$8,500,000

440 Japonica Way, Boulder CO, 80304

Price per sqft$1,620.90

Built in2023

Property size5,244 sqft

Property typeResidential

Overview

Sold

Closed

Listed Feb 19, 2026

Updated Jul 7

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.

Additional information

MLS^® ID: IR1051957

Interior Features

Bedrooms: 5
Bathrooms: 5
Fireplace: Yes
Cooling: Yes
Heating: Yes
Basement: Yes

Exterior Features

Lot Size: 0.29 Acres

Other Property Details

Taxes: $29,325
Tax Frequency: Annually
Garage: Yes
View: Yes
Pool: Yes

Also listed on IRES

Listed by milehimodern - Boulder, R Tim Goodacre, Listing Contact:

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