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403 W William Street, Superior, CO – $2,400,000

  • 7 Beds
  • 7 Baths
  • 5,185 Sqft
  • .16 Acres
  • 7 Beds
  • 7 Baths
  • 5,185 Sqft
  • .16 Acres

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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!

Listing Office: Buyers' Slice Realty

Essential Information

  • MLS® #IR1053262
  • Price$2,400,000
  • Bedrooms7
  • Bathrooms7.00
  • Full Baths5
  • Half Baths1
  • Square Footage5,185
  • Acres0.16
  • Year Built2023
  • TypeResidential
  • Sub-TypeSingle Family Residence
  • StatusComing Soon

Community Information

  • Address403 W William Street
  • SubdivisionSuperior West
  • CitySuperior
  • CountyBoulder
  • StateCO
  • Zip Code80027

Amenities

  • Parking Spaces2
  • # of Garages2
  • ViewMountain(s), Plains

Utilities

Electricity Available, Natural Gas Available

Interior

  • HeatingForced Air, Heat Pump
  • FireplaceYes
  • FireplacesGas, Living Room
  • StoriesTwo

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

Cooling

Air Conditioning-Room, Central Air

Exterior

  • Exterior FeaturesBalcony, Spa/Hot Tub
  • RoofComposition

Lot Description

Corner Lot, Level, Sprinklers In Front

Windows

Double Pane Windows, Window Coverings

School Information

  • DistrictBoulder Valley RE 2
  • ElementaryMonarch K-8
  • MiddleMonarch K-8
  • HighMonarch

Additional Information

  • Date ListedMarch 15th, 2026
  • ZoningRL

Listing Details

  • Buyers' Slice Realty
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Listing information last updated on March 9th, 2026 at 12:19am MDT.