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440 Japonica WayBoulder, CO 80304

For Sale

$9,950,000

Smart Buyer Rebate $99,500

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.

Listed by R Tim Goodacre

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License #IRP09297

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milehimodern - Boulder

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303-817-9300

Last updated August 28, 2025

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Source: REcolorado #IR1031937

Listing Facts

  • TypeSingle-family
  • NeighborhoodJuniper - Kalmia
  • Bedrooms4
  • Bathrooms5
  • Days on Prevu136
  • Taxes$29,529/year
  • Size4,943 sqft
  • Price per sqft$2,013

Amenities

  • Dishwasher
  • Private Outdoor Space
  • Air Conditioning
  • Parking
  • Swimming Pool

Location

Mortgage Calculator

Listing History

08/28/2025
Price Decreased
$9,950,000
07/04/2025
Price Decreased
$11,000,000
04/23/2025
Listed by milehimodern - Boulder
$12,000,000

Property Details for 440 Japonica Way

Exterior

Construction

  • Roof: Composition, Membrane
  • Structure Type: House
  • Window Features: Double Pane Windows, Window Coverings
  • Year Built: 2023
  • Construction Materials: Brick, Frame

Features

  • Patio And Porch Features: Patio
  • Pool Features: Private
  • Road Frontage Type: Public
  • View: Mountain(s)

Measurements

  • Building Area Total: 5,244
  • Lot Features: Cul-De-Sac, Level, Sprinklers In Front
  • Lot Size Acres: 0.29
  • Lot Size Square Feet: 12,784

Financial

Taxes

  • Parcel Number: R0001873
  • Tax Annual Amount: $29,529.00
  • Tax Year: 2024

Interior

Features

  • Appliances: Dishwasher, Double Oven, Refrigerator
  • Fireplace Features: Living Room
  • Flooring: Wood
  • Interior Features: Eat-in Kitchen, Five Piece Bath, Kitchen Island, Open Floorplan, Pantry, Vaulted Ceiling(s), Walk-In Closet(s)

Measurements

  • Living Area: 4,943

Rooms

  • Has Basement: Yes
  • Bathrooms Full: 1
  • Bathrooms Half: 1
  • Bathrooms Three Quarter: 3
  • Bathrooms Total Integer: 5
  • Bedrooms Total: 4
  • Main Level Bathrooms: 2
  • Main Level Bedrooms: 1

Other

General

  • Exclusions: Seller's personal property and/or staging items. Flat files in office.

Location

  • Subdivision Name: Northwest Boulder

Parking

Parking

  • Attached Garage: Yes
  • Garage Spaces: 2
  • Parking Features: Oversized
  • Parking Total: 2

Schools

Elementary School

  • Elementary School: Foothill
  • Elementary School District: Boulder Valley RE 2

High School

  • High School: Boulder
  • High School District: Boulder Valley RE 2

Middle or Junior School

  • Middle Or Junior School: Centennial

Utilities

Equipment

  • Cooling: Central Air
  • Heating: Heat Pump, Hot Water
  • Laundry Features: In Unit
  • Sewer: Public Sewer
  • Utilities: Cable Available, Electricity Available, Natural Gas Available
  • Water Source: Public

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Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.