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.
For forlængelsen af Jubilee line blev bygninger nær stationen revet ned og afgravningsstationen blev fuldstændig ombygget sammen med byggeriet af en parlamentarisk kontorbygning, Portcullis House, ovenpå stationen.