3929 Happy Valley Rd is a 4,078 square foot house on a 1.1 acre lot with 4 bedrooms and 4 bathrooms. - it last sold on June 14, 1991 for $1,083,500. Based on Redfin's Lafayette data, we estimate the home's value is $4,046,375.
Single-familyProperty Type
1956Year Built
1.1 acresLot Size
$992Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$4,046,375
$3.0M since sold in June 1991$85K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 0.7% higher than the average sale price ($4.02M) of 6 comparable homes.
Construct a conditioned cabana featuring a bedroom and a bathroom.
ADU
May 30, 2012 • Final
Building/commercial/d/demolition
Demolish an existing pool house.
Demolition
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
Heating Fuel Type: Gas
Heating Type: Central
Fireplace Information
# of Fireplaces: 3
Has Fireplace
Room Information
# of Rooms: 10
Exterior
Exterior Information
Physical Condition: Good
Foundation Type: Slab
Building Style Type: Ranch
Building Construction Quality: Good
Exterior Wall: Wood
Pool Information
Has Pool
Property Information
Subdivision Name: RANCHO ACALANES
Living Sq. Ft: 4,078
Ground Floor Sq. Ft: 4,078
Building Sq. Ft: 4,078
# of Stories: 1
Legal Description: RO ACALANES 1.10 AC
Parking & Garage Information
# of Parking Spaces: 2
Parking Type: Garage/Carport
Garage/Parking Sq. Ft: 432
Lot Information
# of Buildings: 1
Land Sq. Ft: 47,916
Acres: 1.1
Depth Footage: 180
Front Footage: 180
County Use Description: SINGLE FAMILY
Utility Information
Sewer Type: Public
Water Service Type: Public
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 4
Baths: 4.0
Sq. Ft.: 4,078
Stories: 1.0
Lot Size: 1.1 acres
Style: Single Family Residential
Year Built: 1956
Year Renovated: 1980
County: Contra Costa County
APN: 2461200079
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Happy Valley Elementary School
Public K-5 • Assigned • 0.3mi
8/10
M. H. Stanley Middle School
Public 6-8 • Assigned • 2.2mi
8/10
Acalanes High School
Public 9-12 • Assigned • 2.7mi
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
1% chance of being in a wildfire in next 30 years
3/10 Heat Factor
7 days above 92° expected this year, 16 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
15 unhealthy days expected this year, 16 days in 30 years
Provided by First Street
Historical weather
Lafayette, CA • 94549
Average low and high temperatures (°F)
60
43
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79
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87
58
84
59
77
56
63
48
57
45
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May
Jun
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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
$3.85M – $4.65M
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