18489 Walnut Rd is a 2,832 square foot house on a 9,777 square foot lot with 3 bedrooms and 2 bathrooms. Based on Redfin's Castro Valley data, we estimate the home's value is $1,452,744.
Single-familyProperty Type
1980Year Built
9,777 sq ftLot Size
$513Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$1,452,744
$6,000 since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 6.9% higher than the average sale price ($1.36M) of 6 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$13,737 (+2.2%)
$381,042 + $716,386
$1,097,428
2024
$13,438 (+1.5%)
$381,042 + $716,386
$1,097,428
2023
$13,234 (+1.9%)
$373,573 + $702,343
$1,075,916
2022
$12,990 (+75.0%)
$359,067 + $675,071
$1,034,138
2021
$7,424 (+2.3%)
$359,067 + $675,071
$1,034,138
2020
$7,254 (−1.8%)
$267,779 + $304,062
$571,841
2019
$7,384 (+2.9%)
$265,035 + $300,945
$565,980
2018
$7,174 (+2.7%)
$259,839 + $295,046
$554,885
2017
$6,984 (+5.1%)
$249,751 + $283,590
$533,341
2016
$6,645 (+7.0%)
$249,751 + $283,590
$533,341
2015
$6,210 (+1.3%)
$244,854 + $278,030
$522,884
2014
$6,133 (+0.8%)
$236,453 + $268,491
$504,944
2013
$6,084 (+2.1%)
$236,453 + $268,491
$504,944
2012
$5,961 (+1.4%)
$235,386 + $267,279
$502,665
2011
$5,880 (+0.7%)
$230,771 + $262,039
$492,810
2010
$5,839 (−0.4%)
$226,246 + $256,901
$483,147
2009
$5,864 (+3.3%)
$224,556 + $254,982
$479,538
2008
$5,677
$225,089 + $255,588
$480,677
Tax history for 18489 Walnut Rd
Year
Property tax
Land + Additions
Assessment*
2025
$13,737 (+2.2%)
$381,042 + $716,386
$1,097,428
2024
$13,438 (+1.5%)
$381,042 + $716,386
$1,097,428
2023
$13,234 (+1.9%)
$373,573 + $702,343
$1,075,916
2022
$12,990 (+75.0%)
$359,067 + $675,071
$1,034,138
2021
$7,424 (+2.3%)
$359,067 + $675,071
$1,034,138
2020
$7,254 (−1.8%)
$267,779 + $304,062
$571,841
2019
$7,384 (+2.9%)
$265,035 + $300,945
$565,980
2018
$7,174 (+2.7%)
$259,839 + $295,046
$554,885
2017
$6,984 (+5.1%)
$249,751 + $283,590
$533,341
2016
$6,645 (+7.0%)
$249,751 + $283,590
$533,341
2015
$6,210 (+1.3%)
$244,854 + $278,030
$522,884
2014
$6,133 (+0.8%)
$236,453 + $268,491
$504,944
2013
$6,084 (+2.1%)
$236,453 + $268,491
$504,944
2012
$5,961 (+1.4%)
$235,386 + $267,279
$502,665
2011
$5,880 (+0.7%)
$230,771 + $262,039
$492,810
2010
$5,839 (−0.4%)
$226,246 + $256,901
$483,147
2009
$5,864 (+3.3%)
$224,556 + $254,982
$479,538
2008
$5,677
$225,089 + $255,588
$480,677
*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
Jul 26, 2024 • Final
Building
Remove and replace an existing residential water heater in the same location.
Plumbing
Water heater
Jan 11, 2023 • Final
Building
Replace the furnace and air conditioning unit with like-for-like equipment.
HVAC
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: 5
Exterior
Exterior Information
Building Style Type: L-Shape
Construction Type: Wood
Building Construction Quality: Good
Property Information
Living Sq. Ft: 2,832
Building Sq. Ft: 2,832
# of Units: 1
# of Stories: 1
Legal Description: MAP 116 PG 26
Parking & Garage Information
# of Parking Spaces: 3
Lot Information
# of Buildings: 1
Land Sq. Ft: 9,777
Legal Lot Number: A
Municipality Name: CASTRO VALLEY UNINCORP
Acres: 0.2244
County Use Description: SINGLE FAMILY RESIDENTIAL HOME
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 3
Baths: 2.0
Sq. Ft.: 2,832
Stories: 1.0
Lot Size: 9,777 square feet
Style: Single Family Residential
Year Built: 1980
Year Renovated: 1981
County: Alameda County
APN: 084D115802700
Home facts updated by county records on Jul 27, 2026
Around this home
Schools
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...