Google street view image for 3947 Happy Valley Rd, Lafayette, CA 94549

Off market aug 2023 for $13M

$12,573,345

Est. refi paymentEst. refi $92,299/mo

•

6 ba

•

5,588

sq ft

3947 Happy Valley Rd, Lafayette, CA 94549

About this home

3947 Happy Valley Rd is a 5,588 square foot house on a 1.51 acre lot with 4 bedrooms and 6 bathrooms. - it last sold on August 30, 2023 for $13,690,000. Based on Redfin's Lafayette data, we estimate the home's value is $12,573,345.

Single-familyProperty Type

1996Year Built

1.51 acresLot Size

$2,250Est. Price/Sq.Ft.

5 car garageParking

Source:Public Records

Redfin Estimate

$12,573,345

$1.1M since sold in August 2023$433K since October

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 172.5% higher than the average sale price ($4.61M) of 6 comparable homes.

SOLD NOV 3, 2026
$8,125,000
A
6 beds5.5 baths5,740 sq ft
3937 Happy Valley Rd, Lafayette, CA 94549
SOLD JUL 20, 2026
$3,570,000
B
6 beds5 baths5,755 sq ft
1 Gardiner Ct, Orinda, CA 94563
SOLD NOV 6, 2026
$2,769,000
C
5 beds4.5 baths4,986 sq ft
4120 Happy Valley Rd, Lafayette, CA 94549
SOLD MAY 11, 2026
1248 Upper Happy Valley Rd, Lafayette, CA 94549
$4,295,000
D
5 beds4.5 baths4,830 sq ft
1248 Upper Happy Valley Rd, Lafayette, CA 94549
SOLD JUN 25, 2026
$3,475,000
E
5 beds4.5 baths3,900 sq ft
1059 Lizann Dr, Lafayette, CA 94549
SOLD OCT 1, 2026
$5,450,000
F
5 beds4.5 baths6,045 sq ft
42 Charles Hill Cir, Orinda, CA 94563

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Earn from this home

Sell

$1,611,244

Est. take-home

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Refinance

Est. cash available

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Rent

$9,729/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

COMING SOON
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
1175 Oleander Dr, Lafayette, CA 94549
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 3947 Happy Valley Rd

Year

Property tax

Land + Additions

Assessment*

2026

$160,261 (+4.0%)

$10,404,000 + $4,129,076

$14,533,076

2025

$154,054 (+1.7%)

$10,404,000 + $4,129,076

$14,533,076

2024

$151,510 (+16.0%)

$10,200,000 + $3,763,800

$13,963,800

2023

$130,560 (+1.3%)

$10,000,000 + $3,690,000

$13,690,000

2022

$128,914 (+169.8%)

$8,160,000 + $3,570,000

$11,730,000

2021

$47,776 (−0.4%)

$8,000,000 + $3,500,000

$11,500,000

2020

$47,956 (+1.6%)

$2,555,888 + $1,599,330

$4,155,218

2019

$47,196 (+3.7%)

$2,529,681 + $1,582,931

$4,112,612

2018

$45,524 (+1.8%)

$2,480,080 + $1,551,894

$4,031,974

2017

$44,716 (+1.8%)

$2,383,776 + $1,491,633

$3,875,409

2016

$43,938 (+2.8%)

$2,383,776 + $1,491,633

$3,875,409

2015

$42,757 (+0.8%)

$2,337,036 + $1,462,386

$3,799,422

2014

$42,431 (+14.5%)

$2,256,841 + $1,412,205

$3,669,046

2013

$37,069 (+1.2%)

$2,256,841 + $1,412,205

$3,669,046

2012

$36,621 (+5.9%)

$2,000,000 + $1,208,310

$3,208,310

2011

$34,575 (−10.5%)

$2,000,000 + $1,200,000

$3,200,000

2010

$38,626 (+8.1%)

$1,854,448 + $1,145,552

$3,000,000

2009

$35,740 (−0.8%)

$2,092,745 + $1,292,755

$3,385,500

2008

$36,046

$1,932,335 + $1,193,665

$3,126,000

Tax history for 3947 Happy Valley Rd

Year

Property tax

Land + Additions

Assessment*

2026

$160,261 (+4.0%)

$10,404,000 + $4,129,076

$14,533,076

2025

$154,054 (+1.7%)

$10,404,000 + $4,129,076

$14,533,076

2024

$151,510 (+16.0%)

$10,200,000 + $3,763,800

$13,963,800

2023

$130,560 (+1.3%)

$10,000,000 + $3,690,000

$13,690,000

2022

$128,914 (+169.8%)

$8,160,000 + $3,570,000

$11,730,000

2021

$47,776 (−0.4%)

$8,000,000 + $3,500,000

$11,500,000

2020

$47,956 (+1.6%)

$2,555,888 + $1,599,330

$4,155,218

2019

$47,196 (+3.7%)

$2,529,681 + $1,582,931

$4,112,612

2018

$45,524 (+1.8%)

$2,480,080 + $1,551,894

$4,031,974

2017

$44,716 (+1.8%)

$2,383,776 + $1,491,633

$3,875,409

2016

$43,938 (+2.8%)

$2,383,776 + $1,491,633

$3,875,409

2015

$42,757 (+0.8%)

$2,337,036 + $1,462,386

$3,799,422

2014

$42,431 (+14.5%)

$2,256,841 + $1,412,205

$3,669,046

2013

$37,069 (+1.2%)

$2,256,841 + $1,412,205

$3,669,046

2012

$36,621 (+5.9%)

$2,000,000 + $1,208,310

$3,208,310

2011

$34,575 (−10.5%)

$2,000,000 + $1,200,000

$3,200,000

2010

$38,626 (+8.1%)

$1,854,448 + $1,145,552

$3,000,000

2009

$35,740 (−0.8%)

$2,092,745 + $1,292,755

$3,385,500

2008

$36,046

$1,932,335 + $1,193,665

$3,126,000

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

Permits

Dec 2, 2025 • Active

Building/residential/r/adu-2nd unit

Construct a new two-bedroom, two-bathroom accessory dwelling unit with a deck, a four-car garage, and storage space. Demolish an existing non-conforming garage and perform related paving and grading work.

Addition

ADU

Grading

Oct 7, 2025 • Final

Building/grading/gl/grading lafayette

Perform grading work for a new detached accessory dwelling unit. The work includes cutting and filling soil to prepare the site.

ADU

Grading

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: ACALANES RHO
Living Sq. Ft: 5,588
Ground Floor Sq. Ft: 2,665
Building Sq. Ft: 5,588
# of Stories: 2
Legal Description: RO ACALANES 1.51 AC

Lot Information
# of Buildings: 1
Land Sq. Ft: 65,776
Acres: 1.51
County Use Description: SINGLE FAMILY

Financial

Assessor Information
Assessment Year: 2026

Public facts

Beds: 4
Baths: 6.0
Sq. Ft.: 5,588
Stories: 2.0
Lot Size: 1.51 acres
Style: Single Family Residential
Year Built: 1996
Year Renovated: 2015
County: Contra Costa County
APN: 2461200129

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 • 0.3mi

8/10

M. H. Stanley Middle School

Public 6-8 • Assigned • 2.3mi

8/10

Acalanes High School

Public 9-12 • Assigned • 2.8mi

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°

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

$11.95M – $14.46M

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Home values near 3947 Happy Valley Rd

Data from public records.

Address	Redfin Estimate
3900 Happy Valley Rd, Lafayette, CA 5 Beds \| 4 Baths \| 3537 Sq. Ft.	$2,897,076
3957 Happy Valley Rd, Lafayette, CA 4 Beds \| 3 Baths \| 3440 Sq. Ft.	$3,857,929
3937 Happy Valley Rd, Lafayette, CA 6 Beds \| 5.5 Baths \| 5740 Sq. Ft.	$7,500,708
3975 Happy Valley Rd, Lafayette, CA 5 Beds \| 5 Baths \| 6254 Sq. Ft.	$6,022,776
3969 Happy Valley Rd, Lafayette, CA 4 Beds \| 3 Baths \| 2773 Sq. Ft.	$2,872,565
3913 Happy Valley Rd, Lafayette, CA 5 Beds \| 5 Baths \| 5820 Sq. Ft.	$4,468,242
3920 Happy Valley Rd, Lafayette, CA 4 Beds \| 3.5 Baths \| 3902 Sq. Ft.	$3,045,858

Address	Redfin Estimate
3915 Happy Valley Rd, Lafayette, CA 6 Beds \| 8 Baths \| 9335 Sq. Ft.	$8,653,486
3938 Happy Valley Rd, Lafayette, CA 5 Beds \| 5.5 Baths \| - Sq. Ft.	$4,505,378
3959 Happy Valley Rd, Lafayette, CA 4 Beds \| 5 Baths \| 4408 Sq. Ft.	$5,217,625
3983 Happy Valley Rd, Lafayette, CA 5 Beds \| 6 Baths \| 5775 Sq. Ft.	$6,319,787
3981 Happy Valley Rd, Lafayette, CA 5 Beds \| 5 Baths \| 4734 Sq. Ft.	$3,541,756
3907 Happy Valley Rd, Lafayette, CA 5 Beds \| 3.5 Baths \| 3890 Sq. Ft.	$4,110,834
3993 Happy Valley Rd, Lafayette, CA 3 Beds \| 5 Baths \| 4823 Sq. Ft.	$4,195,568

Address	Redfin Estimate
3955 Happy Valley Rd, Lafayette, CA 7 Beds \| 8.5 Baths \| 13737 Sq. Ft.	$7,099,206
3936 Happy Valley Rd, Lafayette, CA 5 Beds \| 5.5 Baths \| 4937 Sq. Ft.	$6,186,875
3965 Happy Valley Rd, Lafayette, CA 5 Beds \| 4 Baths \| 3726 Sq. Ft.	$4,026,428
16 Happy Valley Rd, Lafayette, CA 4 Beds \| 3 Baths \| 3885 Sq. Ft.	$3,739,144
3991 Happy Valley Rd, Lafayette, CA 7 Beds \| 6 Baths \| 7403 Sq. Ft.	$6,927,488
3903 Happy Valley Rd, Lafayette, CA 4 Beds \| 5 Baths \| 4177 Sq. Ft.	$4,534,026
3941 Happy Valley Rd, Lafayette, CA 4 Beds \| 5.5 Baths \| 8620 Sq. Ft.	$7,791,093

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About this home

Redfin Estimate

Earn from this home

Market trends in 94549, CA

Sale history for 3947 Happy Valley Rd

Tax history for 3947 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 3947 Happy Valley Rd

More real estate resources