440 Japonica Way Boulder, CO ^$ 9,950,000

440 Japonica Way

^$ 9,950,000

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440 Japonica Way

Boulder, CO, 80304

^$ 9,950,000

Bedrooms4 Baths4.1 Sq 5,244

Monthly Estimate*

^$ 62,075

Listed by milehimodern - Boulder

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Single Family Home for sale in Boulder, CO

for $9,950,000 with 4 bedrooms and 4 full baths, 1 half bath. This 5,244 square foot home was built in 2023 on a lot size of 0.29.

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.

Single Family Active

Price

^$ 9,950,000

Bedrooms

Full Bath

Half Bath

Property Type

Single Family

Taxes

^$ 29,529

Style

House

Lot Size

0.29

Year Built

2023

Town/City

Boulder

County/Region

Boulder

MLS | Web ID

IR1031937

Features

Interior

Interior Amenities Eat-in Kitchen Five Piece Bath Kitchen Island Open Floorplan Pantry Vaulted Ceiling(s) Walk-In Closet(s)

Flooring Wood

Fireplace Features Living Room

Basement (Y/N) Y

Window Features Double Pane Windows Window Coverings

Above Grade Finished Area 3512

Half Baths 1

3/4 Baths 3

Laundry Features In Unit

Total Bedrooms 4

Below Grade Finished Area 1431

Main Level Bedrooms 1

Main Level Bathrooms 2

Total Baths 5

General

Sewer Public Sewer

Heating Heat Pump Hot Water

Cooling Central Air

Utilities Cable Available Electricity Available Natural Gas Available

Possession Closing/DOD

Roof Composition Membrane

Appliances Dishwasher Double Oven Refrigerator

Zoning RES

Garage Spaces 2

Patio/Porch Features Patio

Pool Features Private

Construction Materials Brick Frame

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

Year Built 2023

View Mountain(s)

Levels Two

Property Subtype Single Family Residence

Tax Year 2024

Ownership Individual

County Boulder

Property Type Residential

HOA N

Attached Garage Y

Subdivision Name Northwest Boulder

Full Baths 1

Status Active

High School Boulder

City Boulder

High School District Boulder Valley RE 2

Lot Size Square Feet 12784

Listing Terms Cash Conventional

Elementary School Foothill

Tax Annual Amount 29529

Middle/Junior High School Centennial

Concessions No

Virtual Tour https://vimeo.com/1082151454

Structure Type House

Standard Status Active

Occupancy Type Owner

Elementary School District Boulder Valley RE 2

Exterior

Parking Features Oversized

Lot Features Cul-De-Sac Level Sprinklers In Front

Water Source Public

Total Parking 2

Building Area Total 5244

Lot Size Acres 0.29

Road Surface Type Paved

Road Frontage Type Public

Internal Only

Street Number 1 440

* Excluded Features

List By

Milehimodern - Boulder

Broker

(303) 817-9300

Phone

Affordability Calculator

$64,536

Per Month

Monthly Principal & Interest: $62,075
Monthly Property Taxes: $2,461
Monthly Home Insurance: --

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Down Payment

Loan Term

Interest Rate

Yearly Property Taxes

Yearly Home Insurance

Default based on a 30-year fixed rate of 6.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

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Nearby

Trends
Schools

Single family listings in Boulder, CO

Average List Price ^$2,493,570

Percent of Sale Price 75%

About Boulder, CO

102,151 Population

6% Since 2002

^$65,436 Median Income

31.88 Median Age

18% Households with Children

View more area information

Trends Information provided by ATTOM Data Solutions.

1955676 Elementary School

1955871 Middle School

Boulder High School High School

See complete school information

Pricing History

Date	Price	Price Change	Description
8/28/2025	$9,950,000	-9.55%	Price Down
7/3/2025	$11,000,000	-8.33%	Price Down
4/23/2025	$12,000,000		Listed Price

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440 Japonica Way, Boulder, CO, 80304 is a Single Family Home for sale at $9,950,000 with 5,244 sqft and a lot size of 0.29. 440 Japonica Way has 4 bedrooms, 4.1 baths, and was built in 2023. The property's zip code is 80304 which is in Boulder, CO

*Information deemed reliable but not guaranteed.

Financial calculator disclaimer: Default based on a 30-year fixed rate of 6.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

The data relating to real estate on this web site comes in part from the Internet Data eXchange (IDX) Program of the REcolorado. Real estate listings held by firms other than Weichert Realtors are marked with the IDX logo and detailed information about them includes the Listing Broker’s Firm Name.

The information being provided is for consumers personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

Data is updated as of 12/6/2025.

This publication is designed to provide information with regard to the subject matter covered. It is displayed with the understanding that the publisher and authors are not engaged in rendering real estate, legal, accounting, tax, or other professional services and that the publisher and authors are not offering such advice in this publication. If real estate, legal, or other expert assistance is required, the services of a competent, professional person should be sought.

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PUBLISHER’S NOTICE: All real estate advertised herein is subject to the Federal Fair Housing Act and the Colorado Fair Housing Act, which Acts make it illegal to make or publish any advertisement that indicates any preference, limitation, or discrimination based on race, color, religion, sex, handicap, familial status, or national origin.

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440 Japonica Way

Single Family Home for sale in Boulder, CO

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