Intimation under Regulation 30 of the SEBI (LODR) Regulations, 2015 regarding the press release.

Date: 24.09.2026 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: Intimation under Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015 regarding the press release Dear Sir/Ma’am, Pursuant to Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015, we hereby enclose a copy of the press release titled “Interarch Inaugurates Advanced Heavy Structural Steel Manufacturing Facility in Attivaram, Andhra Pradesh”. Thanking You, For INTERARCH BUILDING SOLUTIONS LIMITED (Formerly Known as Interarch Building Products Limited) ARVIND NANDA MANAGING DIRECTOR DIN: 00149426 INTERARCH BUILDING SOLUTIONS LIMITED (Formerly known as Interarch Building Products Limited) Corporate 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. Press Release Interarch Inaugurates Advanced Heavy Structural Steel Manufacturing Facility in Attivaram, Andhra Pradesh  New facility strengthens Interarch’s capabilities in heavy structural steel and complex steel structures  Phase I capacity of 24,000 MT per annum to cater to high-growth sectors across South and West India  State-of-the-art manufacturing infrastructure equipped with advanced high precision machinery sourced from Europe and India  Facility caters to high-rise buildings, data centres, semiconductor and electronics facilities, renewable energy projects, EV infrastructure, and other heavy industrial projects. 24 September 2026: Interarch Building Solutions Limited (BSE: 544232 | NSE: INTERARCH), a leading provider of turnkey steel construction solutions, today inaugurated its new heavy structural steel manufacturing facility at Attivaram, Andhra Pradesh, marking a significant expansion of its capabilities in the design and manufacture of complex steel structures. The facility has been developed to address the increasing requirement for heavy and high- performance structural steel in projects where scale, precision and engineering complexity are critical. It will enable Interarch to manufacture structural components for applications ranging from high-rise buildings and data centres to semiconductor and electronics facilities, renewable energy projects, EV infrastructure and large industrial developments. Built across approximately 20 acres, the Phase 1 utilises around 25,000 sq. m. of built-up area and has an initial manufacturing capacity of 24,000 MT per annum. This plant is equipped with specialised equipment sourced from leading technology providers in Europe and India, enabling high-precision fabrication and the manufacturing of complex heavy structural members. The balance land is earmarked for the development of Phases 2 and 3, of which the civil works for Phase 2 currently underway. A key feature of the facility is its ability to undertake demanding fabrication requirements, including large-sized hot-rolled sections and plate girder structural members, designed for projects with stringent engineering and dimensional specifications. This facility expands Interarch’s manufacturing portfolio beyond conventional PEB applications and strengthens its ability to participate in projects requiring sophisticated and heavy structural steel solutions. INTERARCH BUILDING SOLUTIONS LIMITED (Formerly known as Interarch Building Products Limited) Corporate 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. Located in Andhra Pradesh, the facility also provides a strategic manufacturing base for servicing customers across South and West India. Its proximity to industrial clusters, ports and major transportation networks is expected to support efficient movement of materials and finished structures to project locations. The new facility complements Interarch’s existing manufacturing ecosystem in Attivaram. The company had earlier commissioned Phase 2 of its PEB facility at the location, with an installed capacity of 24,000 MT per annum and an investment of approximately ₹32 crore, making Attivaram an increasingly important manufacturing hub for Interarch’s steel construction operations. Mr. Arvind Nanda, Managing Director, Interarch Building Solutions Ltd, said, “The inauguration of our Attivaram facility marks a significant milestone in Interarch’s evolution as a comprehensive steel construction solutions provider. India is entering a phase of accelerated industrial and infrastructure development, creating demand for steel structures that are larger, more sophisticated and engineered for greater performance. This facility strengthens our ability to participate in that opportunity with enhanced manufacturing depth and a broader portfolio of capabilities. Our focus is not simply on adding capacity, but on building the technological and execution capabilities required to support the next generation of industrial and infrastructure projects.” Mr. Gautam Suri, Whole-Time Director, Interarch Building Solutions Ltd, said, “Attivaram represents a significant advancement in our heavy structural steel manufacturing capabilities. The facility brings together advanced machinery, precision fabrication and specialised manufacturing processes to address structural requirements that demand a high degree of engineering accuracy and execution excellence. From heavy structural members to complex assemblies, our objective is to deliver consistent quality at scale while meeting the increasingly demanding specifications of modern construction. This capability will enable us to take on more complex projects and translate innovative structural designs into efficiently manufactured, high-quality steel solutions.” The inauguration of the Attivaram facility further strengthens Interarch’s evolution as an integrated steel construction solutions provider, bringing together engineering, manufacturing and project execution capabilities to serve a broader spectrum of steel- intensive applications. INTERARCH BUILDING SOLUTIONS LIMITED (Formerly known as Interarch Building Products Limited) Corporate 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. About Interarch Building Solutions Limited Interarch Pre- Pre-Engineered Buildings Interarch Building Solutions Limited commenced its operations in 1983. Today, 40 years later, Interarch is one of the leading turnkey pre-engineered steel construction solution providers in India with integrated facilities for design and engineering, manufacturing, and on-site project management capabilities for the installation and erection of pre-engineered steel buildings. TRACDEK® Metal Roofing & Cladding Systems We manufacture world-class pre-engineered roofing and cladding systems designed to meet custom requirements. Our extensive portfolio includes the Hi-Rib Roofing & Cladding System, Klippon Roofing & Cladding System, and SS-2000 Standing Seam Roofing System. Each of these solutions is engineered to provide exceptional performance and durability, ensuring that we meet a wide range of needs with precision and reliability. Trac® Ceilings Our TRAC® range of metal ceilings are manufactured from fully recyclable materials and are pre- painted and prefabricated in our factory. 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