18742 Walnut Rd, Castro Valley, CA 94546

Off Market Jan 2002 for $450K

$1,406,993

Est. refi paymentEst. refi $2,920/mo

•

2,100

sq ft

18742 Walnut Rd, Castro Valley, CA 94546

About this home

Single-familyProperty Type

1970Year Built

0.26 acresLot Size

$670Est. Price/Sq.Ft.

2 car garageParking

Listed by Mike Southwick •DRE #01019265 • Shamrock, REALTORS?

Bought with Thomas Dec •DRE #00547767 • John P Gennoy Realty

Redfin checked: a minute ago

•Source:bridgeMLS, Bay East AOR, or Contra Costa AOR #11111291

Redfin Estimate

$1,406,993

$957K since sold in January 2002$7,000 since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 6.6% higher than the average sale price ($1.32M) of 6 comparable homes.

SOLD JAN 7, 2026
$1,335,000
A
3 beds2.5 baths2,018 sq ft
17838 Walnut Rd, Castro Valley, CA 94546
SOLD MAR 20, 2026
$1,362,000
B
3 beds2.5 baths2,391 sq ft
18153 Plymouth Dr, Castro Valley, CA 94546
SOLD SEP 2, 2025
$1,475,000
C
3 beds2 baths1,976 sq ft
18767 Lamson Rd, Castro Valley, CA 94546
SOLD JUN 9, 2026
$1,175,000
D
3 beds2.5 baths1,699 sq ft
18419 Clifton Way, Castro Valley, CA 94546
SOLD JUN 10, 2026
$1,468,888
E
4 beds2.5 baths2,086 sq ft
19304 Barclay Rd, Castro Valley, CA 94546
SOLD MAY 21, 2026
$1,100,000
F
3 beds2.5 baths1,704 sq ft
2728 Sheffield Pl, Castro Valley, CA 94546

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Earn from this home

Sell

$1,233,126

Est. take-home

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Refinance

Est. cash available

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Rent

$3,673/mo

Redfin rental estimate

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Market trends in 94546, CA

Last updated August 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-List Price

105.6%

+0.7% MoM

Median sale price

$1.1M

$45K MoM

Avg. days on market

13d

1 days MoM

Recently sold homes

100

5 MoM

New listings for sale

OPEN SUN, 1PM TO 3PM
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20275 Stanton Ave, Castro Valley, CA 94546
OPEN SAT, 1:30PM TO 4PM
$799,000
2 beds1 bath1,122 sq ft
1540 Crescent Ave, Castro Valley, CA 94546
COMING SOON
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2 beds1 bath1,079 sq ft
18473 Apricot Way, Castro Valley, CA 94546
$1,175,000
3 beds2 baths1,440 sq ft
19453 Vaughn Ave, Castro Valley, CA 94546
Pacific Home Brokers
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(415) 510-8600
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COMING SOON
$1,550,000
3 beds1.5 baths1,851 sq ft
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HOT HOME
$699,999
3 beds1 bath1,036 sq ft
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$549,950
3 beds2 baths1,354 sq ft
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See all

Provided by Redfin

Sale history for 18742 Walnut Rd

Year

Property tax

Land + Additions

Assessment*

2025

$9,347 (+2.3%)

$217,641 + $507,830

$725,471

2024

$9,138 (+1.6%)

$217,641 + $507,830

$725,471

2023

$8,990 (+2.0%)

$213,375 + $497,875

$711,250

2022

$8,816 (+2.6%)

$205,090 + $478,544

$683,634

2021

$8,590 (+2.3%)

$205,090 + $478,544

$683,634

2020

$8,393 (−1.8%)

$201,070 + $469,163

$670,233

2019

$8,546 (+2.9%)

$199,009 + $464,354

$663,363

2018

$8,304 (+2.7%)

$195,107 + $455,250

$650,357

2017

$8,086 (+5.1%)

$187,532 + $437,574

$625,106

2016

$7,693 (+7.0%)

$187,532 + $437,574

$625,106

2015

$7,190 (+1.2%)

$183,855 + $428,996

$612,851

2014

$7,106 (+7.4%)

$177,547 + $414,277

$591,824

2013

$6,615 (+8.7%)

$177,547 + $414,277

$591,824

2012

$6,087 (−4.9%)

$185,000 + $365,000

$550,000

2011

$6,399

$151,200 + $352,800

$504,000

2010

$6,399 (−6.0%)

$158,700 + $370,300

$529,000

2009

$6,806 (+3.2%)

$158,700 + $370,300

$529,000

2008

$6,597

$169,015 + $394,370

$563,385

Tax history for 18742 Walnut Rd

Year

Property tax

Land + Additions

Assessment*

2025

$9,347 (+2.3%)

$217,641 + $507,830

$725,471

2024

$9,138 (+1.6%)

$217,641 + $507,830

$725,471

2023

$8,990 (+2.0%)

$213,375 + $497,875

$711,250

2022

$8,816 (+2.6%)

$205,090 + $478,544

$683,634

2021

$8,590 (+2.3%)

$205,090 + $478,544

$683,634

2020

$8,393 (−1.8%)

$201,070 + $469,163

$670,233

2019

$8,546 (+2.9%)

$199,009 + $464,354

$663,363

2018

$8,304 (+2.7%)

$195,107 + $455,250

$650,357

2017

$8,086 (+5.1%)

$187,532 + $437,574

$625,106

2016

$7,693 (+7.0%)

$187,532 + $437,574

$625,106

2015

$7,190 (+1.2%)

$183,855 + $428,996

$612,851

2014

$7,106 (+7.4%)

$177,547 + $414,277

$591,824

2013

$6,615 (+8.7%)

$177,547 + $414,277

$591,824

2012

$6,087 (−4.9%)

$185,000 + $365,000

$550,000

2011

$6,399

$151,200 + $352,800

$504,000

2010

$6,399 (−6.0%)

$158,700 + $370,300

$529,000

2009

$6,806 (+3.2%)

$158,700 + $370,300

$529,000

2008

$6,597

$169,015 + $394,370

$563,385

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Public record

Public record
Zoning
Permits

Beds

Baths

Stories

Lot width

—

Lot depth

—

Lot size

0.26 Acres

Year renovated

1970

Sq. Ft.

1,928

Year built

1970

Style

Single Family Residential

County

Alameda County

APN

084D116802901

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Jul 27, 2026.

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

May 21, 2026 • Final

Building

Roofing

Oct 12, 2007 • Final

Building

Perform an addition and remodel by enclosing an existing second-floor patio and deck to create a new bedroom and bathroom. Expand a downstairs bedroom, replace the roof framing with new trusses and operable skylights, and add a new front porch roof with columns. Remodel an upstairs bedroom into a closet and laundry room, and modify the interior stairs.

Addition

Remodel

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

Parking

Parking Information
Has Attached Garage
Garage Spaces: 2
Covered Spaces: 2
Parking Features: Attached, RV/Boat Parking, Side Yard Access, Garage Door Opener

Interior

Bathroom Information
# of Bathrooms Total: 3
# of Bathrooms Full: 3
Other Bathrooms Included Features: Shower Over Tub, Stall Shower

Interior Features
Interior Features: Atrium, Family Room, Kitchen/Family Combo, Updated Kitchen
Appliances: Dishwasher
Laundry Features: Laundry Closet
Upper Level Features: 2 Bedrooms, 2 Baths, Laundry Facility
Street Level Features: 1 Bedroom, 1 Bath, Main Entry
Window Features: Window Coverings
Fireplaces Total: 1
Has Fireplace
Flooring: Linoleum, Carpet

Room Information
Kitchen Features: Dishwasher,Updated Kitchen
Rooms Total: 7
Fireplace Features: Free Standing, Wood Burning

Exterior

Building Information
Construction Materials: Wood Siding
Building Area Total: 2,100
Foundation Details: Raised

Exterior Features
Exterior Features: Back Yard, Front Yard
Roof: Shingle

Property Information
Living Area: 2100
Living Area Units: Square Feet
Property Type: Residential
Property Sub Type: Single Family Residence
Year Built: 1970

Lot Information
Lot Size Square Feet: 11310
Lot Size Area: 0.25
Lot Size Units: Acres
Lot Size Acres: 0.25
Lot Features: Sloped Up

Utilities

Utility Information
Water Source: Public

Heating & Cooling
Has Heating
Heating: Forced Air
Cooling: Wall/Window Unit(s)

Location

School Information
High School District: Castro Valley (510) 537-3000

Public facts

Beds: 2
Baths: 2.0
Sq. Ft.: 1,928
Stories: 2.0
Lot Size: 0.26 acres
Style: Single Family Residential
Year Built: 1970
Year Renovated: 1970
County: Alameda County
APN: 084D116802901

Home facts updated by county records on Jul 27, 2026

Around this home

Schools

Chabot Elementary School

Public K-5 • Assigned • 0.4mi

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!
2 weeks ago • Castro Valley
Johnny Singh
Redfin Premier agent
146 deals
Was this helpful?
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...
1 month ago • Castro Valley
Karan Kandel
Redfin agent
13 deals
Was this helpful?

Climate risks

6/10 Flood Factor

Estimated 70-78% chance of a flood reaching the building in the next 30 years

3/10 Fire Factor

0.46% chance of being in a wildfire in next 30 years

3/10 Heat Factor

7 days above 88° expected this year, 14 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

7/10 Air Factor

12 unhealthy days expected this year, 12 days in 30 years

Provided by First Street

Historical weather

Castro Valley, CA • 94546

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 11.2 hours in June and 4.9 hours in December, placing it above the U.S. average for solar exposure.

11.2 hrs

4.9 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$1.34M – $1.62M

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New listings for sale in 94546

OPEN SUN, 1PM TO 3PM

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OPEN WED, 10:30AM TO 12PM

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OPEN SAT, 1:30PM TO 4PM

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COMING SOON

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18473 Apricot Way, Castro Valley, CA 94546

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Pacific Home Brokers

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(415) 510-8600

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COMING SOON

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HOT HOME

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Home values near 18742 Walnut Rd

Data from public records.

Address	Redfin Estimate
18714 Walnut Rd, Castro Valley, CA 3 Beds \| 2 Baths \| 2358 Sq. Ft.	$1,383,071
18759 Walnut Rd, Castro Valley, CA 3 Beds \| 2 Baths \| 1898 Sq. Ft.	$1,263,023

Address	Redfin Estimate
18749 Walnut Rd, Castro Valley, CA 3 Beds \| 2 Baths \| 1532 Sq. Ft.	$1,218,819
18765 Walnut Rd, Castro Valley, CA 3 Beds \| 1.5 Baths \| 1654 Sq. Ft.	$1,332,327

Address	Redfin Estimate
18755 Walnut Rd, Castro Valley, CA 3 Beds \| 3 Baths \| 1616 Sq. Ft.	$1,446,467
18713 Walnut Rd, Castro Valley, CA 5 Beds \| 3 Baths \| 2893 Sq. Ft.	$1,720,032

Property information provided by bridgeMLS, Bay East AOR, or Contra Costa AOR when last listed in 2001. This data may not match . Learn more.

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 94546, CA

Sale history for 18742 Walnut Rd

Tax history for 18742 Walnut Rd

Public record

Property details

Around this home

Schools

Lifestyle

Local insights from Redfin agents

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 94546

Home values near 18742 Walnut Rd

More real estate resources