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$9,500,000 New to Website

  • For Sale
  • Active
  • Single Family
  • 4 Beds
  • 1 Full Bath
  • 4 Partial Baths
  • 5,244 Sq. Ft.
  • 2 Car Garage
  • Updated 10 hours ago
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A striking blend of sustainability and sophistication; this home, designed by Annette and Dennis Martin in 2023, is tucked on a quiet cul-de-sac off one of Boulder's most coveted streets. This net-zero residence features advanced energy systems, including geothermal heating/cooling, radiant in-floor heat, a high-efficiency gas boiler and a 14.44kW solar array. A thoughtful layout connects open-concept living with vaulted ceilings, custom floating staircase, extensive millwork and designer lighting from Italy, Denmark, England, and the U.S. The main-floor primary suite offers a spa-like bath with onyx and white marble tile, double vanities, and a Kohler whirlpool tub. Entertain indoors or out with a chef's kitchen featuring Gaggenau and Sub-Zero appliances, a built-in Sedona grill, and a 10'x38' year-round saltwater pool. Expansive Sierra Pacific windows and doors frame views of the foothills while blending interior and exterior spaces. Savant smart home tech and Lutron lighting ensure effortless living at every turn. Easy upstairs conversion for 3 beds up. Already designed.

Full Property Details for 440 Japonica Way

General

  • Price: $9,500,000
  • Taxes: $29,325 (2025)
  • Status: Active
  • Type: Single Family
  • Source: IRES
  • MLS ID: 1051957
  • Updated: 2/19/2026
  • Added to Site: 1 day(s) ago

Interior

  • Interior Features: Eat-In Kitchen, Cathedral Ceiling(s), Open Floorplan, Pantry, Wood Windows, Walk-In Closet(s), Washer/Dryer Hookup, Kitchen Island, High Ceilings, Beamed Ceilings
  • Fireplace: Yes
  • Fireplace(s): Living Room
  • Appliances: Double Oven, Dishwasher, Refrigerator
  • Flooring: Wood

Rooms

Bathrooms

  • Total Bathrooms: 5
  • Full Bathrooms: 1
  • 3/4 Bathrooms: 3
  • Half Bathrooms: 1
  • Main Floor Baths: 1

Bedrooms

  • Total Bedrooms: 4

Additional Information

  • Pool: Yes
  • Pool Description: Private

Exterior

  • Exterior Features: Sprinkler System, Oversized Garage
  • Porch/Patio/Deck: Patio

Parking

  • Garage: Yes
  • Attached garage: Yes
  • Garage Spaces: 2
  • Parking Features: Attached
  • Garage Description: Attached

Location

  • Area: Boulder
  • County: Boulder
  • Subdivision: Northwest Boulder

School Information

  • School District: Boulder Valley Dist RE2
  • Elementary School: Foothill
  • Middle School: Centennial
  • High School: Boulder

Heating & Cooling

  • Cooling Type: Central Air
  • Heating Type: Hot Water, Heat Pump, Zoned

Utilities

  • Gas: Yes
  • Sewer: Public Sewer
  • Water: City
  • Utility Description: Natural Gas Available, Electricity Available, Cable Available

Structural Information

  • Construction: Frame, Brick
  • Exterior Const.: Frame, Brick
  • Basement: Yes
  • Basement Desc.: Partially Finished
  • Roof: Composition, Rubber
  • Windows: Window Coverings
  • Square Feet: 5,244
  • Sq. Ft. Source: Assessor
  • Living Area: 4,943 Sq. Ft.
  • Year Built: 2023

Lot Features

  • Property View: Hills
  • Lot Size (Acres): 0.29
  • Lot Size (Sq. Ft.): 12,784
  • Frontage: City Street
  • Street/Road Desc.: Asphalt
  • Lot Features: Cul-De-Sac, Level, City Limits, Paved, Curbs, Sidewalks
  • Zoning: RES

Green Features

  • Energy Efficient: Southern Exposure, Windows, Photovoltaic Owned

Financial Considerations

  • Tax Amount: $29,325
  • Tax Year: 2025
  • Terms: Cash, Conventional

Disclosures and Reports

  • Special Conditions: Private Owner
  • Exclusions: Seller's personal property and/or staging items. Flat files in office.
  • Property ID: R0001873

Listed by milehimodern - Boulder (303) 876-1073

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Listing agent

— 440 Japonica Way —

  • milehimodern - Boulder

    303-876-1073

3038179300

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 440 Japonica Way

School District:Boulder Valley School District Re-2
NameGradesDistance
Foothill Elementary School
1001 Hawthorn Avenue, Boulder, CO 80304
K-50.4 mi
Centennial Middle School, Boulder, CO
2205 Norwood Avenue, Boulder, CO 80304
6-81.3 mi
Boulder High School
1604 Arapahoe Avenue, Boulder, CO 80302
9-121.8 mi
Disclaimer: School attendance boundaries provided by Pitney Bowes and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 440 Japonica Way Get Price Alerts and Save Property

Date
Details
Price
Change
Source
2/19/2026
Listed
$9,500,000
413.51%
MLS
4/30/2021
Sold
$1,850,000
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 440 Japonica Way

Year
Property Taxes
Change
Tax Assessment
Change
2025
$29,325
-1%
$307,557
-8%
2024
$29,529
124%
$336,001
115%
2023
$13,158
55%
$156,050
58%
2021
$8,500
-5%
$98,756
3%
2022
$8,914
5%
$95,993
8%
2021
$8,500
5%
$88,746
-5%
2018
$8,115
3%
$93,600
—
2017
$7,861
52%
$93,600
57%
2016
$5,176
-32%
$59,796
-33%
2019
$7,607
55%
$88,746
48%
2015
$4,902
18%
$59,796
24%
2014
$4,150
2%
$48,269
—
2013
$4,058
—
$48,269
—
View All
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

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Listed by milehimodern - Boulder (303) 876-1073

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440 Japonica Way, Boulder, CO 80304 (MLS# 1051957) is a Single Family property with 4 bedrooms, 1 full bathroom and 4 partial bathrooms. 440 Japonica Way is currently listed for $9,500,000 and was received on February 19, 2026. Want to learn more about 440 Japonica Way? Do you have questions about finding other Single Family real estate for sale in Boulder? You can browse all Boulder real estate or contact a Coldwell Banker agent to request more information.

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