Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our firm under the caption “Experts” in the Registration Statements on FormS-3 (File Nos.333-186786 and333-215071), as amended, and related Prospectus of IES Holdings, Inc. for the registration of 12,400,301 shares of its common stock and preferred stock purchase rights and to the incorporation by reference therein of our reports dated December 8, 2017, with respect to the consolidated financial statements of IES Holdings, Inc., and the effectiveness of internal control over financial reporting of IES Holdings, Inc., included in its Annual Report (Form10-K) for the year ended September 30, 2017, filed with the Securities and Exchange Commission.
/s/ ERNST & YOUNG LLP
Houston, Texas
August 1, 2018
