36 Bannerman Road

Maria Jackson and, later, Rani Chandra lived on in a house at 36 Bannerman Road (previously 12 Bannerman Road) in Ealing near Sarah Jane Smith, who lived at number 13.

Behind the Scenes
Dialogue in The Last Sontaran and The Day of the Clown establishes the exact address as 36 Bannerman Road. In Invasion of the Bane and other episodes throughout the first series the address of the house is 12 Bannerman Road.