Rare Mid-Century modern secluded estate in coveted Happy Valley. Situated on 1.34 flat acres, this home boasts 6 bedrooms, 5 bathrooms, chef's kitchen, floor-to-ceiling windows, 2 guest cottages & a saltwater pool. Designed by renowned architect John Carl Warnecke.
Single-familyProperty Type
1952Year Built
1.34 acresLot Size
$1,068Est. Price/Sq.Ft.
2 spacesParking
Listed by Anthony Cassel•DRE #01475854• Golden Gate Sotheby's Int'l Re
Listed by Taylor Harriman•DRE #01979921• Golden Gate Sotheby's Int'l Re
Bought with Amanda Thompson•DRE #01911093• Alain Pinel REALTORS
Source:bridgeMLS, Bay East AOR, or Contra Costa AOR #40728181
Redfin Estimate
$4,890,896
$1.2M since sold in July 2018$43K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 1.7% lower than the average sale price ($4.98M) of 6 comparable homes.
bridgeMLS, Bay East AOR, or Contra Costa AOR #40728181
May 20, 2016
Sold
$3,050,000
$666/sq ft
Apr 20, 2016
Price Changed
$2,995,000
$654/sq ft
Apr 20, 2016
Pending
—
Apr 20, 2016
Pending
—
Apr 20, 2016
Relisted
—
Apr 20, 2016
Price Changed
$3,250,000
$710/sq ft
Mar 8, 2016
Contingent
—
Feb 26, 2016
Pending
—
Feb 6, 2016
Listed
$3,250,000
$710/sq ft
+23
Rare Mid-Century modern secluded estate in coveted Happy Valley. Situated on 1.34 flat acres, this home boasts 6 bedrooms, 5 bathrooms, chef's kitchen, floor-to-ceiling windows, 2 guest cottages & a saltwater pool. Designed by renowned architect John Carl Warnecke.
San Francisco MLS #441793
May 20, 2016
Sold
$3,050,000
$666/sq ft
Feb 26, 2016
Pending
—
Feb 6, 2016
Listed
$3,250,000
$710/sq ft
+5
Rare Mid-Century modern secluded estate in coveted Happy Valley. Situated on 1.34 flat acres, this home boasts six bedrooms, five bathrooms, chef's kitchen, floor to ceiling windows, two separate guest cottages and a salt water pool Designed by renowned architect John Carl Warnecke.
San Francisco MLS #440480
Dec 22, 2015
Delisted
—
Dec 9, 2015
Listed
*
bridgeMLS, Bay East AOR, or Contra Costa AOR #40724100
Dec 21, 2015
Listing Removed
—
Dec 9, 2015
Listed
*
bridgeMLS, Bay East AOR, or Contra Costa AOR #11166128
Jan 22, 2003
Sold
$1,900,000
$415/sq ft
Nov 19, 2002
Listing Removed
—
Nov 19, 2002
Listed
$2,350,000
$513/sq ft
bridgeMLS, Bay East AOR, or Contra Costa AOR #22005635
Jan 22, 2003
Sold
$1,900,000
$415/sq ft
Mar 7, 2002
Listing Removed
—
Mar 1, 2002
Listed
$2,350,000
$513/sq ft
bridgeMLS, Bay East AOR, or Contra Costa AOR #11130214
Mar 21, 2002
Listing Removed
—
bridgeMLS, Bay East AOR, or Contra Costa AOR #11119480
Feb 28, 2002
Listing Removed
—
Public Records
May 8, 2001
Sold
$2,437,000
$532/sq ft
Public Records
Jun 7, 1994
Sold
$1,250,000
$273/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$46,752 (+1.7%)
$2,730,787 + $1,427,698
$4,158,485
2024
$45,992 (+1.7%)
$2,677,243 + $1,399,704
$4,076,947
2023
$45,221 (+0.8%)
$2,624,749 + $1,372,259
$3,997,008
2022
$44,857 (+3.1%)
$2,573,284 + $1,345,352
$3,918,636
2021
$43,497 (−0.5%)
$2,522,828 + $1,318,973
$3,841,801
2020
$43,716 (+1.7%)
$2,473,361 + $1,288,209
$3,761,570
2019
$43,001 (+16.4%)
$2,448,000 + $1,275,000
$3,723,000
2018
$36,943 (+1.8%)
$2,400,000 + $1,250,000
$3,650,000
2017
$36,282 (+31.0%)
$2,460,444 + $650,556
$3,111,000
2016
$27,686 (+2.8%)
$2,460,444 + $650,556
$3,111,000
2015
$26,935 (+0.8%)
$1,468,162 + $856,425
$2,324,587
2014
$26,710 (+13.5%)
$1,417,782 + $827,037
$2,244,819
2013
$23,526 (+1.3%)
$1,417,782 + $827,037
$2,244,819
2012
$23,228 (−1.2%)
$1,247,054 + $727,446
$1,974,500
2011
$23,500 (−5.0%)
$1,247,054 + $727,446
$1,974,500
2010
$24,740
$1,263,159 + $736,841
$2,000,000
2009
$24,738 (+1.7%)
$1,346,432 + $785,417
$2,131,849
2008
$24,314
$1,349,631 + $787,283
$2,136,914
Tax history for 3905 Happy Valley Rd
Year
Property tax
Land + Additions
Assessment*
2025
$46,752 (+1.7%)
$2,730,787 + $1,427,698
$4,158,485
2024
$45,992 (+1.7%)
$2,677,243 + $1,399,704
$4,076,947
2023
$45,221 (+0.8%)
$2,624,749 + $1,372,259
$3,997,008
2022
$44,857 (+3.1%)
$2,573,284 + $1,345,352
$3,918,636
2021
$43,497 (−0.5%)
$2,522,828 + $1,318,973
$3,841,801
2020
$43,716 (+1.7%)
$2,473,361 + $1,288,209
$3,761,570
2019
$43,001 (+16.4%)
$2,448,000 + $1,275,000
$3,723,000
2018
$36,943 (+1.8%)
$2,400,000 + $1,250,000
$3,650,000
2017
$36,282 (+31.0%)
$2,460,444 + $650,556
$3,111,000
2016
$27,686 (+2.8%)
$2,460,444 + $650,556
$3,111,000
2015
$26,935 (+0.8%)
$1,468,162 + $856,425
$2,324,587
2014
$26,710 (+13.5%)
$1,417,782 + $827,037
$2,244,819
2013
$23,526 (+1.3%)
$1,417,782 + $827,037
$2,244,819
2012
$23,228 (−1.2%)
$1,247,054 + $727,446
$1,974,500
2011
$23,500 (−5.0%)
$1,247,054 + $727,446
$1,974,500
2010
$24,740
$1,263,159 + $736,841
$2,000,000
2009
$24,738 (+1.7%)
$1,346,432 + $785,417
$2,131,849
2008
$24,314
$1,349,631 + $787,283
$2,136,914
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Nov 18, 2025 • Final
Building - residential mechanical
Install a ductless mini-split system. No electrical work is included. A HERS report may be required at the final inspection.
HVAC
Nov 2, 2023 • Final
Building - residential mechanical
Replace a ducted mini-split system with a 14 SEER unit. A HERS report may be required at the final inspection.
HVAC
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: 13
Exterior
Pool Information
Has Pool
Property Information
Subdivision Name: RANCHO ACALANES
Living Sq. Ft: 4,578
Ground Floor Sq. Ft: 4,578
Building Sq. Ft: 4,578
# of Stories: 1
Legal Description: POR RO ACALANES
Parking & Garage Information
Garage/Parking Sq. Ft: 630
Lot Information
# of Buildings: 1
Land Sq. Ft: 58,370
Acres: 1.34
County Use Description: SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 6
Baths: 6.0
Sq. Ft.: 4,578
Stories: 1.0
Lot Size: 1.34 acres
Style: Single Family Residential
Year Built: 1952
Year Renovated: 1990
County: Contra Costa County
APN: 2461200186
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
10/10 Flood Factor
Estimated 80%+ 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 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
$4.65M – $5.63M
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