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| Subsidiary | | Jurisdiction of Incorporation |
| | |
| Aerial Lighting & Electric, Inc. | | Connecticut |
| Azimuth Communications, Inc. | | Oregon |
| Calumet Armature and Electric, L.L.C. | | Illinois |
| Freeman Enclosure Systems, LLC | | Ohio |
| HK Engine Components, LLC | | Indiana |
| Hotchkiss Alarms, LLC | | Connecticut |
| ICS Holdings LLC | | Arizona |
| IES Commercial, Inc. | | Delaware |
| IES Communications, LLC | | Delaware |
| IES Consolidation, LLC | | Delaware |
| IES Infrastructure Solutions, LLC | | Delaware |
| IES Management, LP | | Texas |
| IES Management ROO, LP | | Texas |
| IES Operations Group, Inc. | | Delaware |
| IES Residential, Inc. | | Delaware |
| IES Shared Services, Inc. | | Delaware |
| IES Subsidiary Holdings, Inc. | | Delaware |
| Integrated Electrical Finance, Inc. | | Delaware |
| Key Electrical Supply, Inc. | | Texas |
| Magnetech Industrial Services, Inc. | | Indiana |
| NEXT Electric, LLC | | Wisconsin |
| Plant Power and Control Systems, L.L.C. | | Alabama |
| Southern Industrial Sales and Services, Inc. | | Georgia |
| STR Mechanical, LLC | | North Carolina |
| Technibus, Inc. | | Delaware |
| Technical Services II, LLC | | Virginia |
| Thomas Popp & Company | | Ohio |