Steel Window Institute

We were founded in 1920 as an association of the leading manufacturers of windows and doors made from hot-rolled purpose-made steel sections. Our member companies represent over 300 collective years in the industry, demonstrating our deep expertise and long-standing commitment to excellence. We comply with voluntary specifications for steel windows and doors, which establish a standard of excellence through rigorous testing for air, water, and structural requirements. Our specialized skills ensure that users benefit from continual advances in the design, manufacture, and application of these architectural products. We provide the public with comprehensive general and technical information, offering clear instructions on the intent, performance, and construction of our industry's offerings. Generations of architects worldwide have relied on us to supply products for use in virtually every conceivable setting, from traditional historical structures to the most contemporary buildings.

We help define the minimum performance requirements to precisely meet the needs of architects, specifiers, homeowners, and developers. Our standards cover many varieties of steel windows, including fixed, ventilated, hot-rolled, cold formed, fire rated, and blast- and hurricane-resistant options. We also maintain detailed specifications for several types of entrance and interior doors alongside custom formed steel elements. By consistently leading the industry in proven durability, strength, function, and aesthetics, we solve complex architectural challenges. We remain dedicated to providing authoritative references that ensure the highest quality and standards are applied to all materials and products. Our organization is committed to full transparency, offering proprietary specifications produced by each member directly upon request.