The Government of Maharashtra issued a gazette notification on the proposed Navi Mumbai Metro project on 28 April 2010, requesting comments from the public.

[2][3] The City and Industrial Development Corporation (CIDCO) was named as the implementing agency for the proposed Belapur–Pendhar–Kalamboli–Khandeshwar line, under the Indian Tramway Act 1886, by the Government of Maharashtra on 30 September 2010.

[6] CIDCO appointed the Louis Berger Group and Balaji Rail Road Systems as general consultants for the project.

The third phase will entail the merging of two rail corridors between Pendhar and MIDC with a 2.2-kilometre (1.4 mi) link, forming a loop from Belapur to Khandeshwar.

[14][15] J Kumar Infraprojects Ltd was awarded a ₹132 crore (US$15 million) contract to design and build the depot at Taloja in February 2013.

Finding the progress of work to be unsatisfactory, CIDCO sent a notice terminating the contract to the San José-Mahavira-Supreme consortium on 11 January 2017.

The official also stated that a metro train had been run on the 3 km (1.9 mi) section of track connecting Pendhar station with the depot at Taloja.

[22] Prakash Constrowell was unable to carry out any work for several months due to the pending court case filed by the previous contractors.

[26] It also announced that it had appointed Maharashtra Metro Rail Corporation Limited (Mahametro) to complete the work on Phase I at a cost of ₹850 crore (US$98 million).

[29] The Research Design and Standards Organisation (RDSO) began oscillation and emergency breaking distance trials on 28 August.

[32] In the same month, the Commissioner of Metro Railway Safety (CMRS) required the replacement of the bearings on most of the pillars on the stretch between Belapur and Kharghar.

[36] Mahametro completed a successful trial run on the 5.96 km (3.70 mi) section between Central Park and Belapur on 30 December 2022.

[42] Stage 3 involves the construction of a 2 km link and one station between Pendhar and MIDC, to join Stage 1 and Stage 2, and also the construction of a 5 km link to connect the upcoming Navi Mumbai International Airport from Khandeshwar, from where the Navi Mumbai International Airport Metro Station will be connected with the proposed Line 8 (Gold Line) of Mumbai Metro till Chhatrapati Shivaji Maharaj International Airport.

An international consortium of companies including Ansaldo STS, Tata Projects and CSR Zhuzhou was awarded a EUR 78 million contract to supply the electrical and mechanical systems for Phase I in July 2014.