OFF MARKET

Off Market Feb 2008 for $1.6M

$3,042,031

Est. refi paymentEst. refi $10,897/mo

•

3,345

sq ft

430 Mapleton Ave, Boulder, CO 80302

About this home

Public Remarks: The Duncan House, one of the first homes in Boulder, is offered for sale for the first time in almost 50 years. Beautiful Mapleton Hill home w/exquisite organic gardens sits on the large lot. Carriage house/Studio, 858 sq ft (not included in the total sq ftg) has 1.5 baths, vaults, skylights etc. The turn-of-the-century architecture is exquisite. This stately proud home has been lovingly maintained by the family. An original Boulder treasure & a must see for those who love the past. Sold As Is

Single-familyProperty Type

1892Year Built

0.32 acresLot Size

$909Est. Price/Sq.Ft.

Listed by Jo Kearney • Kearney Realty

Contact: 3034406464

Bought with • LIV Sotheby's Intl Realty

•303-443-6161 (broker)

Redfin checked: a minute ago

•Source:IRES as Distributed by MLS Grid #532782

Redfin Estimate

$3,042,031

$1.4M since sold in February 2008$59K since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 45.1% higher than the average sale price ($2.10M) of 6 comparable homes.

SOLD AUG 27, 2026
$3,295,000
A
4 beds3 baths2,463 sq ft
1013 Mapleton Ave, Boulder, CO 80304
SOLD SEP 1, 2026
$2,150,000
B
4 beds2.5 baths2,680 sq ft
1730 Bluff St, Boulder, CO 80304
SOLD JUN 12, 2026
$1,544,000
C
4 beds3 baths2,484 sq ft
1020 Portland Pl, Boulder, CO 80304
SOLD AUG 14, 2026
$2,100,000
D
5 beds4 baths3,034 sq ft
320 Pearl St, Boulder, CO 80302
SOLD SEP 15, 2026
$1,275,000
E
5 beds3 baths2,479 sq ft
1344 6th St, Boulder, CO 80302
SOLD AUG 5, 2026
$2,215,000
F
3 beds2 baths2,104 sq ft
3133 5th St, Boulder, CO 80304

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Earn from this home

Sell

$2,199,334

Est. take-home

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Refinance

Est. cash available

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Rent

$6,502/mo

Redfin rental estimate

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Market trends in 80302, CO

Last updated August 2026

Buyer's Market

Seller's Market

Buyer's market

Sale-to-List Price

95.3%

0.4% MoM

Median sale price

$1.1M

$64K MoM

Avg. days on market

64d

4 days MoM

Recently sold homes

4 MoM

New listings for sale

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NEW 1 HR AGO
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OPEN SAT, 10AM TO 12PM
$875,000
3 beds2.5 baths1,512 sq ft
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COMING SOON
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COMING SOON
$2,250,000
5 beds3.5 baths3,926 sq ft
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OPEN SUN, 11AM TO 2PM
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Cassidy Bednark • Century 21 Elevated Real Estate
OPEN SAT, 1PM TO 3PM
$1,485,000
4 beds2.5 baths3,623 sq ft
1461 Zamia Ave, Boulder, CO 80304
$80,000
3 beds1 bath980 sq ft
4500 19th St #610, Boulder, CO 80304
Jennifer Walthall • Metro 21 Real Estate Group
3D WALKTHROUGH
$595,000
2 beds2 baths892 sq ft
948 North St #17, Boulder, CO 80304
$300,000
1 bed1 bath400 sq ft
2711 Mapleton Ave #1, Boulder, CO 80304
See all

Provided by Redfin

Sale history for 430 Mapleton Ave

Date

Event

Price

REDFIN #1

Jun 17, 2026

Rental Removed

$8,500

$3/sq ft

May 4, 2025

Listed for Rent

$8,500

$3/sq ft

IRES as Distributed by MLS Grid #532782

Feb 8, 2008

Sold

$1,600,000

$478/sq ft

May 21, 2007

Listed

$1,750,000

$523/sq ft

REColorado as Distributed by MLS Grid #412047

Dec 24, 2007

Listing Removed

—

Aug 23, 2006

Listed

$1,750,000

$523/sq ft

IRES as Distributed by MLS Grid #505076

May 20, 2007

Listing Removed

—

Aug 20, 2006

Listed

$1,950,000

$583/sq ft

Public Records

Jan 3, 1990

Sold

$10,000

$3/sq ft

Public Records

Mar 24, 1958

Sold

$143,000

$43/sq ft

Join or sign in to view all info

Year

Property tax

Land + Additions

Assessment*

2025

$20,473 (+1.6%)

$146,038 + $67,831

$213,869

2024

$20,153 (+1.8%)

$146,038 + $67,831

$213,869

2023

$19,801 (+9.5%)

$151,339 + $77,077

$228,416

2022

$18,084 (+4.8%)

$155,025 + $77,077

$232,102

2021

$17,248 (+6.1%)

$112,972 + $80,957

$193,929

2020

$16,263 (+1.6%)

$116,223 + $83,287

$199,510

2019

$16,014 (+9.7%)

$107,608 + $79,229

$186,837

2018

$14,595 (+3.2%)

$107,608 + $79,229

$186,837

2017

$14,138 (+7.0%)

$97,416 + $70,921

$168,337

2016

$13,216 (+5.6%)

$97,416 + $70,921

$168,337

2015

$12,514 (+37.8%)

$85,411 + $67,262

$152,673

2014

$9,080 (+2.2%)

$38,049 + $67,572

$105,621

2013

$8,881 (−6.6%)

$38,049 + $67,572

$105,621

2012

$9,509 (+0.9%)

$38,049 + $67,572

$105,621

2011

$9,425 (+15.0%)

$41,392 + $72,115

$113,507

2010

$8,194 (+7.1%)

$41,392 + $72,115

$113,507

2009

$7,651

$53,730 + $47,650

$101,380

Tax history for 430 Mapleton Ave

Year

Property tax

Land + Additions

Assessment*

2025

$20,473 (+1.6%)

$146,038 + $67,831

$213,869

2024

$20,153 (+1.8%)

$146,038 + $67,831

$213,869

2023

$19,801 (+9.5%)

$151,339 + $77,077

$228,416

2022

$18,084 (+4.8%)

$155,025 + $77,077

$232,102

2021

$17,248 (+6.1%)

$112,972 + $80,957

$193,929

2020

$16,263 (+1.6%)

$116,223 + $83,287

$199,510

2019

$16,014 (+9.7%)

$107,608 + $79,229

$186,837

2018

$14,595 (+3.2%)

$107,608 + $79,229

$186,837

2017

$14,138 (+7.0%)

$97,416 + $70,921

$168,337

2016

$13,216 (+5.6%)

$97,416 + $70,921

$168,337

2015

$12,514 (+37.8%)

$85,411 + $67,262

$152,673

2014

$9,080 (+2.2%)

$38,049 + $67,572

$105,621

2013

$8,881 (−6.6%)

$38,049 + $67,572

$105,621

2012

$9,509 (+0.9%)

$38,049 + $67,572

$105,621

2011

$9,425 (+15.0%)

$41,392 + $72,115

$113,507

2010

$8,194 (+7.1%)

$41,392 + $72,115

$113,507

2009

$7,651

$53,730 + $47,650

$101,380

*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

0.32 Acres

Year renovated

1980

Sq. Ft.

2,967

Year built

1892

Style

Single Family Residential

County

Boulder County

APN

R0008125

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Sep 2, 2026.

Property details

Parking

Parking Features
Covered Spaces: 0
Garage Spaces: 0

Interior

Bathroom Information
Bathrooms (Full): 1
Bathrooms (Half): 2
Bathrooms (Three Quarter): 0

Bedroom Information
Bedrooms Total: 5

Heating & Cooling
Heating: Yes
Forced Air

Interior Features
Electric Range/Oven, Refrigerator
Fireplace: Yes
Fireplace Features: Living Room
Flooring: Wood Floors
Separate Dining Room, Open Floorplan, Walk-In Closet(s)

Room Information
Basement: Partial, Unfinished

Exterior

Exterior Features
Fencing: Partial, Fenced
Patio and Porch Features: Patio, Enclosed
Roof: Composition

Lot Information
Horse(s): No
Lot Features: Wooded, Level
Other Structures: Storage
Zoning: LRE

Property Information
Property Type: Residential
Waterfront: No

Subdivision Information
Subdivision Name: Mapleton
MLS Area Major: Boulder

Building Information
Above Grade Finished Area: 2967
Below Grade Finished Area: 378
Building Area Total: 2967
Construction Materials: Brick/Brick Veneer

Financial

Tax Information
Parcel Number: R0008125
Tax Annual Amount: 6145
Tax Year: 2006

Financial Information
Listing Terms: Cash, Conventional

Utilities

Utility Information
Utilities: Natural Gas Available
Gas: Natural Gas,Excel
Sewer: City Sewer

Location

HOA Information
Association: No
Association Fee: 0

School Information
High School District: Boulder Valley Dist RE2
Elementary School: Whittier
Middle or Junior School: Casey
High School: Boulder

Location Information
Directions: From Broadway and Mapleton, west on Mapleton to home
Unparsed Address: 430 Mapleton Ave Boulder CO 80302
Street Number: 430
Street Name: Mapleton
Street Suffix: Ave
City: Boulder
State or Province: CO
County or Parish: Boulder
Country: US
Postal Code: 80302
Coordinates: -105.29098,40.020445
Latitude: 40.020445
Longitude: -105.29098

Public facts

Beds: 4
Baths: 3.0
Sq. Ft.: 2,967
Stories: —
Lot Size: 0.32 acres
Style: Single Family Residential
Year Built: 1892
Year Renovated: 1980
County: Boulder County
APN: R0008125

Home facts updated by county records on Sep 2, 2026

Other

Listing Information
Attribution Contact: 3034406464
Close Price: $1,600,000
Photos Count: 6
Possible Use: Single Family
Special Listing Conditions: Private Owner
Standard Status: Closed

Listing Date Information
Close Date: Friday, February 8, 2008
Cumulative Days on Market: 538
Days on Market: 264
Listing Contract Date: Monday, May 21, 2007
Modification Timestamp: Wednesday, July 24, 2024 9:24 PM

Home Information
Levels: Three Or More
Year Built: 1892

Around this home

Schools

Whittier Elementary School

Public K-5 • Assigned • 1.1mi

6/10

Casey Middle School

Public 6-8 • Assigned • 0.6mi

5/10

Boulder High School

Public 9-12 • Assigned • 0.9mi

9/10

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 90° expected this year, 19 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

2/10 Air Factor

2 unhealthy days expected this year, 2 days in 30 years

Provided by First Street

Historical weather

Boulder, CO • 80302

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 10.5 hours in June and 6 hours in December, placing it above the U.S. average for solar exposure.

10.5 hrs

6 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$2.89M – $3.50M

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Home values near 430 Mapleton Ave

Data from public records.

Address	Redfin Estimate
403 Mapleton Avenue, Boulder, CO 3 Beds \| 2 Baths \| 3254 Sq. Ft.	$1,973,236
456 Mapleton Avenue, Boulder, CO 5 Beds \| 3.5 Baths \| 3683 Sq. Ft.	$2,381,977

Address	Redfin Estimate
502 Mapleton Avenue, Boulder, CO 5 Beds \| 4 Baths \| 4508 Sq. Ft.	$3,269,552
409 Mapleton Avenue, Boulder, CO 4 Beds \| 2 Baths \| 2414 Sq. Ft.	$1,642,796

Address	Redfin Estimate
501 Mapleton Avenue, Boulder, CO 5 Beds \| 5 Baths \| 4832 Sq. Ft.	$3,042,204
424 Mapleton Avenue, Boulder, CO 3 Beds \| 3.5 Baths \| 2966 Sq. Ft.	$2,847,438

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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 80302, CO

Sale history for 430 Mapleton Ave

Tax history for 430 Mapleton Ave

Public record

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 80304

Home values near 430 Mapleton Ave

More real estate resources