About Longzhengsheng Looking for a reliable door supplier you can truly trust?

At Longzhengsheng, we get it: when you’re working on a critical project, the last thing you need is a supplier that cuts corners, misses deadlines, or piles on hidden middleman markup. That’s why for over 10 years, we’ve focused on being the kind of partner we’d want to work with ourselves.

We’re a direct, ISO-certified door manufacturer, with two large production bases and a 33,333 sq.m production facility. As the original factory, we cut out all the middlemen—so you get premium, safety-certified doors at factory-direct prices, no hidden costs, no extra markup.

All our doors are built with high-grade galvanized steel, using eco-friendly non-toxic materials, and tested to exceed global fire and safety standards. We offer 50+ customizable solutions—from fire doors to industrial doors, medical doors to garage doors—tailored exactly to your project’s needs.

With 16 national patents, strict quality control, and fast 7-day lead times, we’ve earned the trust of hundreds of clients worldwide. We don’t just deliver doors—we deliver peace of mind, keeping your project on schedule, on budget, and fully up to code.

Tell us about your project, and let’s build something great together.