C650 Ultra™ Series

Exceptionally strong and low-maintenance, the C650 Ultra™ Series windows are made from fiberglass, one of the most durable materials on the window-and-door market. They’re ideal for any style and climate.

Fiberglass Windows

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About Collection Windows Types Glass Packages Colors Inspiration Photos

About collection

About the collection

The C650 Ultra™ Series fiberglass windows and patio doors are built to last. The frame is resistant to swelling, rotting, and warping, making it the perfect choice for long-lasting beauty and performance. Its slim profile offers the maximum available viewable glass area to highlight your view. With five exterior frame colors and the ability to paint the exterior, the Ultra Series offers a flexible and beautiful solution.

Durable Fiberglass

Resists swelling, rotting,and warping for long-lasting performance.

Maximum View

A slim profile provides more visible glass area and a modern look.

Design Flexibility

Available in five exteriorframe colors withpaintable exteriors.

Lifetime Warranty

Backed by the Milgard Full Lifetime Warranty forpeace of mind.

Window Types

Milgard C650 Radius

C650 Ultra Series radius windows come in operable or inoperable styles. What sets them apart is the curved feature, which can be a simple arched top or even a circular window shape. A beautiful and elegant option, radius windows can also have grids added. The aluminum and wood frame of the C650 Ultra Series radius windows is designed to blend seamlessly with the operating styles made with fiberglass.

Milgard C650 Bay & Bow

C650 Ultra Series bay and bow windows bring architectural beauty to any home. Bay windows are three-segment units that expand your space to the outdoors. Bow windows are four or more equal-width panels that create a dramatic, curved space in your home. Add operating styles for airflow in addition to daylight.

Milgard C650 Picture

C650 Ultra Series picture windows are the best way to frame a beautiful view. These inoperable fiberglass windows let in natural light and can be used in combination with operable fiberglass windows if airflow is desired in a particular room.

Milgard C650 Awning

C650 Ultra Series fiberglass awning windows open outward from the bottom allowing for excellent airflow. Awning windows come with a folding nesting operating handle.

Milgard C650 Casement

C650 Ultra Series casement windows allow for maximum ventilation in your home coupled with an unobstructed view. They hinge on the side and open just like a door. This fiberglass window style comes with a folding nesting handle set.

Milgard C650 Single Hung

C650 Ultra Series single-hung windows offer superior venting and daylight. The bottom sash is operable and opens by moving upward. Pulling downward closes and locks the window. Ultra Series fiberglass single hung windows have two choices for hardware: a Positive Action Lock™ or cam lock.

Milgard C650 Horizontal Sliding

With C650 Ultra Series horizontal sliding, choose from a left or right-side operable sash to allow airflow into any room. Ideal for windows facing a balcony or patio because they do not protrude toward the exterior of the home. Great for replacement window and new construction jobs.

Glass Packages