3827 Happy Valley Rd is a 3,165 square foot house on a 0.91 acre lot with 3 bedrooms and 3 bathrooms. - it last sold on May 15, 1998 for $825,000. Based on Redfin's Lafayette data, we estimate the home's value is $2,950,116.
Single-familyProperty Type
1953Year Built
0.91 acresLot Size
$932Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$2,950,116
$2.1M since sold in May 1998$95K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 11.2% lower than the average sale price ($3.32M) 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
Sep 17, 2019 • Final
Building - residential solar photovoltaic
Install a roof-mounted solar photovoltaic system and a battery backup energy storage system.
Battery
Electrical
Solar
Jul 3, 2019 • Final
Building - residential re-roof
Install a new cool roof with composition shingles on a residential building.
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
Heating & Cooling
Heating Type: Forced Air
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 8
Exterior
Exterior Information
Physical Condition: Good
Building Construction Quality: Good
Pool Information
Has Pool
Property Information
Living Sq. Ft: 3,165
Ground Floor Sq. Ft: 3,165
Building Sq. Ft: 3,165
# of Stories: 1
Legal Description: POR RO ACALANES
Parking & Garage Information
Garage/Parking Sq. Ft: 800
Lot Information
# of Buildings: 1
Land Sq. Ft: 39,640
Acres: 0.91
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 3.0
Sq. Ft.: 3,165
Stories: 1.0
Lot Size: 0.91 acres
Style: Single Family Residential
Year Built: 1953
Year Renovated: 1953
County: Contra Costa County
APN: 2440100028
Home facts updated by county records on Jul 13, 2026
Around this home
Schools
Happy Valley Elementary School
Public K-5 • Assigned • 0.2mi
8/10
M. H. Stanley Middle School
Public 6-8 • Assigned • 1.8mi
8/10
Acalanes High School
Public 9-12 • Assigned • 2.3mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
5/10 Flood Factor
Estimated 19-29% chance 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 95° 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
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
Nov
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
$2.80M – $3.39M
Reach more buyers when you sell with Redfin. Save up to $29,501 in fees.3 minutes to get started.