Wyoming State Capitol

Wyoming State Capitol

Cheyenne, Wyoming
United States

TYLin provided structural engineering services for the restoration of Wyoming’s State Capitol building.

This project restored much of the State Capitol building’s grandeur of the past. This project was a continuation of the Wyoming State Capitol Square master plan, which involved an assessment and investigation of the 130-year-old National Historic Landmark. The late 1800s Renaissance Revival building is also listed on the National Register of Historic Places. 

Located in Cheyenne, Wyoming, the 504,000-square-foot building was outfitted with new mechanical, electrical, plumbing, fire protection, and information technology/audio-visual systems. The systems were routed throughout the building’s various structural systems, which included timber, steel, corrugated iron arches, and cast-in-place concrete.  

To incorporate the new systems without impacting the existing historic spaces, the team designed the underpinning of the load-bearing masonry walls to allow routing of new below-grade mechanical systems. The original heating shafts were removed and reconstructed to provide pathways for the new systems. 

Project Highlights:

  • A third-floor infill was removed to reconstruct a two-story historic Supreme Court Chamber and viewing gallery. 
  • By relocating the elevators, the team was able to open the central corridor and reconnect the House and Senate Chambers. 
  • The project architect was HDR Architecture.  


Gold Award, 2020
BD+C Reconstruction Awards
Excellence in Safety Award of Merit, 2020
ENR Mountain States Best Projects
Excellence in Renovation/Restoration Award of Merit, 2020
ENR Mountain States Best Projects
ACE Award Winner, Best Building Project over $70 Million – General Contractor, 2019
Associated General Contractors of Colorado ACE Awards

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