4115 Happy Valley Rd is a 4,948 square foot house on a 10.54 acre lot. - it last sold on June 30, 1992 for $1,700,000. Based on Redfin's Lafayette data, we estimate the home's value is $4,713,816.
Single-familyProperty Type
1970Year Built
10.54 acresLot Size
$953Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$4,713,816
$3.0M since sold in June 1992$36K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 60.1% higher than the average sale price ($2.94M) 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
Jun 30, 2025 • Active
Building - residential mechanical
Convert an air conditioning unit to a heat pump in the backyard. Replace a furnace in a closet. A HERS report may be required at the final inspection.
Heat pump
HVAC
Apr 27, 2022 • Final
Building - residential electrical
Install an advanced energy system including battery storage units, a backup gateway with an internal panelboard, and a backup loads panel.
Battery
Electrical
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
Exterior
Property Information
Subdivision Name: ACALANES RHO
Living Sq. Ft: 4,948
Ground Floor Sq. Ft: 4,948
Building Sq. Ft: 4,948
# of Stories: 1
Legal Description: POR RO ACALANES
Lot Information
# of Buildings: 1
Land Sq. Ft: 459,122
Acres: 10.54
County Use Description: URBAN ACREAGE 10-40A
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: —
Baths: —
Sq. Ft.: 4,948
Stories: 1.0
Lot Size: 10.54 acres
Style: Single Family Residential
Year Built: 1970
Year Renovated: 1990
County: Contra Costa County
APN: 2470100153
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Happy Valley Elementary School
Public K-5 • Assigned • 1.0mi
8/10
M. H. Stanley Middle School
Public 6-8 • Assigned • 2.9mi
8/10
Acalanes High School
Public 9-12 • Assigned • 3.5mi
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
2/10 Heat Factor
7 days above 92° expected this year, 15 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
Lafayette, CA • 94549
Average low and high temperatures (°F)
60
43
62
46
70
50
68
49
75
52
78
54
79
55
87
58
84
59
77
56
63
48
57
45
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
$4.48M – $5.42M
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