KOR‑Glass is a trusted local provider of steel and sectional commercial doors in Ontario, CA, and surrounding cities including Chino, Fontana, Rancho Cucamonga, Temecula and Riverside. We offer both insulated and non-insulated overhead doors built to withstand tough industrial and commercial environments. Whether you're replacing an old system or starting new construction, we’ll guide you through material selection, hardware compatibility, and code compliance—ensuring your doors enhance safety and operational flow.

“Strength Meets Function in Every Commercial

Door We Install”

When you choose KOR‑Glass for steel or sectional commercial doors, you're getting more than just a product—you’re getting a custom solution backed by decades of industry knowledge. Our doors are built to handle frequent use, temperature swings, and demanding industrial conditions. Whether you need overhead doors for a distribution center or secure steel roll-ups for a warehouse, we install doors that last and perform. Contact KOR‑Glass today for the best in commercial door installation near Ontario, CA, and throughout the Inland Empire.