Luxury home exterior at dusk windows and doors by Bonelli

Redefining Boundaries

We are pioneers of industry providing uncommon window and door solutions to one-of-a-kind engineering and design challenges.

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Our Partners

contemporary exterior home featuring Duratherm windows and doors

Wood & Clad Wood

Duratherm defines the window and door category. We are a world-renowned manufacturer of the highest quality custom hardwood windows and doors.

traditional luxury home with Reilly Architectural windows and doors

Metal & Wood

We live for a challenge. Reilly Architectural has virtually no limit to the problems that can be solved with our custom wood and metal window and door systems.

“We've done some extreme things with our windows and doors, and have found people at Duratherm not just willing, but actually excited, to be pushed to their limits.”
Alex Anmahian, Anmahian Winton Architects

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Why the Luxury Division of Pella

Pioneers of Industry

We are the conversation leaders providing unconventional solutions and product innovation to discerning architects in the building industry and beyond.

Exclusive Collaboration

We are skilled craftsmen with decades of experience doing things no one in the world is doing. Our brands complement and build on one another.

Authentic Artisanship

We provide world-class quality and depth of detail in every product, with delicate and deliberate material selection and a limitless product offering.

Featured Project

Phillips Exeter Academy Library
Exeter, NH

Architect
Louis Kahn

Photography
Steve Rosenthan

Commissioned in 1965 to world-famous architect, Louis Kahn, the Exeter Library is a pillar of studied architecture. Duratherm founder Philip Cole provided all the millwork for this project, including windows, study carrels and paneling. It was his work with Louis Kahn on this project that inspired Cole to found a company specializing in monumental teak windows for institutional and commercial use.