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U Residential

440 Japonica Way

Boulder, CO 80304

RECOLORADO #IR1051957 Updated: Jun 9, 2026, 12:15am
$8,700,000
5 Beds • 5 Baths • 5,244 SqFt
Property
UResidential
1/32
$8,700,000

440 Japonica Way

Boulder, CO 80304
5
Beds
5
Baths
5,244
SqFt
0.29
Acres
RECOLORADO
#IR1051957
Updated: Jun 9, 2026, 12:15am

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.
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Included Appliances
DishwasherDouble OvenRefrigerator

Property Details

Interior
Above Grade Finished Area
3512
Appliances
DishwasherDouble OvenRefrigerator
Below Grade Finished Area
1431
Below Grade Unfinished Area
301
Building Area Total
5244
Cooling
Central Air
Fireplace Features
Living Room
Flooring
Wood
H V A C Description
Central Air
Heating
Heat PumpHot Water
Interior Features
Eat-in KitchenFive Piece BathKitchen IslandOpen FloorplanPantryVaulted Ceiling(s)Walk-In Closet(s)
Laundry Features
In Unit
Living Area
4943
Room Count
14
Window Features
Double Pane WindowsWindow Coverings
Construction
Building Area Source
Assessor
Construction Materials
BrickFrame
Levels
Two
Roof
CompositionMembrane
Structure Type
House
Year Built
2023
Site & Exterior
Garage Spaces
2
Lot Features
Cul-De-SacLevelSprinklers In Front
Lot Size Acres
0.29
Lot Size Square Feet
12784
Parking Features
Oversized
Parking Total
2
Patio And Porch Features
Patio
Pool Features
Private
Power Production Count
Yes
Road Frontage Type
Public
Road Surface Type
Paved
Sewer
Public Sewer
Utilities
Cable AvailableElectricity AvailableNatural Gas Available
View
Mountain(s)
Water Source
Public
Zoning
RES
Financials
Contract Earnest Check To
Elite Title CompanyLLC
Contract Min Earnest
400000.00
Exclusions
Seller's personal property and/or staging items. Flat files in office.
Ownership
Individual
Parcel Number
R0001873
Purchase Contract Date
2026-06-06
Tax Annual Amount
29325
Tax Legal Description
LOT 5 & SM TRIANGLE IN SE OF LOT 6 TEETS
Tax Year
2025

Neighborhood & Lifestyle

Community & Association
Subdivision Name
Northwest Boulder
Schools
Ratings
Elementary
Foothill
Middle
Centennial
High
Boulder
Elem. District
Boulder Valley RE 2
High District
Boulder Valley RE 2
Listing provided courtesy of RECOLORADO via IDX. Updated: Jun 9, 2026, 12:15am.
R Tim Goodacre

Listing Agent

milehimodern - Boulder

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