303rd Engineering Group, LLC

Successful Partnerships, Successful Projects

In Twenty years, the 303rd Engineering Group has logged over 2000+ successful projects, 85% of them for repeat customers. As a full-service MEP firm, the 303rd provides engineering expertise for the following:

  • Architects
  • Design / Build Contractors
  • Government Agencies

Whatever the size or scope of your project, the 303rd can handle it. Past high-profile jobs include the new Airmen’s Dormitories at Scott Air Force Base; the Naval Special Weapons facility in Crane, Indiana; New Campground facilities and Visitor’s Center at Johnson Shut-Ins State Park, Missouri; hospitals for the Missouri Department of Mental Health, and the Cancer Treatment Center in Swansea, Illinois. In addition, we have provided engineering design for numerous Churches, Libraries, Schools, Commercial Buildings and Assisted-living facilities throughout Missouri and Illinois.



The 303rd Engineering Group is a St. Louis, Missouri based professional engineering firm offering services for Mechanical / HVAC, Electrical and Plumbing design. With clients from both the public and private sector, our project types include Government, Healthcare, Commercial, Industrial, Residential and Institutional. The company was started in 2005 by Charles K. Fiedler, a professional engineer with over 40 years of experience in consulting electrical engineering.

Our company name was inspired by 2nd LT Joseph J. Nevills (Underlined in Picture) and his World War II experience as a bombardier on a B-17 "Flying Fortress" in the 303rd Bombardment Group.

10420 Baur Blvd., St. Louis MO. 63132

314-664-3382