Submission of Report of Monitoring Agency Report for the quarter ended September 30, 2026

Date: 11th 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 – 400051 Mumbai- 400001 NSE Scrip Symbol: INTERARCH BSE Scrip Code 544232 Subject: Submission of Report of Monitoring Agency Report for the quarter ended September 30, 2026 - in relation to the Initial Public Offer (“IPO”) of Interarch Building Solutions Limited (“the Company”) Dear Sir/Madam, Pursuant to Regulation 32(6) of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, we have attached herewith the Report of Monitoring Agency i.e. CRISIL Ratings Limited for the quarter ended September 30, 2026. You are requested to take note of the same. Thanking You, For Interarch Building Solutions Limited (formerly known as Interarch Building Products Limited) NIDHI KHANDELWAL COMPANY SECRETARY & COMPLIANCE OFFICER M.No.: A19279 Encl. As stated above 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. Monitoring Agency Report Interarch Building Solutions Limited (previously known as Interarch Building Products Limited) for the quarter ended September 30, 2026 CRL/MAR/IABPPL/2026-27/2006 November 05, 2026 Interarch Building Solutions Limited Farm No.-8, Khasara No. 56/23/2 Dera Mandi Road, Mandi Village, Tehsil Mehrauli, New Delhi, Delhi-110047 Dear Sir, Monitoring Agency Report for the quarter ended September 30, 2026 - in relation to the Initial Public Offer (“IPO”) of Interarch Building Solutions Limited (“the Company”) Pursuant to Regulation 41(2) of SEBI (Issue of Capital and Disclosure Requirements) Regulations, 2018 (“SEBI ICDR Regulations”) and Monitoring Agency Agreement dated August 10, 2024, enclosed herewith the Monitoring Agency Report, issued by Crisil Ratings Limited, Monitoring Agency, as per Schedule XI of the SEBI ICDR Regulations towards utilization of proceeds of IPO for the quarter ended September 30, 2026. Request you to kindly take the same on records. Thanking you, For and on behalf of Crisil Ratings Limited Shounak Chakravarty Director, Ratings (LCG) Report of the Monitoring Agency (MA) Name of the issuer: Interarch Building Solutions Limited For quarter ended: September 30, 2026 Name of the Monitoring Agency: Crisil Ratings Limited (a) Deviation from the objects: Deviation is observed in the utilization of funds against the objects stated in the Prospectus however, utilization is in line with change of objects as per the Shareholder’s approval. This approval was obtained for reallocation of proceeds of Rs 105.33 million from Object 1, Object 2 and Object 3 of the offer to a new object - “Civil and PEB in Gujarat” (b) Range of Deviation: Upto 10% Declaration: We declare that this report provides an objective view of the utilization of the issue proceeds in relation to the objects of the issue based on the information provided by the Issuer and information obtained from sources believed by it to be accurate and reliable. The MA does not perform an audit and undertakes no independent verification of any information/ certifications/ statements it receives. This Report is not intended to create any legally binding obligations on the MA which accepts no responsibility, whatsoever, for loss or damage from the use of the said information. The views and opinions expressed herein do not constitute the opinion of MA to deal in any security of the Issuer in any manner whatsoever. Nothing mentioned in this report is intended to or should be construed as creating a fiduciary relationship between the MA and any issuer or between the agency and any user of this report. The MA and its affiliates also do not act as an expert as defined under Section 2(38) of the Companies Act, 2013. The MA or its affiliates may have credit rating or other commercial transactions with the entity to which the report pertains and may receive separate compensation for its ratings and certain credit-related analyses. We confirm that we do not perceive any conflict of interest in such relationship/interest while monitoring and reporting the utilization of the issue proceeds by the issuer. We have submitted the report herewith in line with the format prescribed by SEBI, capturing our comments, where applicable. There are certain sections of the report under the title “Comments of the Board of Directors”, that shall be captured by the Issuer’s Management / Audit Committee of the Board of Directors subsequent to the MA submitting their report to the issuer and before dissemination of the report through stock exchanges. These sections have not been reviewed by the MA, and the MA takes no responsibility for such comments of the issuer’s Management/Board. Signature: Name and designation of the Authorized Signatory: Shounak Chakravarty Designation of Authorized person/Signing Authority: Director, Ratings (LCG) 1) Issuer Details: Name of the issuer: Interarch Building Solutions Limited Names of the promoter: a. Mr Arvind Nanda b. Mr Gautam Suri Industry/sector to which it belongs: Capital Goods (PEB) 2) Issue Details Issue Period: Monday, August 19, 2024, to Wednesday, August 21, 2024 Type of issue (public/rights): Initial Public Offer (IPO) Type of specified securities: Equity Shares IPO Grading, if any: NA Issue size: Fresh issuance of Rs 2,000.00 million (Refer Note) Note: Particulars Amount (Rs in million) Gross proceeds from the Fresh Issue 2,000.00* Less: Issue Expenses 119.02 (Refer Note 7 on page number 9 of the MA Report for revision) Net Proceeds 1,880.98 *Crisil Ratings shall be monitoring the gross proceeds. 3) Details of the arrangement made to ensure the monitoring of issue proceeds: Source of information/ Comments of certifications Comments of Particulars Reply considered by the Board of Monitoring Monitoring Agency for Directors Agency preparation of report Peer-reviewed independent chartered Proceeds accountant certificate^, utilized Management towards Whether all utilization is as per undertaking, financing IT the disclosures in the Offer No Prospectus dated assets and No comments Document? August 21, 2024 Civil and PEB (“hereinafter referred to (Refer Note 1, as Offer Document), Note 2 and Note Postal Ballot Notice, 3) Bank Statements Source of information/ Comments of certifications Comments of Particulars Reply considered by the Board of Monitoring Monitoring Agency for Directors Agency preparation of report Peer-reviewed Whether shareholder approval independent chartered has been obtained in case of (Refer Note 1, accountant certificate^, material deviations from Yes Note 2, Note 3 No comments Management expenditures disclosed in the and Note 4) Undertaking, Postal Offer Document? Ballot Notice Whether the means of finance for the disclosed objects of the issue No No comments No comments has changed? Is there any major deviation observed over the earlier No No comments No comments monitoring agency reports? Whether all Government/statutory NA No comments No comments approvals related to the object(s) have been obtained? Peer-reviewed Whether all arrangements independent chartered pertaining to technical NA accountant certificate^, No comments No comments assistance/collaboration are in Management operation? Undertaking Are there any favorable events improving the viability of these No No comments No comments object(s)? Are there any unfavorable events affecting the viability of the No No comments No comments object(s)? Is there any other relevant information that may materially No No comments No comments affect the decision making of the investors? NA represents Not Applicable ^Certificate dated October 15, 2026, issued by M/s Vishal Maheshwari & Co., Peer-reviewed [Showing first 8,000 characters — download PDF for full document]