 Delhi Metro was planned to be built in phases spread over around 20 years as with each phase having a target of five years and end of one phase marking the beginning of another . Phase I ( 65 km ) and Phase II ( 125 km ) were completed in 2006 and 2011 , respectively , and Phase III and Phase IV are scheduled for completion in 2016 and 2021 , respectively . Work on Phase III started in 2011 while planning for Phase IV has begun . Ex @-@ chief of DMRC hinted that by the time Phase IV is completed , the city will need Phase V to cope with rising population and transport needs . 
