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440 Japonica Way, Boulder, CO 80304

Local realty services provided by:CENTURY 21 Cornerstone
440 Japonica Way,Boulder, CO 80304
$9,950,000
  • 4 Beds
  • 5 Baths
  • 5,244 sq. ft.
  • Single family
  • Active
Listed by: r tim goodacre
Office: milehimodern - boulder
MLS#:1031937
Source:IRES

Price summary

  • Price:$9,950,000
  • Price per sq. ft.:$1,897.41

About this home

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

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Home facts

  • Year built:2023
  • Listing ID #:1031937
  • Added:266 day(s) ago
  • Updated:January 14, 2026 at 09:28 PM

Rooms and interior

  • Bedrooms:4
  • Total bathrooms:5
  • Full bathrooms:1
  • Half bathrooms:1
  • Living area:5,244 sq. ft.

Heating and cooling

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

Structure and exterior

  • Roof:Composition, Rubber
  • Year built:2023
  • Building area:5,244 sq. ft.
  • Lot area:0.29 Acres

Schools

  • High school:Boulder
  • Middle school:Centennial
  • Elementary school:Foothill

Utilities

  • Water:City
  • Sewer:Public Sewer

Finances and disclosures

  • Price:$9,950,000
  • Price per sq. ft.:$1,897.41
  • Tax amount:$29,529
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