18725 Walnut Rd is a 3,845 square foot house on a 9,980 square foot lot with 3 bedrooms and 3 bathrooms. Based on Redfin's Castro Valley data, we estimate the home's value is $1,712,025.
Single-familyProperty Type
1979Year Built
9,980 sq ftLot Size
$445Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$1,712,025
$59K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 26.4% higher than the average sale price ($1.35M) of 5 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
$7,269 (+2.4%)
$115,389 + $433,923
$549,312
2024
$7,102 (+1.7%)
$115,389 + $433,923
$549,312
2023
$6,980 (+2.1%)
$113,127 + $425,415
$538,542
2022
$6,839 (+2.7%)
$108,734 + $408,897
$517,631
2021
$6,661 (+2.4%)
$108,734 + $408,897
$517,631
2020
$6,508 (−1.7%)
$106,603 + $400,881
$507,484
2019
$6,623 (+2.9%)
$105,510 + $396,772
$502,282
2018
$6,434 (+2.7%)
$103,442 + $388,994
$492,436
2017
$6,264 (+5.1%)
$99,425 + $373,891
$473,316
2016
$5,959 (+7.0%)
$99,425 + $373,891
$473,316
2015
$5,569 (+1.3%)
$97,476 + $366,560
$464,036
2014
$5,496 (+0.8%)
$94,132 + $353,983
$448,115
2013
$5,450 (+2.1%)
$94,132 + $353,983
$448,115
2012
$5,338 (+1.4%)
$93,707 + $352,385
$446,092
2011
$5,265 (+0.7%)
$91,870 + $345,477
$437,347
2010
$5,227 (−0.4%)
$90,068 + $338,703
$428,771
2009
$5,248 (+3.4%)
$89,395 + $336,172
$425,567
2008
$5,076
$89,608 + $336,971
$426,579
Tax history for 18725 Walnut Rd
Year
Property tax
Land + Additions
Assessment*
2025
$7,269 (+2.4%)
$115,389 + $433,923
$549,312
2024
$7,102 (+1.7%)
$115,389 + $433,923
$549,312
2023
$6,980 (+2.1%)
$113,127 + $425,415
$538,542
2022
$6,839 (+2.7%)
$108,734 + $408,897
$517,631
2021
$6,661 (+2.4%)
$108,734 + $408,897
$517,631
2020
$6,508 (−1.7%)
$106,603 + $400,881
$507,484
2019
$6,623 (+2.9%)
$105,510 + $396,772
$502,282
2018
$6,434 (+2.7%)
$103,442 + $388,994
$492,436
2017
$6,264 (+5.1%)
$99,425 + $373,891
$473,316
2016
$5,959 (+7.0%)
$99,425 + $373,891
$473,316
2015
$5,569 (+1.3%)
$97,476 + $366,560
$464,036
2014
$5,496 (+0.8%)
$94,132 + $353,983
$448,115
2013
$5,450 (+2.1%)
$94,132 + $353,983
$448,115
2012
$5,338 (+1.4%)
$93,707 + $352,385
$446,092
2011
$5,265 (+0.7%)
$91,870 + $345,477
$437,347
2010
$5,227 (−0.4%)
$90,068 + $338,703
$428,771
2009
$5,248 (+3.4%)
$89,395 + $336,172
$425,567
2008
$5,076
$89,608 + $336,971
$426,579
*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
Dec 5, 2025 • Active
Building
Install an interior elevator in an existing single-family home.
Electrical
Sep 3, 2025 • Active
Building
Remove and replace an air conditioning unit with a 15 SEER, 3 ton unit.
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: 8
Exterior
Exterior Information
Building Style Type: L-Shape
Construction Type: Wood
Building Construction Quality: Good
Property Information
Living Sq. Ft: 3,845
Building Sq. Ft: 3,845
# of Units: 1
# of Stories: 1
Parking & Garage Information
# of Parking Spaces: 2
Lot Information
# of Buildings: 1
Land Sq. Ft: 9,980
Legal Lot Number: 1
Municipality Name: CASTRO VALLEY UNINCORP
Acres: 0.2291
County Use Description: SINGLE FAMILY RESIDENTIAL HOME
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 3
Baths: 3.0
Sq. Ft.: 3,845
Stories: 1.0
Lot Size: 9,980 square feet
Style: Single Family Residential
Year Built: 1979
Year Renovated: 1981
County: Alameda County
APN: 084D115502202
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 • 1.9mi
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...