403 W William Street, Superior, CO

$2,400,000

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7

Beds

7

Baths

5,185

Square feet

0.16

Acres

About 403 W William Street

Welcome to this stunning custom home offering walkable convenience and refined living, complete with a finished basement and fully independent ADU. Move-in ready with designer blinds and mature landscaping. Step out the back door to Whole Foods, Super Target, the McCaslin RTD station, and the newly rebuilt Founder's Park. From the front, enjoy Downtown Superior and miles of open space trails. Located on a corner lot, the home features an open floor plan, seamless indoor-outdoor living, and mountain views. Generous rooms, sweeping windows, and 10-foot ceilings throughout fill the home with natural light. The main level includes rich wood flooring, a great room with fireplace, and a chef's kitchen that includes a large island and striking countertops. Between the home and garage, a secluded landscaped courtyard patio with privacy fencing creates a blissful outdoor retreat. A custom floating staircase leads to two spacious upstairs bedrooms that are in addition to the primary suite---each with its own bath, plus a laundry room and sitting area opening to a covered balcony. The primary suite offers a five-piece bath with soaking tub, Porcelanosa-tiled walk-in shower, and expansive walk-in closet. A main-level ensuite bedroom provides flexible living and use options. The finished basement adds a rec room, wet bar, gym space, and two bedrooms.The detached two-car garage includes a finished ADU with bedroom, bath, full kitchen, washer/dryer, and balcony---ideal for guests, office, or rental use. Extras include fire sprinkler suppression system, indoor and outdoor EV charging, and hot tub. Turnkey home with quick access to Highway 36, Boulder, Denver, and DIA!

Features of 403 W William Street

MLS® # IR1053262
Price $2,400,000
Bedrooms 7
Bathrooms 7.00
Full Baths 5
Half Baths 1
Square Footage 5,185
Acres 0.16
Year Built 2023
Type Residential
Sub-Type Single Family Residence
Status Coming Soon

Community Information

Address 403 W William Street
Subdivision Superior West
City Superior
County Boulder
State CO
Zip Code 80027

Amenities

Utilities Electricity Available, Natural Gas Available
Parking Spaces 2
# of Garages 2
View Mountain(s), Plains
Is Waterfront No
Has Pool No

Interior

Interior Features Eat-in Kitchen, In-Law Floorplan, Open Floorplan, Pantry, Smart Thermostat, Walk-In Closet(s), Wet Bar
Appliances Bar Fridge, Dishwasher, Dryer, Microwave, Oven, Refrigerator, Washer
Heating Forced Air, Heat Pump
Cooling Air Conditioning-Room, Central Air
Fireplace Yes
Fireplaces Gas, Living Room
Stories Two

Exterior

Exterior Features Balcony, Spa/Hot Tub
Lot Description Corner Lot, Level, Sprinklers In Front
Windows Double Pane Windows, Window Coverings
Roof Composition

School Information

District Boulder Valley RE 2
Elementary Monarch K-8
Middle Monarch K-8
High Monarch

Additional Information

Date Listed March 15th, 2026
Zoning RL
Foreclosure No
Short Sale No
RE / Bank Owned No

Listing Details

OfficeBuyers' Slice Realty
Contact Info3033766111

Listing Map

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