DIRTT Environmental Solutions Ltd.

Item 1.01. Entry into a Material Definitive Agreement. BDC Facility Funding On September 18, 2026, DIRTT Environmental Solutions Ltd. (the “Company”) received the final C$5.0million disbursement under the Company’s previously disclosed credit facility (the “BDC Facility”) with Business Development Bank of Canada (“BDC”). The Company has now received the full C$15.0 million gross financing commitment under the BDC Facility. As previously disclosed, the BDC Facility is a secured term loan facility that matures on April 30, 2032 and bears interest at BDC’s floating base rate less 0.75%. The terms of the BDC Facility were previously disclosed in the Company’s Current Report on Form 8-Kfiled with the Securities and Exchange Commission on December 11, 2025 and are incorporated herein by reference. Letter of Credit In connection with, and as a condition to receiving, the funding under the BDC Facility, Royal Bank of Canada (the “Lender”) issued an irrevocable standby letter of credit, dated September 15, 2026 (the “Letter of Credit”), in favor of BDC for the account of the Company, in an aggregate amount of C$3.5 million. The Letter of Credit is available to BDC upon written demand in the form specified in the Letter of Credit and may be drawn upon in partial or multiple drawings. The Letter of Credit has an initial term of one year and is automatically extended for successive one-year periods unless the Lender gives notice of non-renewal. The foregoing description of the Letter of Credit does not purport to be complete and is qualified in its entirety by reference to the full text of the Letter of Credit, a copy of which is filed as Exhibit 10.1 to this Current Report on Form 8-K, and is incorporated herein by reference.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure provided in Item 1.01 “Entry into a Material Definitive Agreement” is incorporated by reference into this Item 2.03 as if fully set forth herein.

Item 7.01. Regulation FD Disclosure. The Company issued a press release announcing the funding on September 21, 2026. A copy of that press release is furnished as Exhibit 99.1 to this Current Report and incorporated into this Item 7.01 by reference. The information set forth under Item 7.01 and in Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.