APOGEE ENTERPRISES, INC.

a)Evaluation of disclosure controls and procedures: As of the end of the period covered by this report (the Evaluation Date), we carried out an evaluation, under the supervision and with the participation of management, including the Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) of the Securities Exchange Act of 1934, as amended (the Exchange Act)). Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that, as of the Evaluation Date, our disclosure controls and procedures were effective to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in applicable rules and forms, and (ii) accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosure.

b)On July 1, 2026, we completed our acquisition of Kalwall. In accordance with Securities Exchange Commission guidance permitting a company to exclude an acquired business from management’s assessment of the effectiveness of internal control over financial reporting for the year in which the acquisition is completed, we have excluded Kalwall from our assessment of the effectiveness of internal control over financial reporting as of August 29, 2026. The assets and net sales of Kalwall that were excluded from our assessment constituted approximately 10% and 4%, respectively, of the related consolidated financial statement amounts as of and for the three months ended August 29, 2026. The scope of management’s assessment of the effectiveness of the design and operation of our disclosure controls and procedures as of August 29, 2026 includes all of our consolidated operations except for those disclosure controls and procedures of Kalwall. See Note 13 for additional information regarding the Kalwall acquisition. Based on

our assessment, the Company's management believes that, as of August 29, 2026, the Company's internal control over financial reporting was effective based on those criteria.

c)Changes in internal controls: There was no change in the Company’s internal control over financial reporting that occurred during the fiscal quarter ended August 29, 2026, that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.