Locations | United States
St. Louis, Missouri
Delivering Industry Innovations Grounded in Local Tradition
Burns & McDonnell serves the St. Louis metropolitan area from two offices: St. Louis and O’Fallon, Illinois. The employee-owners provide depth of experience with a focus on cost-effective, innovative solutions that make our clients successful.
Listed in the top 10 percent of U.S. engineering firms, Burns & McDonnell-St. Louis has served the metropolitan area's needs since 1989, delivering a wide range of projects from aviation to roads and bridges to cybersecurity, water and wastewater to labs and clean rooms, power generation, defense facilities and air quality improvements. We're proud to be part of the rich engineering history in the region.
A 100 percent employee-owned firm, Burns & McDonnell fosters a continuity of client service that is a function of our commitment to proactive communication and low staff turnover.
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Honors & Rankings
2026
in Top Design Firms
ENR Midwest
2026
in Top Design Firms - Missouri
ENR Midwest
2026
Largest Engineering Firms in St. Louis
St. Louis Business Journal
2026
Healthiest Employers of St. Louis
HealthiestEmployers.com
Projects
Wastewater Treatment Plant Expansion
Limestone Ridge Reliability Project
Headworks Improvements & LTCP Review
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