2138 Stone Valley Rd is a 4,183 square foot house on a 0.5 acre lot with 3 bedrooms and 3 bathrooms. - it last sold on June 04, 1971 for $27,500. Based on Redfin's Alamo data, we estimate the home's value is $2,691,420.
Single-familyProperty Type
1946Year Built
0.5 acresLot Size
$643Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$2,691,420
$2.7M since sold in June 1971$7,000 since September
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 10% lower than the average sale price ($2.99M) 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.
Permits
Aug 14, 2024 • Final
Building - residential mechanical
Heat pump
HVAC
Jan 30, 2010 • Final
Building - residential re-roof
Replace the roof with a minimum class C fire-rated material.
Roofing
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: 10
Exterior
Pool Information
Has Pool
Property Information
Subdivision Name: A W STONE RANCH
Living Sq. Ft: 4,183
Ground Floor Sq. Ft: 2,522
Building Sq. Ft: 4,183
# of Stories: 2
Legal Description: POR DIV H STONE RANCH
Parking & Garage Information
Garage/Parking Sq. Ft: 1,023
Lot Information
# of Buildings: 1
Land Sq. Ft: 21,780
Legal Lot Number: G
Acres: 0.5
Zoning Code: R-20
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 3.0
Sq. Ft.: 4,183
Stories: 2.0
Lot Size: 0.5 acres
Style: Single Family Residential
Year Built: 1946
Year Renovated: 1950
County: Contra Costa County
APN: 1931300089
Home facts updated by county records on Oct 10, 2026
Around this home
Schools
Rancho Romero Elementary School
Public K-5 • Assigned • 1.1mi
9/10
Stone Valley Middle School
Public 6-8 • Assigned • 0.4mi
10/10
Monte Vista High School
Public 9-12 • Assigned • 1.9mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
4/10 Fire Factor
2% chance of being in a wildfire in next 30 years
3/10 Heat Factor
8 days above 95° expected this year, 16 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
9/10 Air Factor
17 unhealthy days expected this year, 17 days in 30 years
Provided by First Street
Historical weather
Alamo, CA • 94507
Average low and high temperatures (°F)
58
39
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42
68
46
68
47
74
51
80
54
82
56
86
58
81
59
76
53
62
44
56
43
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
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Dec
Sun exposure
In this area, properties receive around 11.5 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
11.5 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$2.56M – $3.10M
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