Security Builders Supply Company is the commercial division of Security Lumber and Supply. Security Lumber and Supply has been serving general contractors & builders and for over 62 years. The door and window commercial division is located in Oswego, Illinois. We stock major manufacturers: Marvin SiverLine Therma True Wausau Simpson AndersonWe specialize in Steel Doors, Steel Frames, Pre-Machined Wood Doors, Pre-Finished Wood Doors, and Door Hardware for commercial use. Brand Names: Steelcraft, Seco, CurriesCall us to supply your doors and hardware for Government jobs, School jobs, and Hospital jobs. We offer delivery to your work site.