Bengaluru Metro Phase 3A: Cost Cut, Timeline Pushed

Bengaluru's most-awaited cross-city metro corridor has cleared a major hurdle, but not without a cost. The 37.8-km Phase 3A linking Hebbal and Sarjapur Road is now expected to open in 2033 after cost optimisation, alignment changes and station revisions reduced the project cost to Rs 25,999 crore. For homebuyers who have been tracking this corridor since it was first announced, the update brings welcome cost clarity but pushes the completion timeline further out than anyone anticipated.

The numbers tell their own story. The redesign has reduced the estimated cost from Rs 28,405 crore to Rs 25,999 crore, though even after the reduction, Phase 3A remains the most expensive Metro line planned in Bengaluru, with an estimated cost of Rs 706.49 crore per kilometre. This underscores just how complex the underground stretch through the Central Business District has proven to be, even after multiple rounds of value engineering.

The project's journey to this point has been anything but smooth. The original DPR was submitted in June 2024 and approved by the Karnataka Cabinet in December the same year. However, the Union government asked Bangalore Metro Rail Corporation Limited (BMRCL) to review the project and reduce its overall cost before granting final approval. That directive set off a nearly year-long process of technical review and redesign.

To address the Centre's concerns, BMRCL brought in outside expertise. Following a review by international consultancy Systra, BMRCL prepared a revised DPR in February 2026 and submitted it to the Centre in April. Approval is expected around October this year. The Systra review focused heavily on the underground sections, which typically cost several times more per kilometre than elevated viaducts.

The redesign brought several structural changes to the project. Key changes include a reduction in cost from ₹28,405 crore to ₹25,999 crore, a slight increase in length, trimming of the underground stretch, removal of the Veterinary College station and a revised completion deadline of April 2033—two years later than initially planned. Even with one station dropped, the corridor retains its role as a critical north-south spine through the city's core.

Once approvals are in place, ground work is expected to move quickly. The updated DPR was resubmitted in April, with approval expected by October. Construction is now targeted to begin by May 2027. That leaves roughly six years for tunnelling, elevated construction and systems work before the 2033 target.

Beyond the cost and timeline, the Red Line's real value lies in what it connects. The Red Line will connect Hebbal in the north to Sarjapur in the southeast, integrating major interchanges - the Blue Line at Hebbal, Purple Line at KR Circle, Pink Line at Dairy Circle, and another Blue Line link at Agar. This multi-line interchange design means the corridor will function less like a single line and more like a connective spine tying together Bengaluru's entire metro network.

For homebuyers, the corridor's significance goes well beyond commute times. Once completed, the Red Line is expected to be one of Bengaluru's busiest corridors, connecting Sarjapur's IT hub with HSR Layout, Koramangala, the central business district and Hebbal. Localities along this stretch, from Sarjapur and Carmelaram in the southeast to Hebbal in the north, are likely to see sustained interest from both end-users and investors as construction milestones are met over the coming years, even though the 2033 horizon means this remains a long-term connectivity play rather than an immediate catalyst.