TOSTEM is one of the largest building material brands in Japan and holds the top market share in the aluminum doors, windows, and curtain walls market. It is a comprehensive residential building material manufacturer.

Since 1967, TOSTEM has been designing and manufacturing aluminum windows, always striving for the highest quality rather than simply imitating what others have done. Over the years, as lifestyles and customer expectations have evolved and diversified, TOSTEM has continuously developed to meet their needs and improve the performance and comfort of homes. TOSTEM’s products connect people with nature while protecting them from natural elements – durable interfaces that enhance comfort and happiness.

In Japan, TOSTEM is driving the advancement of windows through advanced technologies, including TOSTEM’s “Intelligent Light Structure,” which achieves maximum insulation with high-performance five-layer glass while reducing weight, and the “Inner Frame Structure” that improves design and maximizes glass surface area. For entrance doors, TOSTEM is introducing new technologies such as locking systems that provide security and convenience, as well as automation systems for opening and closing sliding entrance doors.

Lifestyles are constantly evolving, and TOSTEM adapts to these changing times by continuously innovating and enriching the world around us. TOSTEM leads in new technologies in Japan and worldwide, focusing on outstanding design and usability.