Established in 2014, Grandex Door Solutions Co., Ltd. has evolved into a global powerhouse for precision-engineered entry systems. Operating from a 35,000 m² facility, we combine 16 years of expertise to provide Seattle’s architects and developers with high-performance lift-sliding systems designed to withstand the Pacific Northwest's unique climate.
Our commitment to E-E-A-T is evidenced by our 85 specialized R&D engineers and 45-member QA team. In a city defined by indoor-outdoor living, our systems provide the airtight security and thermal efficiency required for sustainable building codes.
Seattle’s real estate market requires suppliers who understand the "Emerald City" building standards. Grandex integrates global supply chain power with local compliance. Our 1,200+ partner network ensures that even in complex supply environments, your project timelines are maintained. We specialize in bespoke architectural hardware, integrating advanced thermal-break technology suitable for both the wet Seattle winters and the high-performance building requirements of modern Washington State developments.
Our ISO 9001 certification and rigorous third-party lab verification ensure every door meets the stringent quality requirements for North American building codes.
Yes, our 85 engineers provide full-scale customization, including dimensions, surface finishes, and security locking mechanisms tailored for luxury residential or commercial use.
Grandex Door
