Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the following Registration Statements:
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| NCI Building Systems, Inc. Form S-8 | File No. 333-186467 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-176737 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-193057 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-173417 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-172822 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-166279 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-162568 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-139983 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-124266 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-111142 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-111139 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-34899 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-14957 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-12921 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-225973 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-225974 |
| NCI Building Systems, Inc. Form S-8 | File No. 333-224001 |
| NCI Building Systems, Inc. Form S-3 | File No. 333-210467 |
of our report dated December 19, 2018 (except with respect to the effects of the change in the composition of reportable segments, change in the income statement presentation of service cost and other components for defined benefit pension and other postretirement benefit plans, and change in presentation of restricted cash in the statement of cash flows as discussed in Notes 1, 3, and 20 as to which the date is February 19, 2019) with respect to the consolidated financial statements of NCI Building Systems, Inc. and our report dated December 19, 2018, with respect to the effectiveness of internal control over financial reporting of NCI Building Systems, Inc., included in this Current Report on Form 8-K.
/s/ Ernst & Young LLP
February 19, 2019
Houston, Texas
