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Boulder, CO 80304 440 Japonica Way

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  • MLS# 1051957
  • 02/19/2026
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  • Beds • 5
  • Full/Half Baths • 4 / 1
  • Garage • 2

Home Details

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.
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Interior Features for 440 Japonica Way

Bedrooms

Total Bedrooms5

Bathrooms

3/4 Baths3
Half Baths1
Total Baths5

Other Interior Features

LivingAreaSourceAssessor
Above Grade Finished Area3512
BasementPartially Finished
Below Grade Finished Area1732
Fireplace FeaturesLiving Room
FlooringWood
Interior AmenitiesEat-in Kitchen, Cathedral Ceiling(s), Open Floorplan, Pantry, Wood Windows, Walk-In Closet(s), Washer/Dryer Hookup, Kitchen Island, High Ceilings, Beamed Ceilings
Power Production Type1
Window FeaturesWindow Coverings

General for 440 Japonica Way

AccessibilityLevel Lot, Main Floor Bath, Main Level Bedroom
AppliancesDouble Oven, Dishwasher, Refrigerator
AttributionContact3038179300
CityBoulder
Construction MaterialsFrame, Brick
CoolingCentral Air
CountyBoulder
DisclosuresSeller's Property Disclosure
Elementary SchoolFoothill
Energy EfficientSouthern Exposure, Windows, Photovoltaic Owned
ExclusionsSeller's personal property and/or staging items. Flat files in office.
Expected Active Date 2026-02-19
Full Baths1
Garage Spaces2
HOANo
HeatingHot Water, Heat Pump, Zoned
High SchoolBoulder
High School DistrictBoulder Valley Dist RE2
LevelsTwo
Living Area4943
MLS AreaBoulder
Middle/Junior High SchoolCentennial
New ConstructionNo
Parcel NumberR0001873
Patio/Porch FeaturesPatio
Pool FeaturesPrivate
Property Attached Y/NNo
Property SubtypeSingle Family Residence
Property TypeResidential
RoofComposition, Rubber
SewerPublic Sewer
Standard StatusActive
StatusActive
Subdivision NameNorthwest Boulder
Tax Annual Amount29325
Tax Year2025
UtilitiesNatural Gas Available, Electricity Available, Cable Available
ViewHills
Virtual TourClick here
Year Built2023
ZoningRES

Exterior for 440 Japonica Way

Exterior AmenitiesSprinkler System, Oversized Garage
Irrigation Water Rights Y/NNo
Lot FeaturesCul-De-Sac, Level, City Limits, Paved, Curbs, Sidewalks
Lot Size Acres0.29
Lot Size Area12784
Parking FeaturesAttached
Road Frontage TypeCity Street
Road Surface TypeAsphalt
Water SourceCity
Waterfront Y/NNo

Additional Details

Price History

Schools

High School Boulder High School
Elementary School Foothill Elementary School
Middle School Centennial Middle School

Nathan Washam

Broker/Owner
Price $8,700,000
MLS#1051957
List Date 02/19/2026
Property Type Single Family
Phone 970.988.8295
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