Phase-3 of the Bengaluru Metro includes two elevated stretches. The first, spanning 32.15 km, will connect JP Nagar Fourth Phase on the Western side of Outer Ring Road. The second stretch, measuring 12.5 km, will link Hosahalli and Kadabagere via Magadi Road. The extension will feature 31 new stations, enhancing connectivity across the city.

The state government approved the revised project cost of Rs 156.11 billion on March 14, 2024, and announced a completion target by 2028. Unlike previous projects, the state has decided to bear 80% of the cost. Initially approved on November 18, 2022, at Rs 163.28 billion with a 20% state share, the project cost was reduced to Rs 16.41 million in a revised report submitted by June-end 2023. Further reductions led to the final proposal cost of Rs 156.11 billion.

The Detailed Project Report faced several revisions and clarifications between state and Union governments before receiving PIB approval. The Lok Sabha elections and subsequent model code of conduct had previously delayed the approval process.

The Phase-3 lines are expected to serve a daily average of 9.12 lakh passengers by 2051. The PIB, under the finance ministry, is a nodal body that evaluates the feasibility of investment plans proposed by various central ministries.