Corporate Action - Book Closure from September 17, 2026 to September 23, 2026 (both days inclusive)

Date: 21st August, 2026 Listing Compliance Department BSE Limited The National Stock Exchange of India Ltd. Phiroze Jeejeebhoy Tower, Exchange Plaza, Plot No. C/1, G Block, Bandra Kurla Dalal Street, Complex, Bandra (E), Mumbai – 400001 Mumbai – 400051 Scrip Code: 544198 Symbol: DEEDEV SUB: INTIMATION OF BOOK CLOSURE DATE Dear Sir/ Madam, Pursuant to regulation 42 of SEBI (Listing Obligations and Disclosure Requirements) Regulations 2015 and section 91 of the Companies Act 2013, Register of Members and Share Transfer Book of the Company will remain closed from Thursday, September 17, 2026 to Wednesday, September 23, 2026 (both days inclusive) for the purpose of the Annual General Meeting. You are requested to take the same on your records. Yours faithfully, For DEE Development Engineers Limited Ranjan Kumar Sarangi Company Secretary and Compliance Officer Membership No.: F8604 Address: Unit 1, Prithla - Tatarpur Road, Village Tatarpur Dist. Palwal, Faridabad, Haryana – 121 102 DEE DEVELOPMENT ENGINEERS LIMITED Regd. Office: Unit 1, Prithla-Tatarpur Road, Village Tatarpur, Dist. Palwal, Haryana- 121102, India Works: Unit 1, 2 & 3, Village Tatarpur, Dist. Palwal, Haryana- 121102, India T: +91 1275 248200, F: +91 1275 248314, E: info@deepiping.com, W: www.deepiping.com CIN: L74140HR1988PLC030225 GST Registration No. 06AACCD0207H1ZA