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Integrity Replacement Windows And Doors Premier Dealer

Room scene featuring Integrity Windows from an Integrity windows dealer

Your premier Integrity Windows Dealer in Central and Eastern PA

GR Mitchell is the Marvin Integrity Premier Replacement Windows dealer near you. We are a Marvin Authorized Integrity Dealer who can sell all three of the Marvin Brands: Integrity Windows and Doors, Marvin Windows and Doors, and Infinity Replacement Windows. If you would like to learn how Integrity Windows can work for your window project, give us a call or stop by our windows showroom.

Integrity Replacement Windows LogoIntegrity Authorized Retailer
GR Mitchell
14 Beaver Valley Pike
Willow Street, PA 17584


Winter Store Hours:
Mon – Fri: 7am – 7pm

Saturday: 7am – 5pm
Sunday: 10am – 3pm

Marvin Integrity® Windows are Built to Perform for New Construction 

Integrity New Construction Windows in a new residential home.

Integrity Windows was named the Best Quality Fiberglass Window Brand by Builder Magazine who surveyed over 10,000 builders, contractors, and developers.

In 1994, the Marvin® Companies created Integrity Windows. The family-owned and operated company was founded on the same core values of service, craftsmanship, and quality with a focus on performance. Integrity manufactures the most innovative fiberglass doors and windows on the market. As a small town company, Integrity delivers superior customer support and works to improve the communities we do business with.

As former President Susan Marvin says, “At Integrity, we didn’t just join the fiberglass window and door industry — we pioneered it.”

Insert Replacement Windows and Doors Featuring Ultrex® Pultruded Fiberglass

Marvin Integrity windows in a home

Easy to Install Integrity Replacement Windows
Integrity Wood-Ultrex and all Ultrex insert replacement windows have a 3 1⁄4″ frame depth for quick installations that won’t disturb existing trim. There is also an optional frame expander kit that provides a precise fit, and comes with a color matched solution for the right finish. The Ultrex exteriors are paired with either rich wood or Ultrex fiberglass interiors for a durable, long-lasting solution. Integrity Windows and Doors are delivered to GR Mitchell in just 10 days, which can help keep your window replacement project on schedule. GR Mitchell can also install your windows for larger, builder projects with our turnkey services.

Integrity Replacement Doors
Integrity Replacement Doors are surprisingly different from other replacement doors. Like the replacement windows, Integrity doors can be custom sized and have an array of options like insulated glass, divided light patterns, multiple colors and finishes, and exterior trim and hardware options. Made from wood or Ultrex fiberglass, Integrity doors are extremely durable and resistant to wear.

Replacement Door Configurations
Sliding doors are available in 2, 3, and 4 panel configurations.
Outswing and Inswing French Doors are available in 1, 2, and 3 panel configurations.

Integrity Replacement Door Types

Ultrex®, State-Of-The-Art Pultruded Fiberglass

Ultrex is a highly durable, pultruded fiberglass material with a patented finish that outperforms and outlasts roll-form aluminum, vinyl, and even vinyl/wood composites. The result is replacement windows and doors made from a material that is 8 times stronger than vinyl, and can last up to 38% longer.

The four advantages of fiberglass

AAMA Verified Fiberglass Finish
Ultrex is the first fiberglass finish to be verified to any of AAMA’s 624-10 voluntary finish specifications for fiber reinforced thermoset profiles (fiberglass). The Ultrex patented acrylic cap finish is verified AAMA 623-10 and 624-10, and has passed the AAMA 625-10 lab-based performance test protocols; 625-10 outdoor weathering test protocols are in process. With the industry’s best fiberglass finish, Ultrex resists fading, chalking, scratching, and cracking to keep your project looking good for years to come.

Learn More about Integrity Replacement Windows and Doors

To learn more about Integrity Replacement Windows and Doors you can download the brochure  Integrity_All_Ultrex Wood Ultrex_Replacement_Solutions or visit the Integrity Windows and Doors website. You can also visit or stop by our showroom or call us at 717-464-2999.