UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 10, 2014

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NCI BUILDING SYSTEMS, INC.

(Exact name of registrant as specified in its charter)

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Registrant’s telephone number, including area code: (281) 897-7788

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 2.02. Results of Operations and Financial Condition.

On June 10, 2014, NCI Building Systems, Inc. (“NCI”) issued a press release (the “Press Release”) announcing NCI’s financial results for the fiscal second quarter and fiscal year ended May 4, 2014. A copy of the Press Release is attached as Exhibit 99.1.

NCI’s Press Release includes Adjusted EBITDA, Adjusted Operating Income (Loss), Adjusted Net Loss Applicable to Common Shares and Adjusted Net Loss Per Diluted Common Share, which are non-GAAP financial measures. Adjusted EBITDA excludes acquisition-related costs, executive retirement charges, share-based compensation costs, gain on embedded derivative, asset impairments (recoveries), debt extinguishment costs, net, gain on insurance recovery, unreimbursed business interruption costs and secondary offering costs. Adjusted Operating Income (Loss) excludes gain on insurance recovery and secondary offering costs. Adjusted Net Loss Applicable to Common Shares and Adjusted Net Loss Per Diluted Common Share exclude gain on insurance recovery, net of taxes, secondary offering costs, net of taxes and foreign exchange loss (gain), net of taxes. Adjusted EBITDA is calculated based on the terms contained in NCI’s term loan credit agreement. Adjusted EBITDA, Adjusted Operating Income (Loss), Adjusted Net Loss Applicable to Common Shares and Adjusted Loss Per Diluted Common Share are measures used by management and, therefore, provided to investors to provide comparability between periods of underlying operational results. Adjusted EBITDA, Adjusted Operating Income (Loss), Adjusted Net Loss Applicable to Common Shares and Adjusted Net Loss Per Diluted Common Share should not be considered in isolation or as substitutes for operating income (loss), net income (loss), net loss per diluted common share or net loss applicable to common shares determined in accordance with generally accepted accounting principles in the United States. The non-GAAP financial measures and reconciliations thereof to the most directly comparable measures prepared in accordance with generally accepted accounting principles are included in the Press Release furnished as Exhibit 99.1 hereto.

Attached hereto as Exhibit 99.2 is financial information and commentary by Mark E. Johnson, Executive Vice President, Chief Financial Officer and Treasurer of NCI, regarding results for the fiscal second quarter ended May 4, 2014 and forward-looking statements relating to the fiscal third quarter ended August 31, 2014 (the “CFO Commentary”). The CFO Commentary will be posted on the company’s website, www.ncibuildingsystems.com, on June 10, 2014.

The CFO Commentary includes Adjusted EBITDA which is a non-GAAP financial measure. Adjusted EBITDA excludes acquisition-related costs, executive retirement charges, share-based compensation costs, gain on embedded derivative, asset impairments (recoveries), debt extinguishment costs, net, gain on insurance recovery, unreimbursed business interruption costs and secondary offering costs. Adjusted EBITDA is a measure used by management and, therefore, provided to investors to provide comparability between periods of underlying operational results. Adjusted EBITDA should not be considered in isolation or as a substitute for net income (loss) determined in accordance with generally accepted accounting principles in the United States. The non-GAAP financial measure and reconciliation thereof to the most directly comparable measure prepared in accordance with generally accepted accounting principles is included in the CFO Commentary furnished as Exhibit 99.2 hereto.

The information in this Item 2.02, and in Exhibit 99.1 and Exhibit 99.2 which are attached to this Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liabilities of that Section, nor shall they be deemed incorporated by reference in any registration statement or other filing under the Securities Act of 1933, as amended, or the Exchange Act, except in the event that NCI expressly states that such information is to be considered “filed” under the Exchange Act or incorporates it by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Dated: June 10, 2014

EXHIBIT INDEX