[4][5] Construction will be completed over five phases, and the transit system would be owned and operated by the state-run Patna Metro Rail Corporation.

In November 2011, Union Urban development minister Kamal Nath said that all cities with a population of more than two million people would get a metro corridor.

[16] The Bihar urban development department is the nodal agency for Patna Integrated Mass Rapid Transport System (PIMRTS).

[19][20][21] Metro rail was found more viable option for the city than monorail due to the load factor.

[22] On 11 June 2013, the Bihar cabinet approved the proposal to prepare a Detailed Project Report (DPR) for a metro service in Patna.

The changes led to the creation of a second interchange at Khemni Chowk, the elimination of Line-1's depot at Aitwarpur and the addition of two new stations at Ramkrishna Nagar and Jaganpura.

An agreement was signed between Patna Metro and Japan International Cooperation Agency for a loan of ₹5,520.93 crore (US$640 million), which was 60% of the cost of the project.

In July 2021, PMRC organized a competition to design the logo of Patna Metro, inviting the public to take part, with prizes for the best submissions.

[41] YFC Projects, a construction company based in Gurgaon, India, won the contract to build the 8 km (4.97 mi) elevated section of Corridor 1.

The majority of the stretch on Corridor I is underground due to Rupaspur railway overbridge (RoB) and Jagdeopath-Sheikhpura Mor flyover.

308 U-girders are constructed in the priority corridor comprising five metro stations: Malahi Pakri, Khemnichak, Bhootnath, Zero Mile and Patliputra Bus Terminal.

[45] The rest of the 7.94 km (4.93 mi) section of Corridor 2 will be underground; a ramp is to be constructed before the Rajendra Nagar metro station.

Patna Metro will only have one depot, built at SH-1, Bairiya Chak in Sampatchak at Paijawa, near the Patliputra Bus Terminal.

[51] Of this land, 47.4 acres (19.2 ha) are proposed for metro rail depot; the remaining areas are for property development.