The work done by Erith and Terry in the 1960s and 1980s represent the most extensive remodelling of Number 10 in recent times . Since 1990 when the Terry reconstruction was completed , repairing , redecorating , remodelling , and updating the house has been ongoing as needed . The IRA mortar attack in February 1991 led to extensive work being done to repair the damage ( mostly to the garden and exterior walls ) and to improve security . In the summer of 1993 windows were rebuilt and in 1995 computer cables installed . In 1997 , the building was remodelled to provide extra space for the Prime Minister 's greatly increased staff . To accommodate their large families , both Tony Blair and David Cameron chose to live in the private residence above Number 11 rather than the smaller one above Number 10 . In 2010 , the Camerons completely modernised the 50-year-old private kitchen in Number 11
IRA mortar attack
Downing Street mortar attack
10 Downing Street