residence districts, hereinafter designated as R-1 districts, are established to provide for and protect established neighborhoods of one-family dwellings, and to provide space in suitable locations for additional development of this kind, together with appropriate community facilities and allowance for restricted interim cultivation of the soil compatible with such low-density residential development.
Permitted uses
Include but are not limited to:
Housing-Single unit
Agriculture-Cropland
Agriculture-Grove / orchard
Oct 10, 2025 • Active
Building
Install a roof-mounted solar photovoltaic system and an energy storage system with batteries on a residential building.
Battery
Electrical
Solar
Mar 7, 2011 • Final
Building
Replace the water supply line from the meter to the house.
Plumbing
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 7
Exterior
Exterior Information
Building Style Type: Rectangular Design
Construction Type: Wood
Building Construction Quality: Average
Property Information
Subdivision Name: CASTRO VLY ORCHARD
Living Sq. Ft: 1,512
Building Sq. Ft: 1,512
# of Units: 1
# of Stories: 1
Parking & Garage Information
# of Parking Spaces: 1
Parking Type: Carport
Garage / Carport Type: Carport
Lot Information
# of Buildings: 1
Land Sq. Ft: 12,765
Legal Lot Number: 15
Municipality Name: CASTRO VALLEY UNINCORP
Acres: 0.293
County Use Description: SINGLE FAMILY RESIDENTIAL HOME
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 1,512
Stories: 1.0
Lot Size: 0.29 acres
Style: Single Family Residential
Year Built: 1955
Year Renovated: 1956
County: Alameda County
APN: 084D116801600
Home facts updated by county records on Jul 27, 2026
Around this home
Schools
Chabot Elementary School
Public K-5 • Assigned • 0.3mi
9/10
Creekside Middle School
Public 6-8 • Assigned • 1.8mi
10/10
Castro Valley High School
Public 9-12 • Assigned • 0.8mi
9/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Local insights from Redfin agents
Castro Valley's late-summer market shows a clear split. While median prices hold near $1.2M, increased inventory gives buyers leverage on older properties. However, immaculate homes still go pending in under 15 days. A strong, clean offer is key!
Strong buyer demand keeps the Castro Valley market moving incredibly fast. With homes frequently selling above their $1.2 million median price, decisive action is essential. To win here, buyers need to submit competitive offers quickly and minimize...