 When the first section of the Jubilee line was planned in the 1970s , the second phase of the project was intended to continue the line eastwards from the terminus at Charing Cross to the City of London , Woolwich and Thamesmead . Westminster station would not have been on this planned route , but the need to provide transport infrastructure for the redevelopment of the London Docklands in east and south @-@ east London led to a redirection of the route to run via Westminster to connect Waterloo and London Bridge stations with the new developments . For the Jubilee Line Extension , the buildings around the station were demolished and the sub @-@ surface station was completely reconstructed together with the erection of a parliamentary office building , Portcullis House , which sits above the station . Both projects were designed by Michael Hopkins & Partners . 
