NA Construction Pvt. Ltd. has received a Letter of Acceptance (LoA) from the Mumbai Metropolitan Region Development Authority (MMRDA) for the implementation of Multimodal Integration Facilities at multiple stations on Mumbai Metro Line 4 and its extension, Line 4A.

Mumbai Metro Line 4, currently under construction, spans 32.32 km from Wadala to Kasarvadavali, encompassing 30 stations. Line 4A is a 2.7 km-long extension connecting Kasarvadavali to Gaimukh with two additional stations.

MMRDA had invited bids for the project in 2024 with a 540-day completion deadline. Three firms submitted technical bids on 28 August 2024, of which two were rejected during evaluation on 31 December 2024. The financial bids were opened on the same day, with NA Construction emerging as the lowest bidder following evaluation on 3 September 2025. The LoA was formally issued to NA Construction on 3 September 2025.