Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Registration Statement on Form S-1 of our report dated November 29, 2016, relating to the consolidated financial statements and financial statement schedules of Atkore International Group Inc. and subsidiaries, appearing in the Prospectus, which is a part of this Registration Statement, and to the reference to us under the heading “Experts” in such Prospectus.

/s/ Deloitte & Touche LLP

Chicago, Illinois

February 7, 2017