Since 1945, Platt & LaBonia Company LLC has been designing and delivering custom steel fabrication products with an uncompromising commitment to quality and service. Our plant is located in North Haven, Connecticut. Using only high quality materials, skilled technicians, innovative ideas and experienced engineers, we continue to meet the industry’s highest performance standards. Regardless of the nature of your product — from simple construction to complex projects — Platt & LaBonia Company LLC takes pride in the ability to respond quickly and cost effectively to customer needs, measuring up to your most rigid specifications and manufacturing products that you can be proud of. Platt & LaBonia Company LLC is ISO 9001:2015 Certified.