18697 Walnut Rd is a 3,633 square foot house on a 9,165 square foot lot with 4 bathrooms. - it last sold on August 18, 2004 for $440,000. Based on Redfin's Castro Valley data, we estimate the home's value is $1,762,655.
Single-familyProperty Type
1949Year Built
9,165 sq ftLot Size
$485Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$1,762,655
$1.3M since sold in August 2004$1,000 since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 29.7% higher than the average sale price ($1.36M) of 5 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
Mar 23, 2009 • Final
Building
Complete a first and second story addition to an existing single-family home. The project includes enlarging the kitchen and entry room, adding a media room, demolishing a detached garage to construct a new attached three-car garage, and adding three bedrooms, two bathrooms, and a laundry room.
Addition
Jun 26, 2008 • Final
Building
Addition
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
Room Information
# of Rooms: 12
Exterior
Exterior Information
Building Style Type: L-Shape
Construction Type: Wood
Building Construction Quality: Good
Property Information
Subdivision Name: Q566
Living Sq. Ft: 3,633
Building Sq. Ft: 3,633
# of Units: 1
# of Stories: 2
Legal Description: TRACT 566 PART OF LOT 27
Parking & Garage Information
# of Parking Spaces: 4
Lot Information
# of Buildings: 1
Land Sq. Ft: 9,165
Legal Lot Number: 27
Municipality Name: CASTRO VALLEY UNINCORP
Acres: 0.2104
County Use Description: SINGLE FAMILY RESIDENTIAL HOME
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: —
Baths: 4.0
Sq. Ft.: 3,633
Stories: 2.0
Lot Size: 9,165 square feet
Style: Single Family Residential
Year Built: 1949
Year Renovated: 1988
County: Alameda County
APN: 084D115800801
Home facts updated by county records on Jul 27, 2026
Around this home
Schools
Places
Transit
Chabot Elementary School
Public K-5 • Assigned • 0.5mi
9/10
Creekside Middle School
Public 6-8 • Assigned • 1.8mi
10/10
Castro Valley High School
Public 9-12 • Assigned • 0.9mi
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...