Security Door Inc. (SDi) is a leading all-union worker security installation company serving Northwest Indiana and the Chicagoland area. Specializing in high-grade perimeter fencing, electronic entry systems, overhead doors, access controls, and video surveillance, SDi offers top-quality security solutions for commercial and industrial needs.
With a focus on providing the highest level of security for businesses, SDi also offers services such as perimeter security, entrance gates, anti-terrorism products, dock equipment, security gates, guardrails, handrails, personnel doors, and turnstiles. Trusted by Northwest Indiana's biggest corporations, SDi is known for its reliable and professional approach to commercial security solutions.
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