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404 W William Street B, Superior, CO – $850,000

  • 3 Beds
  • 4 Baths
  • 2,502 Sqft
  • .16 Acres
  • 3 Beds
  • 4 Baths
  • 2,502 Sqft
  • .16 Acres

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404 W William Street B

Bright, stylish, and practically brand new—this Superior gem has it all. Built in 2023 and surrounded by million-dollar properties, this HERS-certified, energy-efficient home perfectly combines modern design and comfort—and best of all, there’s no HOA. Hardwood floors flow throughout the main level, complemented by stylish lighting and custom top-down, bottom-up blinds for ideal light and privacy control. The kitchen impresses with quartz countertops, t ile backsplash, stainless steel appliances including a gas range, abundant cabinet and prep space plus a huge walk-in pantry. Upstairs are three spacious bedrooms, including a vaulted ceiling primary suite with dual sinks, a walk-in closet, linen closet, and custom tiled shower. The upstairs laundry includes washer and dryer for easy move-in. The finished basement, with high ceilings and an egress window, offers flexible space for a media room, home gym, or easy conversion into a fourth bedroom, complete with a stylish three-quarter bath. Outdoor living is exceptional, with two separate fenced areas perfect for pets, gardening, or outdoor dining. The 2 car garage is finished and insulated. A Level 3 fire mitigation system provides added peace of mind. Enjoy views of the Boulder Flatirons and an unbeatable location—just steps from Founders Park and the beautiful 14-mile Coal Creek soft-surface trail, offering scenic hiking, biking, and wildlife viewing that connects Superior and Louisville. Enjoy convenient access to Hwy 36, nearby amenities like Costco, Whole Foods, and the RTD Park-n-Ride. Located within the highly sought-after Boulder Valley RE-2 School District, this home offers the perfect blend of modern design, energy efficiency, and the best of Colorado living.

Listing Office: Berkshire Hathaway HomeServices RE of the Rockies

Essential Information

  • MLS® #7540494
  • Price$850,000
  • Bedrooms3
  • Bathrooms4.00
  • Half Baths1
  • Square Footage2,502
  • Acres0.16
  • Year Built2023
  • TypeResidential
  • Sub-TypeSingle Family Residence
  • StyleContemporary
  • StatusActive

Community Information

  • Address404 W William Street B
  • SubdivisionOld Superior
  • CitySuperior
  • CountyBoulder
  • StateCO
  • Zip Code80027

Amenities

  • Parking Spaces2
  • # of Garages2
  • ViewMeadow

Utilities

Cable Available, Electricity Connected, Internet Access (Wired), Natural Gas Connected, Phone Available

Parking

Concrete, Dry Walled, Exterior Access Door, Finished Garage, Insulated Garage, Lift, Lighted

Interior

  • HeatingForced Air
  • CoolingAir Conditioning-Room
  • StoriesTwo

Interior Features

Breakfast Bar, Ceiling Fan(s), Eat-in Kitchen, Entrance Foyer, High Ceilings, High Speed Internet, Kitchen Island, Open Floorplan, Pantry, Primary Suite, Quartz Counters, Radon Mitigation System, Smoke Free, Vaulted Ceiling(s)

Appliances

Dishwasher, Disposal, Dryer, Freezer, Gas Water Heater, Microwave, Oven, Range, Refrigerator, Washer

Exterior

  • Exterior FeaturesLighting, Private Yard
  • RoofComposition
  • FoundationSlab

Lot Description

Fire Mitigation, Irrigated, Landscaped, Level, Sprinklers In Front, Sprinklers In Rear

Windows

Double Pane Windows, Window Coverings

School Information

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

Additional Information

  • Date ListedOctober 16th, 2025
  • ZoningXSU

Listing Details

Berkshire Hathaway HomeServices RE of the Rockies

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Listing information last updated on October 18th, 2025 at 5:18pm MDT.