3937 Happy Valley Rd is a 4,208 square foot house on a 0.92 acre lot with 3 bedrooms and 5 bathrooms. - it last sold on August 26, 2025 for $8,000,000. Based on Redfin's Lafayette data, we estimate the home's value is $6,937,410.
Single-familyProperty Type
2009Year Built
0.92 acresLot Size
$1,649Est. Price/Sq.Ft.
2 car garageParking
Source:Public Records
Redfin Estimate
$6,937,410
$1.1M since sold in August 2025$631K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 43% higher than the average sale price ($4.85M) of 6 comparable homes.
bridgeMLS, Bay East AOR, or Contra Costa AOR #41137525
Jun 8, 2026
Listed
*
Jun 7, 2026
Coming Soon
*
Public Records
Aug 26, 2025
Sold
$8,000,000
$1,901/sq ft
Public Records
Sep 10, 2014
Sold
$5,500,000
$1,307/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$57,529 (+1.7%)
$5,000,000 + $3,000,000
$8,000,000
2024
$56,565 (+1.7%)
$3,320,106 + $1,787,746
$5,107,852
2023
$55,631 (+1.5%)
$3,255,006 + $1,752,693
$5,007,699
2022
$54,789 (+3.0%)
$3,191,183 + $1,718,327
$4,909,510
2021
$53,202 (−0.7%)
$3,128,611 + $1,684,635
$4,813,246
2020
$53,572 (+1.6%)
$3,067,266 + $1,651,603
$4,718,869
2019
$52,750 (+3.7%)
$3,035,815 + $1,634,668
$4,670,483
2018
$50,877 (+1.7%)
$2,976,290 + $1,602,616
$4,578,906
2017
$50,003 (−3.5%)
$2,860,718 + $1,540,386
$4,401,104
2016
$51,815 (−15.9%)
$2,860,718 + $1,540,386
$4,401,104
2015
$61,606 (+184.2%)
$2,804,626 + $1,750,183
$4,554,809
2014
$21,680 (+1.1%)
$72,971 + $1,765,020
$1,837,991
2013
$21,445 (+3.1%)
$72,971 + $1,765,020
$1,837,991
2012
$20,806 (+1.5%)
$72,642 + $1,757,044
$1,829,686
2011
$20,504 (+1.6%)
$71,218 + $1,722,593
$1,793,811
2010
$20,173 (+303.3%)
$69,822 + $1,688,817
$1,758,639
2009
$5,002 (+1.7%)
$69,301 + $1,368,146
$1,437,447
2008
$4,920
$69,466 + $308,782
$378,248
Tax history for 3937 Happy Valley Rd
Year
Property tax
Land + Additions
Assessment*
2025
$57,529 (+1.7%)
$5,000,000 + $3,000,000
$8,000,000
2024
$56,565 (+1.7%)
$3,320,106 + $1,787,746
$5,107,852
2023
$55,631 (+1.5%)
$3,255,006 + $1,752,693
$5,007,699
2022
$54,789 (+3.0%)
$3,191,183 + $1,718,327
$4,909,510
2021
$53,202 (−0.7%)
$3,128,611 + $1,684,635
$4,813,246
2020
$53,572 (+1.6%)
$3,067,266 + $1,651,603
$4,718,869
2019
$52,750 (+3.7%)
$3,035,815 + $1,634,668
$4,670,483
2018
$50,877 (+1.7%)
$2,976,290 + $1,602,616
$4,578,906
2017
$50,003 (−3.5%)
$2,860,718 + $1,540,386
$4,401,104
2016
$51,815 (−15.9%)
$2,860,718 + $1,540,386
$4,401,104
2015
$61,606 (+184.2%)
$2,804,626 + $1,750,183
$4,554,809
2014
$21,680 (+1.1%)
$72,971 + $1,765,020
$1,837,991
2013
$21,445 (+3.1%)
$72,971 + $1,765,020
$1,837,991
2012
$20,806 (+1.5%)
$72,642 + $1,757,044
$1,829,686
2011
$20,504 (+1.6%)
$71,218 + $1,722,593
$1,793,811
2010
$20,173 (+303.3%)
$69,822 + $1,688,817
$1,758,639
2009
$5,002 (+1.7%)
$69,301 + $1,368,146
$1,437,447
2008
$4,920
$69,466 + $308,782
$378,248
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Jan 22, 2025 • Final
Building - residential mechanical
Replace the furnace and air conditioner in a residential building. A HERS report may be required at the final inspection.
HVAC
Dec 31, 2019 • Final
Building - residential solar photovoltaic
Install a roof-mounted solar system with energy storage systems.
Battery
Electrical
Solar
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: 11
Exterior
Pool Information
Has Pool
Property Information
Subdivision Name: ACALANES RHO
Living Sq. Ft: 4,208
Ground Floor Sq. Ft: 4,208
Building Sq. Ft: 4,208
# of Stories: 1
Legal Description: RO ACALANES .92 AC
Parking & Garage Information
Garage/Parking Sq. Ft: 698
Lot Information
# of Buildings: 1
Land Sq. Ft: 40,075
Acres: 0.92
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 5.0
Sq. Ft.: 4,208
Stories: 1.0
Lot Size: 0.92 acres
Style: Single Family Residential
Year Built: 2009
Year Renovated: 2012
County: Contra Costa County
APN: 2461200111
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
2% 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
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
87/ 100
Very good sunlight
Sunscore
There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
9.8 hrs
6.2 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$6.59M – $7.98M
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