3901 Happy Valley Rd is a 6,585 square foot house on a 2.74 acre lot with 6 bedrooms and 4 bathrooms. Based on Redfin's Lafayette data, we estimate the home's value is $3,760,862.
Single-familyProperty Type
1980Year Built
2.74 acresLot Size
$571Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$3,760,862
$55K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 12.5% higher than the average sale price ($3.34M) of 6 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$21,586 (+1.7%)
$784,461 + $1,047,476
$1,831,937
2024
$21,220 (+1.8%)
$769,080 + $1,026,938
$1,796,018
2023
$20,854 (+1.6%)
$754,000 + $1,006,802
$1,760,802
2022
$20,535 (+3.0%)
$739,216 + $987,061
$1,726,277
2021
$19,941 (−0.4%)
$724,722 + $967,707
$1,692,429
2020
$20,013 (+2.5%)
$710,512 + $948,733
$1,659,245
2019
$19,531 (+3.7%)
$703,227 + $939,005
$1,642,232
2018
$18,842 (+1.7%)
$689,439 + $920,594
$1,610,033
2017
$18,519 (+1.9%)
$662,668 + $884,848
$1,547,516
2016
$18,182 (+2.8%)
$662,668 + $884,848
$1,547,516
2015
$17,692 (+0.8%)
$649,675 + $867,499
$1,517,174
2014
$17,544 (+1.1%)
$627,382 + $837,732
$1,465,114
2013
$17,348 (+3.1%)
$627,382 + $837,732
$1,465,114
2012
$16,829 (+1.5%)
$624,547 + $833,946
$1,458,493
2011
$16,580 (+1.9%)
$612,301 + $817,595
$1,429,896
2010
$16,273 (+0.3%)
$600,296 + $801,564
$1,401,860
2009
$16,229 (+1.8%)
$595,810 + $795,574
$1,391,384
2008
$15,949
$597,226 + $797,464
$1,394,690
Tax history for 3901 Happy Valley Rd
Year
Property tax
Land + Additions
Assessment*
2025
$21,586 (+1.7%)
$784,461 + $1,047,476
$1,831,937
2024
$21,220 (+1.8%)
$769,080 + $1,026,938
$1,796,018
2023
$20,854 (+1.6%)
$754,000 + $1,006,802
$1,760,802
2022
$20,535 (+3.0%)
$739,216 + $987,061
$1,726,277
2021
$19,941 (−0.4%)
$724,722 + $967,707
$1,692,429
2020
$20,013 (+2.5%)
$710,512 + $948,733
$1,659,245
2019
$19,531 (+3.7%)
$703,227 + $939,005
$1,642,232
2018
$18,842 (+1.7%)
$689,439 + $920,594
$1,610,033
2017
$18,519 (+1.9%)
$662,668 + $884,848
$1,547,516
2016
$18,182 (+2.8%)
$662,668 + $884,848
$1,547,516
2015
$17,692 (+0.8%)
$649,675 + $867,499
$1,517,174
2014
$17,544 (+1.1%)
$627,382 + $837,732
$1,465,114
2013
$17,348 (+3.1%)
$627,382 + $837,732
$1,465,114
2012
$16,829 (+1.5%)
$624,547 + $833,946
$1,458,493
2011
$16,580 (+1.9%)
$612,301 + $817,595
$1,429,896
2010
$16,273 (+0.3%)
$600,296 + $801,564
$1,401,860
2009
$16,229 (+1.8%)
$595,810 + $795,574
$1,391,384
2008
$15,949
$597,226 + $797,464
$1,394,690
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Nov 18, 2024 • Final
Building - residential mechanical
Remove and replace three heating and air conditioning systems. A HERS report may be required at the final inspection.
HVAC
Jan 30, 2010 • Final
Building/residential/ad/single family addition
Construct an addition, rebuild portions of the structure, and perform a major remodel.
Addition
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: 14
Exterior
Pool Information
Has Pool
Property Information
Subdivision Name: ACALANES RHO
Living Sq. Ft: 6,585
Ground Floor Sq. Ft: 6,585
Building Sq. Ft: 6,585
# of Stories: 1
Legal Description: POR RO ACALANES
Parking & Garage Information
Garage/Parking Sq. Ft: 528
Lot Information
# of Buildings: 1
Land Sq. Ft: 119,354
Legal Lot Number: 1
Acres: 2.74
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 6
Baths: 4.0
Sq. Ft.: 6,585
Stories: 1.0
Lot Size: 2.74 acres
Style: Single Family Residential
Year Built: 1980
Year Renovated: 1980
County: Contra Costa County
APN: 2461200178
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 • 2.1mi
8/10
Acalanes High School
Public 9-12 • Assigned • 2.6mi
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
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
$3.57M – $4.33M
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