3221 Stone Valley Rd is a 2,501 square foot house on a 0.5 acre lot with 5 bedrooms and 3 bathrooms. - it last sold on October 10, 1985 for $323,180. Based on Redfin's Alamo data, we estimate the home's value is $2,028,341.
Single-familyProperty Type
1973Year Built
0.5 acresLot Size
$811Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$2,028,341
$1.7M since sold in October 1985$46K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 21.2% lower than the average sale price ($2.57M) 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.
Permits
Feb 18, 2025 • Final
Building - residential mechanical
Replace the air conditioning system with a heat pump, furnace, and air handler. A HERS report may be required at the final inspection.
HVAC
Mar 11, 2022 • Final
Building/grading/gn/grading unsupervised
Demolish a swimming pool and backfill the area for landscaping purposes. Break holes in the bottom of the pool, break down side walls below grade, and import clean fill material to restore the original grade.
Demolition
Pool and hot tub
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
Heating & Cooling
Air Conditioning Type: Central
Heating Fuel Type: Gas
Heating Type: Forced Air
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 11
Exterior
Exterior Information
Physical Condition: Good
Foundation Type: Raised W/Crawlspace
Building Style Type: Ranch
Construction Type: Frame
Building Construction Quality: Good
Exterior Wall: Wood Siding
Pool Information
Has Pool
View Information
View: Good
Property Information
Living Sq. Ft: 2,501
Ground Floor Sq. Ft: 2,501
Building Sq. Ft: 2,501
# of Stories: 1
Legal Description: TRACT 4184 POR LOT 8
Parking & Garage Information
# of Parking Spaces: 3
Garage/Parking Sq. Ft: 613
Lot Information
# of Buildings: 1
Land Sq. Ft: 21,720
Legal Lot Number: 8
Acres: 0.4986
Zoning Code: R-20
County Use Description: SINGLE FAMILY DETACHED WITH MA
Utility Information
Sewer Type: Public
Water Service Type: Public
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 5
Baths: 3.0
Sq. Ft.: 2,501
Stories: 1.0
Lot Size: 0.5 acres
Style: Single Family Residential
Year Built: 1973
Year Renovated: 1983
County: Contra Costa County
APN: 1941210112
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Green Valley Elementary School
Public K-5 • Assigned • 1.0mi
10/10
Los Cerros Middle School
Public 6-8 • Assigned • 0.6mi
10/10
Monte Vista High School
Public 9-12 • Assigned • 0.5mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
6/10 Flood Factor
Estimated 70-78% chance of a flood reaching the building in the next 30 years
5/10 Fire Factor
5% chance of being in a wildfire in next 30 years
4/10 Heat Factor
7 days above 95° expected this year, 14 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
14 unhealthy days expected this year, 15 days in 30 years
Provided by First Street
Historical weather
Alamo, CA • 94507
Average low and high temperatures (°F)
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55
86
58
83
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76
53
62
44
56
43
Jan
Feb
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Sun exposure
In this area, properties receive around 11.8 hours in
June and 4.8 hours in December, placing it above the
U.S. average for solar exposure.
11.8 hrs
4.8 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.93M – $2.33M
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