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IEI is committed to our clients' satisfaction, expectations, and requirements. Our cohesive team of project managers and engineers collaborate with our clients to meet their aesthetic, functional, and financial needs while ensuring that all projects are delivered on schedule, within budget and with technical excellence. This continued commitment to turning our clients' mission and vision into a reality is evident in our high volume of repeat business and long-term client relationships.

IEI maintains strong, effective relationships with numerous architectural and engineering firms and many local, state and federally funded agencies including, but not limited to, the following:


  • Chicago Department of Aviation
  • Chicago Department of Transportation 
  • Chicago Department of Water Management 
  • Chicago Housing Authority 
  • Chicago Park District 
  • Chicago Public Building Commission 
  • Chicago Public Schools 
  • Chicago Transit Authority 
  • City of Evanston 
  • City of Peoria
  • College of DuPage 
  • Commonwealth Edison 
  • Cook County Highway Department 
  • Illinois Capital Development Board 
  • Illinois Department of Transportation 
  • Illinois State Toll Highway Authority 
  • Metra 
  • Metropolitan Water Reclamation District of Greater Chicago 
  • Peoria County
  • United Airlines


  • Indiana Department of Transportation
  • Indiana Stadium and Convention Building Authority
  • Indianapolis Department of Public Works
  • Indianapolis International Airport
  • Indianapolis Parks and Recreation
  • Lawrence Township School District
  • Purdue University


  • City of Omaha
  • Omaha Public Schools