Welcome to Builders' General Supply Co.

Builders' General Supply Co. is proud to be your local, independent Marvin and Integrity Windows and Doors Retailer. Our experts will provide you with helpful advice and personalized service to create rooms that reflect your style and complement your décor. Marvin and Integrity windows and doors offer unparalleled innovation, superior quality and performance and unmatched design flexibility to ensure the best solution for your project. Discover the difference with Builders' General Supply Co. today.


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Get the information you need about energy efficient windows and doors

Marvin Windows and Doors are an industry leader in energy efficiency, offering a variety of flexible and customizable window and door options to meet your needs. Download this Energy Efficiency FAQ sheet before you purchase your windows or doors.

This Old House Sponsor
Proud Sponsor of Award-Winning PBS Television Show “This Old House”

Through our partnership, more than 50 handcrafted Marvin windows will be installed during this season’s ambitious update of the Arlington House, an early English-style Arts and Crafts home built in 1909 in Arlington, Mass. As the project unfolds, the beloved “This Old House” cast – Kevin O’Connor, Norm Abram, Roger Cook, Richard Trethewey and Tom Silva – walks viewers through an extensive renovation and remodel using carefully selected materials and products, like the Marvin Next Generation Ultimate Double Hung window, honoring the history of the home while incorporating modern design touches and amenities.

Check your local listings for showtimes to watch the project come to life.

Ultrex - Quite Possibly the Perfect Building Material
Quite Possibly the Perfect Building Material

Ultrex® pultruded fiberglass is the unsurpassed leader for lasting performance, strength and beauty. It is specifically designed to withstand the rigors of time and our harshest climates, while providing long-lasting aesthetics with clean lines and bold colors. Eight times stronger than vinyl, Ultrex products feature a superior finish that resists fading, dings and scratches.

Ultrex is available exclusively through the Marvin Family of Products. So you can rest assured that whether you are replacing your windows and doors, or building new construction, your home will look beautiful now and in the future.

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The advantages of working with a Marvin Dealer

Whether you're building a new home, remodeling or making home improvements, we understand that choosing windows and doors can be a big decision. Our Marvin experts will walk you through the options - including energy-efficient glazing, hardware finishes, clad colors and other design features. We'll be there to answer your questions and help you make the right choices for your project.

Integrity Windows and Doors 20 Years Promo
20+ Years of Residential Remodeling and Replacement Experience

Every remodeling project has its own unique requirements and Integrity is equipped to meet those challenges. Two distinctive series, All Ultrex® and Wood-Ultrex®, provide an abundance of sizing, performance, and configuration capabilities to meet your needs. The Ultrex material pioneered by Marvin Windows and Doors, combines proprietary pultruded fiberglass and finish technologies that deliver proven energy efficiency and sustainable performance advantages. Our experts can guide you through even the toughest projects.

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Tradition that never goes out of style

The double hung window has been a prominent feature in American architecture for centuries. At Marvin® Windows and Doors, it is part of our heritage of providing industry-leading products, and quality windows and doors for the American home. We are proud to make an American classic, handcrafted in America. With advancements in engineering the Marvin Ultimate Double Hung window now integrates a classic look with state-of-the-art durability, versatility and ease of use. Smooth operation, tilt-in convenience and extensive size, shape, and finish options make this the perfect window for remodeling, replacement, historic renovation or new construction projects.

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Wide Open Possibilities

There's a magnificent vista on the horizon. You want to knock down a wall to turn an ordinary room into an extraordinary one and redefine your family room to include indoor and outdoor living spaces. And after all that, you don't want anything to stand between you and your view. That's why Marvin designed a line of Scenic Doors. The Ultimate Lift and Slide and Bi-Fold doors are available in stunningly large sizes and numerous panel configurations, they allow for a seamless transition from the exterior to the interior of your home. Marvin's industry-exclusive hardware virtually disappears, giving you an incredibly clean and unobstructed view with simple, effortless operation.