Google street view image for 3815 Happy Valley Rd, Lafayette, CA 94549

Off market aug 2010 for $2.7M

$5,371,414

Est. refi paymentEst. refi $15,833/mo

•

5 ba

•

4,925

sq ft

3815 Happy Valley Rd, Lafayette, CA 94549

About this home

3815 Happy Valley Rd is a 4,925 square foot house on a 1.23 acre lot with 4 bedrooms and 5 bathrooms. - it last sold on August 11, 2010 for $2,795,000. Based on Redfin's Lafayette data, we estimate the home's value is $5,371,414.

Single-familyProperty Type

1938Year Built

1.23 acresLot Size

$1,091Est. Price/Sq.Ft.

4 car garageParking

Source:Public Records

Redfin Estimate

$5,371,414

$2.6M since sold in August 2010$362K since October

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 33.9% higher than the average sale price ($4.01M) of 6 comparable homes.

SOLD AUG 21, 2026
$4,250,000
A
4 beds3.5 baths3,399 sq ft
3814 Happy Valley Rd, Lafayette, CA 94549
SOLD AUG 26, 2026
$4,800,000
B
4 beds3.5 baths4,033 sq ft
3954 S Peardale Dr, Lafayette, CA 94549
SOLD JUL 9, 2026
$4,800,000
C
4 beds3.5 baths4,511 sq ft
1165 Glen Rd, Lafayette, CA 94549
SOLD NOV 14, 2025
$4,250,000
D
4 beds4.5 baths4,502 sq ft
1133 Estates Dr, Lafayette, CA 94549
SOLD AUG 18, 2026
$2,600,000
E
3 beds3 baths3,475 sq ft
1066 Dolores Dr, Lafayette, CA 94549
SOLD OCT 15, 2026
$3,375,000
F
3 beds3 baths2,686 sq ft
1232 Upper Happy Vly, Lafayette, CA 94549

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Earn from this home

Sell

$3,745,415

Est. take-home

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Refinance

Est. cash available

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Rent

$9,651/mo

Redfin rental estimate

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Market trends in 94549, CA

Last updated October 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-list price

102.4%

+1.0% MoM

Median sale price

$1.8M

$948 MoM

Avg. days on market

17d

0 days MoM

Recently sold homes

1 MoM

New listings for sale

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1003 Woodbury Rd #104, Lafayette, CA 94549
$1,092,000
2 beds2 baths1,110 sq ft
1003 Woodbury Rd #104, Lafayette, CA 94549
COMING SOON
$1,299,000
3 beds2 baths1,651 sq ft
490 Florence Dr, Lafayette, CA 94549
OPEN TODAY, 1PM TO 4PM
$1,495,000
3 beds2 baths1,670 sq ft
3241 Judith Ln, Lafayette, CA 94549
3D WALKTHROUGH
$2,895,000
4 beds4.5 baths4,225 sq ft
3370 Stage Coach Dr, Lafayette, CA 94549
OPEN TODAY, 1PM TO 4PM
$2,975,000
4 beds3 baths2,619 sq ft
4022 Happy Valley Rd, Lafayette, CA 94549
3D WALKTHROUGH
$999,000
3 beds3 baths2,443 sq ft
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OPEN TODAY, 2PM TO 4PM
$2,695,000
5 beds3 baths2,484 sq ft
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See all

Provided by Redfin

Sale history for 3815 Happy Valley Rd

Year

Property tax

Land + Additions

Assessment*

2026

$43,760 (+2.4%)

$1,787,695 + $2,023,166

$3,810,861

2025

$42,718 (+1.7%)

$1,787,695 + $2,023,166

$3,810,861

2024

$42,002 (+1.7%)

$1,752,643 + $1,983,497

$3,736,140

2023

$41,303 (+1.5%)

$1,718,278 + $1,944,605

$3,662,883

2022

$40,678 (+3.0%)

$1,684,587 + $1,906,476

$3,591,063

2021

$39,502 (−0.6%)

$1,651,556 + $1,869,095

$3,520,651

2020

$39,750 (+1.7%)

$1,619,173 + $1,832,447

$3,451,620

2019

$39,069 (+3.7%)

$1,602,571 + $1,813,658

$3,416,229

2018

$37,686 (+1.7%)

$1,571,149 + $1,778,097

$3,349,246

2017

$37,040 (+1.7%)

$1,510,141 + $1,709,052

$3,219,193

2016

$36,405 (+2.7%)

$1,510,141 + $1,709,052

$3,219,193

2015

$35,435 (+1.4%)

$1,480,531 + $1,675,542

$3,156,073

2014

$34,953 (+1.0%)

$1,429,728 + $1,597,746

$3,027,474

2013

$34,594 (+4.6%)

$1,429,728 + $1,597,746

$3,027,474

2012

$33,078 (+3.4%)

$1,423,267 + $1,590,526

$3,013,793

2011

$31,979 (+240.0%)

$1,395,360 + $1,514,440

$2,909,800

2010

$9,407 (+0.8%)

$1,368,000 + $1,427,000

$2,795,000

2009

$9,328 (+2.6%)

$80,705 + $680,351

$761,056

2008

$9,093

$80,897 + $681,968

$762,865

Tax history for 3815 Happy Valley Rd

Year

Property tax

Land + Additions

Assessment*

2026

$43,760 (+2.4%)

$1,787,695 + $2,023,166

$3,810,861

2025

$42,718 (+1.7%)

$1,787,695 + $2,023,166

$3,810,861

2024

$42,002 (+1.7%)

$1,752,643 + $1,983,497

$3,736,140

2023

$41,303 (+1.5%)

$1,718,278 + $1,944,605

$3,662,883

2022

$40,678 (+3.0%)

$1,684,587 + $1,906,476

$3,591,063

2021

$39,502 (−0.6%)

$1,651,556 + $1,869,095

$3,520,651

2020

$39,750 (+1.7%)

$1,619,173 + $1,832,447

$3,451,620

2019

$39,069 (+3.7%)

$1,602,571 + $1,813,658

$3,416,229

2018

$37,686 (+1.7%)

$1,571,149 + $1,778,097

$3,349,246

2017

$37,040 (+1.7%)

$1,510,141 + $1,709,052

$3,219,193

2016

$36,405 (+2.7%)

$1,510,141 + $1,709,052

$3,219,193

2015

$35,435 (+1.4%)

$1,480,531 + $1,675,542

$3,156,073

2014

$34,953 (+1.0%)

$1,429,728 + $1,597,746

$3,027,474

2013

$34,594 (+4.6%)

$1,429,728 + $1,597,746

$3,027,474

2012

$33,078 (+3.4%)

$1,423,267 + $1,590,526

$3,013,793

2011

$31,979 (+240.0%)

$1,395,360 + $1,514,440

$2,909,800

2010

$9,407 (+0.8%)

$1,368,000 + $1,427,000

$2,795,000

2009

$9,328 (+2.6%)

$80,705 + $680,351

$761,056

2008

$9,093

$80,897 + $681,968

$762,865

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Permits

Aug 14, 2013 • Final

Building/residential/mir/miscellaneous residential

Construct a new outdoor fireplace, seat walls, and a barbecue area according to the provided plans.

Remodel

Jun 4, 2013 • Final

Building/residential/p/pool

Remodel an existing swimming pool and add a new spa. Replace the concrete patio.

Pool and hot tub

Remodel

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: 4,925
Ground Floor Sq. Ft: 4,925
Building Sq. Ft: 4,925
# of Stories: 1
Legal Description: POR RO ACALANES

Parking & Garage Information
Garage/Parking Sq. Ft: 775

Lot Information
# of Buildings: 1
Land Sq. Ft: 53,579
Acres: 1.23
County Use Description: SINGLE FAMILY

Financial

Assessor Information
Assessment Year: 2026

Public facts

Beds: 4
Baths: 5.0
Sq. Ft.: 4,925
Stories: 1.0
Lot Size: 1.23 acres
Style: Single Family Residential
Year Built: 1938
Year Renovated: 1979
County: Contra Costa County
APN: 2440100044

Home facts updated by county records on Oct 30, 2026

Around this home

Schools

K - 12
Preschool & daycare

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°

81°

56°

87°

58°

81°

60°

72°

54°

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

$5.10M – $6.18M

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Home values near 3815 Happy Valley Rd

Data from public records.

Address	Redfin Estimate
3827 Happy Valley Road, Lafayette, CA 3 Beds \| 3 Baths \| 3165 Sq. Ft.	$2,956,942
3820 Happy Valley Road, Lafayette, CA 6 Beds \| - Baths \| 9281 Sq. Ft.	$9,412,865
3828 Happy Valley Road, Lafayette, CA 5 Beds \| 6.5 Baths \| 7500 Sq. Ft.	$7,779,398
3794 Happy Valley Road, Lafayette, CA 1 Beds \| 2 Baths \| 834 Sq. Ft.	$2,348,496
3838 Palo Alto Drive, Lafayette, CA 4 Beds \| 3 Baths \| 3440 Sq. Ft.	$3,905,408
3842 Palo Alto Drive, Lafayette, CA 4 Beds \| 5 Baths \| 4293 Sq. Ft.	$5,288,072
3822 Palo Alto Drive, Lafayette, CA 6 Beds \| 4 Baths \| 4984 Sq. Ft.	$3,806,045

Address	Redfin Estimate
3808 Happy Valley Road, Lafayette, CA 4 Beds \| 4 Baths \| 5596 Sq. Ft.	$4,799,921
3814 Happy Valley Road, Lafayette, CA 4 Beds \| 3.5 Baths \| 3399 Sq. Ft.	$4,457,310
3829 Happy Valley Road, Lafayette, CA 4 Beds \| 4 Baths \| 4820 Sq. Ft.	$4,729,473
3792 Happy Valley Road, Lafayette, CA 3 Beds \| 4 Baths \| 3247 Sq. Ft.	$3,411,855
3834 Palo Alto Drive, Lafayette, CA 4 Beds \| 4 Baths \| 4978 Sq. Ft.	$4,424,264
1208 Cambridge Drive, Lafayette, CA 4 Beds \| 3 Baths \| 2738 Sq. Ft.	$2,269,059
3850 Palo Alto Drive, Lafayette, CA 4 Beds \| 3 Baths \| 2972 Sq. Ft.	$2,747,188

Address	Redfin Estimate
3806 Happy Valley Road, Lafayette, CA 4 Beds \| 5 Baths \| 3776 Sq. Ft.	$3,108,835
3825 Happy Valley Road, Lafayette, CA 4 Beds \| 4 Baths \| 4804 Sq. Ft.	$4,013,666
3809 Happy Valley Road, Lafayette, CA 3 Beds \| 4 Baths \| 4368 Sq. Ft.	$5,374,822
3829 Happy Valley Road, Lafayette, CA 4 Beds \| 4 Baths \| 4820 Sq. Ft.	$4,358,493
3826 Palo Alto Drive, Lafayette, CA 6 Beds \| 5 Baths \| 5352 Sq. Ft.	$4,932,215
1216 Cambridge Drive, Lafayette, CA 4 Beds \| 4 Baths \| 3029 Sq. Ft.	$3,242,564
3810 Palo Alto Drive, Lafayette, CA 4 Beds \| 3 Baths \| 2837 Sq. Ft.	$2,930,621

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About this home

Redfin Estimate

Earn from this home

Market trends in 94549, CA

Sale history for 3815 Happy Valley Rd

Tax history for 3815 Happy Valley Rd

Permits

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 94549

Home values near 3815 Happy Valley Rd

More real estate resources