In January 2011, Larsen and Toubro was awarded the contract for elevated viaducts for . In March 2011, Chennai Metro reached an agreement with the Government of Japan for a loan of for the second phase. In June, tenders for the elevated stations of the first phase were awarded to Consolidated Construction Consortium Limited. In August 2010, the contract for supplying rolling stock was awarded to Alstom at a cost of . It was announced that the first phase would be extended by and Larsen and Toubro was awarded a contract to construct a depot at Koyambedu. In December 2010, DMRC submitted a report for extending Corridor-I from Washemenpet to Wimco Nagar, a distance of at an estimated cost of .