21231 Fountain Springs Rd, Diamond Bar, CA 91765

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Off market jul 2024 for $880K

$1,050,966

Est. refi paymentEst. refi $6,479/mo

•

1,576

sq ft

21231 Fountain Springs Rd, Diamond Bar, CA 91765

About this home

Welcome to this inviting single-story home featuring 4 bedrooms and 2 bathrooms, perfect for family living. Recently updated with new windows, the home offers abundant natural light throughout. While the interior retains a dated charm, it provides a wonderful opportunity for you to redesign and personalize according to your tastes. Situated on a usable lot, the property boasts two driveways, one of which offers convenient RV parking. The excellent location in Diamond Bar is a standout feature, with close proximity to a Diamond Bar High School and easy freeway access to both Los Angeles and Orange County, making your commute and travel a breeze. Embrace the potential of this home and create your dream space in a great neighborhood known for its welcoming community and desirable amenities. Don’t miss out on this opportunity to craft your perfect living environment in a prime location.

Single-familyProperty Type

1962Year Built

8,335 sq ftLot Size

$667Est. Price/Sq.Ft.

2 garage spacesParking

Listed by Mark Sapienza •DRE #01733198 • BERKSHIRE HATH HM SVCS CA PROP

Contact: 909-518-3234

Bought with Mark Sapienza •DRE #01733198 • BERKSHIRE HATH HM SVCS CA PROP

Redfin checked: 3 minutes ago

•Source:CRMLS #CV24104800

Redfin Estimate

$1,050,966

$171K since sold in July 2024$1,000 since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 3.2% higher than the average sale price ($1.02M) of 6 comparable homes.

SOLD AUG 19, 2026
$1,238,888
A
4 beds2 baths2,000 sq ft
20995 Glenbrook Dr, Walnut, CA 91789
SOLD FEB 27, 2026
$1,030,000
B
4 beds2 baths1,756 sq ft
2710 Castle Rock Rd, Diamond Bar, CA 91765
SOLD SEP 17, 2026
$930,000
C
3 beds2 baths1,300 sq ft
2726 Castle Rock, Diamond Bar, CA 91765
SOLD APR 7, 2026
$1,080,000
D
4 beds2 baths1,554 sq ft
21415 Running River Ct, Diamond Bar, CA 91765
Century 21 Masters
SOLD JUL 31, 2026
$875,000
E
3 beds2 baths1,300 sq ft
21245 Cold Spg, Diamond Bar, CA 91765
SOLD JUL 16, 2026
$958,600
F
3 beds2 baths1,372 sq ft
2127 Evergreen Springs Dr, Diamond Bar, CA 91765
Keller Williams Premier Prop

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Earn from this home

Sell

$317,945

Est. take-home

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Refinance

Est. cash available

Get cash now or lower your monthly rate

Rent

$3,448/mo

Redfin rental estimate

List your home for rent

Market trends in 91765, CA

Last updated September 2026

Buyer's Market

Seller's Market

Balanced market

Sale-to-List Price

98.5%

0.6% MoM

Median sale price

$1.1M

$10K MoM

Avg. days on market

43d

1 days MoM

Recently sold homes

8 MoM

New listings for sale

COMING SOON
$2,068,000
5 beds5 baths4,725 sq ft
23553 Canyon Vista Ct, Diamond Bar, CA 91765
$675,000
3 beds2 baths989 sq ft
23516 Deer Spring Ln, Diamond Bar, CA 91765
$1,780,000
5 beds3.5 baths3,453 sq ft
3125 S Ridge Point Dr, Diamond Bar, CA 91765
ReMax 2000 Realty
$899,000
3 beds2 baths1,274 sq ft
22922 Dry Crk, Diamond Bar, CA 91765
HOT HOME
$948,000
3 beds3 baths1,552 sq ft
24271 Seagreen Dr, Diamond Bar, CA 91765
K.W. EXECUTIVE
$4,000,000
6 beds5 baths5,797 sq ft
1809 Diamond Knl, Diamond Bar, CA 91765
$1,480,000
5 beds3 baths2,447 sq ft
1667 Cypress Grove Ln, Diamond Bar, CA 91765
$1,170,000
4 beds2.5 baths2,154 sq ft
1029 Twin Cyn, Diamond Bar, CA 91765
FOR SALE BY OWNER
$1,200,000
3 beds2 baths1,339 sq ft
512 Armitos Pl, Diamond Bar, CA 91765
$1,499,900
5 beds3 baths3,203 sq ft
24215 Delta Dr, Diamond Bar, CA 91765
See all

Provided by Redfin

Sale history for 21231 Fountain Springs Rd

Year

Property tax

Land + Additions

Assessment*

2025

$11,874 (+621.0%)

$789,582 + $178,398

$967,980

2024

$1,647 (+2.0%)

$774,100 + $174,900

$949,000

2023

$1,615 (+2.3%)

$30,836 + $62,356

$93,192

2022

$1,579 (+2.3%)

$30,232 + $61,134

$91,366

2021

$1,543 (+1.1%)

$29,640 + $59,936

$89,576

2020

$1,526 (+1.7%)

$29,059 + $58,761

$87,820

2019

$1,500 (+10.0%)

$28,762 + $58,159

$86,921

2018

$1,363 (−8.2%)

$28,199 + $57,019

$85,218

2017

$1,485 (+3.6%)

$27,105 + $70,655

$97,760

2016

$1,433 (−0.2%)

$27,105 + $70,655

$97,760

2015

$1,436 (−0.6%)

$26,574 + $69,270

$95,844

2014

$1,444 (+2.1%)

$25,663 + $66,894

$92,557

2012

$1,415 (+3.0%)

$25,548 + $66,592

$92,140

2011

$1,374 (+1.2%)

$25,048 + $65,287

$90,335

2010

$1,358 (+1.5%)

$24,557 + $64,007

$88,564

2009

$1,339 (+3.6%)

$24,374 + $63,529

$87,903

2008

$1,293

$24,432 + $63,680

$88,112

Tax history for 21231 Fountain Springs Rd

Year

Property tax

Land + Additions

Assessment*

2025

$11,874 (+621.0%)

$789,582 + $178,398

$967,980

2024

$1,647 (+2.0%)

$774,100 + $174,900

$949,000

2023

$1,615 (+2.3%)

$30,836 + $62,356

$93,192

2022

$1,579 (+2.3%)

$30,232 + $61,134

$91,366

2021

$1,543 (+1.1%)

$29,640 + $59,936

$89,576

2020

$1,526 (+1.7%)

$29,059 + $58,761

$87,820

2019

$1,500 (+10.0%)

$28,762 + $58,159

$86,921

2018

$1,363 (−8.2%)

$28,199 + $57,019

$85,218

2017

$1,485 (+3.6%)

$27,105 + $70,655

$97,760

2016

$1,433 (−0.2%)

$27,105 + $70,655

$97,760

2015

$1,436 (−0.6%)

$26,574 + $69,270

$95,844

2014

$1,444 (+2.1%)

$25,663 + $66,894

$92,557

2012

$1,415 (+3.0%)

$25,548 + $66,592

$92,140

2011

$1,374 (+1.2%)

$25,048 + $65,287

$90,335

2010

$1,358 (+1.5%)

$24,557 + $64,007

$88,564

2009

$1,339 (+3.6%)

$24,374 + $63,529

$87,903

2008

$1,293

$24,432 + $63,680

$88,112

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

Public record

Public record
Zoning

Beds

Baths

Stories

—

Lot width

—

Lot depth

—

Lot size

8,335 Sq. Ft.

Year renovated

1963

Sq. Ft.

1,288

Year built

1962

Style

Single Family Residential

County

Los Angeles County

APN

8285002020

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Oct 6, 2026.

RLM

Low/Medium Density Residential District

The RLM zoning district is intended primarily for existing subdivided areas developed with detached single-family dwellings. The maximum allowed density for new residential subdivisions within this zoning district will be five dwellings per gross acre. The RLM zoning district is consistent with the low density residential land use category of the general plan.

Permitted uses

Include but are not limited to:

Housing-Single unit
Housing-Senior
Housing-Other
Infrastructure
Fire house
Police station
Park & open space

Property details

Parking

Parking / Garage Information
Uncovered Spaces: 3
Attached Garage
# of Garage Spaces: 2
Driveway
Has Parking
# of Parking Spaces: 5

Interior

Laundry Information
Has Laundry
Gas & Electric Dryer Hookup, In Garage, Individual Room

Kitchen Information
Appliances: Built In Range, Electric Oven
Has Appliances
Laminate Counters

Bathroom Information
# of Baths (Full): 2
Walk-in shower

Cooling Information
Central
Has Cooling

Room Information
All Bedrooms Down

Fireplace Information
Family Room
Has Fireplace

Flooring Information
Carpet, Vinyl

Heating Information
Central Furnace
Has Heating

Interior Features
Entry Level: 1
Entry Location: 1
Block Walls
Levels: One
Main Level Bathrooms: 2
Main Level Bedrooms: 4

Exterior

Exterior Information
Structure Type: House
Roof: Composition
Fencing: Masonry
Has Fence
Construction Materials: Stucco, Wood

Foundation Information
No

Exterior Features
Patio And Porch Features: Concrete, Covered
Has Patio
Pool Features: None

Lot Information
Elevation Units: Feet
Lot Size Source: Assessor's Data
Lot Features: Back Yard

Property Information
Total # of Units: 1
Common Walls: No Common Walls
Direction Faces: South
Parcel Number: 8285002020
Total # of Stories: 1
Has View
Year Built Source: Assessor

Financial

Assesments Information
Assessments: Unknown

Utilities

Utilities Information
Electric: Standard
Sewer: Public Sewer
Cable Available, Electricity Available, Natural Gas Available, Telephone - In Street, Sewer Connected
Water Source: District/Public

Location

Neighborhood Information
Community Features: Curbs, Sidewalks

School Information
High School: Diamond Bar
High School District: Walnut Valley Unified
High School 2: DIABAR

Location Information
Directions: Brea Canyon Rd to Fountain Springs Rd
Road Frontage Type: Access via City Streets
Road Surface Type: Paved
Zoning: LCR171/2

Public facts

Beds: 4
Baths: 2.0
Sq. Ft.: 1,288
Stories: —
Lot Size: 8,335 square feet
Style: Single Family Residential
Year Built: 1962
Year Renovated: 1963
County: Los Angeles County
APN: 8285002020

Home facts updated by county records on Oct 6, 2026

Other

Listing Information
IDX Contact Info: 909-518-3234
Days Active in MLS: 19
Continuous Days Active in MLS: 19

Listing Agent Information
List Agent First Name: Mark
List Agent Last Name: Sapienza

Listing Office Information
List Office Name: BERKSHIRE HATH HM SVCS CA PROP

Selling Agent Information
Buyer Agent First Name: Mark
Buyer Agent Last Name: Sapienza

Selling Office Information
Buyer Office Name: BERKSHIRE HATH HM SVCS CA PROP

Around this home

Schools

Evergreen Elementary School

Public K-5 • Assigned • 0.3mi

9/10

Chaparral Middle School

Public 6-8 • Assigned • 1.7mi

10/10

Diamond Bar High School

Public 9-12 • Assigned • 0.2mi

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

5/10 Fire Factor

3% chance of being in a wildfire in next 30 years

6/10 Heat Factor

7 days above 98° expected this year, 21 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

6/10 Air Factor

10 unhealthy days expected this year, 13 days in 30 years

Provided by First Street

Historical weather

Diamond Bar, CA • 91765

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 9.5 hours in June and 6.9 hours in December, placing it above the U.S. average for solar exposure.

9.5 hrs

6.9 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$999,000 – $1.21M

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Nearby similar homes

$1,780,000

5 beds3.5 baths3,453 sq ft

3125 S Ridge Point Dr, Diamond Bar, CA 91765

ReMax 2000 Realty

$6,980,000

6 beds6.5 baths11,000 sq ft

2855 Oak Knoll Dr, Diamond Bar, CA 91765

Country Queen Real Estate

$1,199,900

4 beds4 baths1,810 sq ft

21325 Hipass Dr, Diamond Bar, CA 91765

$1,455,000

4 beds2.5 baths2,265 sq ft

20512 Starshine, Walnut, CA 91789

$1,385,000

4 beds2.5 baths2,265 sq ft

20400 Lake Canyon Dr, Walnut, CA 91789

New Century Realtors

$995,000

4 beds2 baths1,521 sq ft

3525 Castle Rock, Diamond Bar, CA 91765

New listings for sale in 91765

COMING SOON

$2,068,000

5 beds5 baths4,725 sq ft

23553 Canyon Vista Ct, Diamond Bar, CA 91765

$675,000

3 beds2 baths989 sq ft

23516 Deer Spring Ln, Diamond Bar, CA 91765

$1,780,000

5 beds3.5 baths3,453 sq ft

3125 S Ridge Point Dr, Diamond Bar, CA 91765

ReMax 2000 Realty

$899,000

3 beds2 baths1,274 sq ft

22922 Dry Crk, Diamond Bar, CA 91765

HOT HOME

$948,000

3 beds3 baths1,552 sq ft

24271 Seagreen Dr, Diamond Bar, CA 91765

K.W. EXECUTIVE

$4,000,000

6 beds5 baths5,797 sq ft

1809 Diamond Knl, Diamond Bar, CA 91765

$1,480,000

5 beds3 baths2,447 sq ft

1667 Cypress Grove Ln, Diamond Bar, CA 91765

$1,170,000

4 beds2.5 baths2,154 sq ft

1029 Twin Cyn, Diamond Bar, CA 91765

FOR SALE BY OWNER

$1,200,000

3 beds2 baths1,339 sq ft

512 Armitos Pl, Diamond Bar, CA 91765

Home values near 21231 Fountain Springs Rd

Data from public records.

Address	Redfin Estimate
21237 Fountain Springs Road, Diamond Bar, CA 3 Beds \| 2 Baths \| 1300 Sq. Ft.	$859,389
21209 Fountain Springs Road, Diamond Bar, CA 3 Beds \| 2 Baths \| 1280 Sq. Ft.	$851,150

Address	Redfin Estimate
21223 Fountain Springs Road, Diamond Bar, CA 3 Beds \| 2 Baths \| 1300 Sq. Ft.	$1,015,582
21313 Fountain Springs Road, Diamond Bar, CA 4 Beds \| - Baths \| 1376 Sq. Ft.	$955,021

Address	Redfin Estimate
21217 Fountain Springs Road, Diamond Bar, CA 4 Beds \| 2 Baths \| 1475 Sq. Ft.	$896,215
21307 Fountain Springs Road, Diamond Bar, CA 3 Beds \| 2 Baths \| 1760 Sq. Ft.	$1,100,176

Property information provided by CRMLS when last listed in 2024. This data may not match . Learn more.

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 91765, CA

Sale history for 21231 Fountain Springs Rd

Tax history for 21231 Fountain Springs Rd

Public record

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 91765

Home values near 21231 Fountain Springs Rd

More real estate resources