Commencement of commercial production/operations

Date: 06th November, 2026 To, To, National Stock Exchange of India Ltd., BSE Limited Exchange Plaza, C-1, Block G, Phiroze Jeejeebhoy Towers Bandra Kurla Complex, Bandra (E), Dalal Street Mumbai – 400 051 Mumbai- 400001 NSE Scrip Symbol: INTERARCH BSE Scrip Code 544232 Subject: Disclosure under Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 – Commencement of Commercial Production and Capacity Addition of Phase-2 at its Manufacturing Facility at Kheda Gujrat Unit-1. Dear Sir/Madam, Pursuant to Regulation 30 read with Para B of Part A of Schedule III of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 ("SEBI Listing Regulations"), we wish to inform you that the Company has commenced commercial production of Phase-2 at its manufacturing facility located at Kheda, Gujarat Unit-1 with effect from 05th November’2026. The commencement of commercial production marks a significant milestone in the Company's expansion plans. The commissioning of the facility has resulted in an enhancement of the Company's manufacturing capacity. Consequent to the above capacity addition, the Company's total installed manufacturing capacity has increased from 245,000 MT to 265,000 MT with effect from 05th November’2026. The details as required under Regulation 30 of the SEBI Listing Regulations read with the SEBI Master Circular No. HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated 30thJanuary, 2026 (“SEBI Circular”), are provided in Annexure A enclosed herewith. INTERARCH BUILDING SOLUTIONS LIMITED (Formerly known as Interarch Building Products Limited) Head Office : B-30, Sector 57, Noida - 201301, India. Tel.: +91 120 4170200, CIN: L45201DL1983PLC017029 Registered Office: Farm No-8, Khasra No. 56/23/2, Dera Mandi Road, Mandi Village, Tehsil Mehrauli, New Delhi - 110047, India. Kindly take the above information on record. Thanking you. Yours faithfully, For INTERARCH BUILDING SOLUTIONS LIMITED (formerly Interarch Building Products Limited) NIDHI KHANDELWAL COMPANY SECRETARY & COMPLIANCE OFFICER M.No.: A19279 INTERARCH BUILDING SOLUTIONS LIMITED (Formerly known as Interarch Building Products Limited) Head Office : B-30, Sector 57, Noida - 201301, India. Tel.: +91 120 4170200, CIN: L45201DL1983PLC017029 Registered Office: Farm No-8, Khasra No. 56/23/2, Dera Mandi Road, Mandi Village, Tehsil Mehrauli, New Delhi - 110047, India. Annexure A Disclosure pursuant to Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 read with the applicable SEBI Master Circular HO/49/14/14(7)2025-CFD- POD2/I/3762/2026 dated 30th January, 2026 (“SEBI Circular”) Particulars Details Existing Capacity (Installed capacity of the Company prior to commencement 245,000 MT of commercial production at the new facility). Existing Capacity Utilisation 80% Capacity Addition(Gujarat phase-1) 20,000 MT Period within which the Capacity was Q3 – FY 26-27 Added Investment Required 15 Cr Mode of Financing Internal accruals/IPO Proceeds The capacity addition has been undertaken to augment the Company's manufacturing capabilities, cater to the Rationale increasing demand for its products, improve operational efficiencies, and support the Company's long-term growth strategy. Kindly take the above information on record. Thanking You, For INTERARCH BUILDING SOLUTIONS LIMITED (formerly Interarch Building Products Limited) NIDHI KHANDELWAL COMPANY SECRETAY & COMPLIANCE OFFICER M.No.: A19279 INTERARCH BUILDING SOLUTIONS LIMITED (Formerly known as Interarch Building Products Limited) Head Office : B-30, Sector 57, Noida - 201301, India. Tel.: +91 120 4170200, CIN: L45201DL1983PLC017029 Registered Office: Farm No-8, Khasra No. 56/23/2, Dera Mandi Road, Mandi Village, Tehsil Mehrauli, New Delhi - 110047, India.