New Millennium Building Systems
Steel Joist

Nationwide supplier of steel joists, steel roof and floor decking, and castellated and cellular beams

Steel Joist Institute, ANSI, Steel Deck Institute SJI ANSI SDI

New Millennium is your unparalleled resource for competitive structural steel solutions. We are a division of Steel Dynamics, the 5th largest steel supplier in the US. With seven locations, including four steel deck plants, we can meet or accelerate most any project timeline.


  • Architectural special profile steel joist expertise
  • Engineer unnecessary production costs out of your project
  • Reduce or prevent clashes, delays and related supplier costs
  • Easier, friendlier and faster RFI process
  • Flexible delivery options: staged and just-in-time

Simplify your design process with Dynamic Joist®, the industry's leading 3D BIM digital steel joist design component.

Building a Better Steel Experience


Steel Dynamics, Inc

New Millennium Building Systems is a wholly owned subsidiary of Steel Dynamics Inc.

Flexbile to the Finish