- A.K.D. Development, Ltd.
- ADM/XpressTrade
- Aerico
- Affiliated Engineering
- Air Con Mechanical
- Air Systems Design, Ltd.
- Amber Mechanical
- American Standard
- A.O. Smith
- ARCADIS U.S., Inc.
- Armstrong International
- Arnold & O'Sheridan
- Aurora
- Autodesk
- BP/Amoco Oil Company
- Applied Air
- Applied Controls & Contracting Services Inc.
- ArCon International Ltd.
- Armacell
- Aspira
- Ast & Dagdelen
- AT&T Wireless
- Baltimore AirCoil
- Barry Thomas Plumbing
- Bauer Latoza Studio
- Bearsch Compeau Knudson
- Bell & Gossett
- Bella Maison
- Belli & Belli Architects
- Block Electric
- Blue Cross Blue Shields of Illinois
- Bo-berg Communications
- Brady
- Bradley
- Bresler’s Ice Cream & Yogurt
- Brizo
- Caffe DeLucca
- Canon Design
- Catholic Charities
- CECO Inc.
- Commnet Wireless Communcations
- Continental Electric
- Charles Sparks + Co.
- Chicago Conditionaire Co.
- Chicago Housing Authority
- Chicago Metallic
- Chicago Metal Rolled Products
- Chicago Park District
- Chicago Public Schools
- ClimateMaster
- Construction Cost Systems, Inc.
- Consulting for Architects Inc.
- Cooper B-Line
- Cooper Bussmann
- Corporate Real Estate Services
- Crane Pumps
- Danfoss
- Daniel Dolan Architects
- Daniel Electrical Enterprises
- Dann Dee Display Fixtures
- Dave Witt & Associates
- DeFranco Plumbing
- Delta Faucet Company
- Diamond Bank
- DKA Architects
- Downeast Design Group Inc.
- Durkin Electric
- EHMS, Inc.
- Environmental System Design
- Epstein
- Ermco, Inc.
- e-Quality Electric, Inc.
- Finch University / Chicago School of Medicine
- Fire & Life Safety America
- Focal Point
- Forbes Electric
- Frankel + Coleman
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- Gallagher Plumbing
- GANCOM
- GE
- Geary Electric
- Gensler
- Gerber
- Gibson Electric
- Gilbane
- Gilfillan Callahan Nelson Architects
- Globetrotters International
- Goss / Pasma Architects
- Goulds
- Graycor
- Griskelis & Smith Architects
- Grumman/Butkus Associates
- Guajardo Associates LLC Architects
- Gurtz Electric
- Harry J. Betley Architects
- Heitman Architects
- Hill Mechanical
- HUB International
- I.A.E.
- ICOR Associates, LLC
- Image by Design
- ISACA
- ITT
- J. Walter Thompson
- Jamerson & Bauwens Elec.
- Jaros, Baum & Bolles
- Joe Koenen Engineering
- Joel Scheckerman Associates, Ltd.
- Johnson Controls
- Kerry G. Wilson & Associates
- Klaucens & Associated, Inc.
- Knight Architects
- Kroeschell Engineering Co.
- Krueger
- K-TEK Solutions, Inc.
- Loft Development
- Lutron
- Macondo Corporation
- Maples Plumbing
- Maron Electric
- MasterGraphics
- Matrix Engineering
- Metraflex
- McDonald’s Corporation
- McDonough Mechanical Services, Inc.
- Meade Electric
- MEP Associates, LLC
- MEP CAD Services, LLC
- MET Merchandising Concepts
- Mestek
- MH Electric Motor & Control Corp.
- Mid illinois Mechanical, Inc.
- MK Industries
- MODE Architects
- Mortensen
- Museum of Science & Industry
- NAMCA
- National Survey Service, Ltd.
- Nemetschek Systems
- Nia Architects Ltd.
- NIBCO
- Nortec
- NYSAN
- O' Hare Mechanical Contractors Inc.
- O & M Industries
- OMICRON
- O' Sullivan Plumbing
- Panto-Ulema
- Patterson
- PCI
- PennBarry
- Pentair
- Pepper Construction – Chicago
- Pepper Construction – Indiana
- Phoenix Technical
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- Power Construction
- Proactive Worldwide
- PrimeCo Personal Communications
- Prudential Lighting
- Primera Engineers & Architects
- Psychological Software Solutions
- Public Building Commission
- RBE Company
- RGLA Inc.
- Richard Knorr International
- Robotech CAD Solutions
- Rosalind Franklin University
- Rosenthal Collins Group
- RTM & Associates, Inc.
- Rugo Raff Architects
- R.V. Anderson Associates Ltd.
- Sal Electric Company, Inc.
- Schott
- SEH
- Shafer Architects
- Sherman Mechanical
- Skanska
- Skidmore, Owings & Merrill
- Slayden Construction Group, Inc.
- SmithGroup
- Smith Seckman Reid
- SMNG Architects
- SNAProducts
- Soos & Associates
- Sound Living
- Sparks Architects
- SSM Mechanical
- Stainless Drains
- Starbucks Coffee Company
- Steiner Company Inc.
- Studio GC
- Studley
- Super Electric
- SW Building Performance Group
- Swisslog
- Synch Solutions
- Syntific Corporation
- Syska Hennessey Group
- Taco
- Terry Plumbing
- Tetra Tech Inc.
- The Architects Enterprise, Ltd.
- The Catherine Cook School
- The Hearn Company
- THE MORSE GROUP, INC.
- The Papers
- Titus
- Toto
- Tuttle & Bailey
- Turner Construction
- Turner + DeCelles
- TVS Interiors
- U.S. Cellular
- U.S. Fire Protection
- U.S. Postal Service
- Urban Resource
- Valve Studios
- Vendrell Studios
- Verizon Wireless
- Victaulic
- Vincent Ziolkowski Associates, Ltd.
- VMI Mechancial
- Walsh Construction
- Waterless Urinal Company
- Waukegan Steel
- Weese Langley Weese
- Widler Architectural
- Wilkinson Blender Architecture
- WMA Engineers
- Wright Inc.
- YMI Mechanical
- Zalk Josephs Fabricators
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