440 Japonica Way, Boulder, CO 80304

$8,500,000
5
BD
5
BA
4,943
SqFt

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Sold Price
$8,500,000
List Price
$8,700,000
Status
CLOSED
MLS#
1051957
Closing Date
Jul 02, 2026
Year Built
2023
Bedrooms
5
Bathrooms
5
Living Area
4,943
Region
Boulder
Subdivision
Northwest Boulder

Property Description

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

Taxes
$29,325
School District
Boulder Valley Dist RE2
Elementary School
Foothill
Middle School
Centennial
High School
Boulder
Heating
Hot Water, Heat Pump, Zoned
Cooling
Central Air
Utilities
Natural Gas Available, Electricity Available, Cable Available
Garage Spaces
2
Zoning
RES

Listing courtesy of R Tim Goodacre.

3038179300

Selling Office: .

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