Fiberglass Windows

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Ultra™ Series | C650

Ultra™ Series is our contemporary premium fiberglass window and patio door line that is strong and built to last. The fiberglass material resists swelling, rotting, and warping making it the perfect choice for long-lasting durability coupled with exceptional beauty. Awarded Most Used window brand in the Western United States*, Ultra™ Series offers high performing and energy efficient windows and patio doors for an upscale look that can complement any home.
*2020 BUILDER Magazine Brand Use Study


  •  Fiberglass frames are resistant to temperature fluctuations making them a durable, low maintenance choice
  • Window hardware is attractive, secure and easy to operate
  • Four exterior frame colors to enhance the look of your home
  • Use Black Bean or Bark to create the popular dark window look with matching interior and exterior frames
  • The Milgard Lifetime Limited Warranty