Integrity Windows & Doors

Stylish Durability

Integrity by Marvin is another example of the Goldfinch Bros., Inc. commitment to providing the best quality products. Their industry leading high performance coating system provides a no-worry exterior finish. Your choice of wood or fiberglass interiors allows additional personalization. This product has options for all construction types including new construction, retrofit and replacements.

Unmatched Quality

Integrity windows and doors are made with Ultrex pultruded fiberglass, a material patented nearly 20 years ago when Integrity pioneered the fiberglass windows and door category. Integrity has led the category ever since with a commitment to a product that is tough, smart, long lasting, and worry-free.

Integrity offers two series to meet all your building needs. First is the Wood-Ultrex Series that offers the strength of the Ultrex exterior and the appeal of a wood interior. Durable inside and out, the All-Ultrex series is made with Ultrex fiberglass interior and exterior for maximum durability and quality. Both products are truly “Built to Perform.”

Bring Tough Back

Try as you might, you can’t keep these windows down. Watch as the toughness of Integrity windows made with Ultrex pultruded fiberglass is tested against the West Fargo hockey team.


Efficiency and environmental sustainability are a proud part of our culture at both Integrity and Marvin. Through waste reduction, the wise use of resources, and long lasting, energy-efficient products, we will be agents of change for the future. Marvin has a long history of green-minded initiatives with recycling efforts, employee awareness and incorporating green components into our processes.

Contemporary Design

The strength of the Ultrex material lends itself to contemporary designs and narrow sight-lines. Integrity® is built to perform and in contemporary design, that means we build expansive products for maximum light, clean lines with narrow profiles, offer flexibility for unique solutions and a history of performance that is unmatched.