13 Bannerman Road 13 Bannerman Road or according to some accounts number 21 ( TV : " Eye of the Gorgon " , " Whatever Happened to Sarah Jane ? " , " The Lost Boy " ) was the address of a house in the London suburb of Ealing . In the early 21st century , it was the home of Sarah Jane Smith and her adopted children Luke and later Sky . It was later the home of Rani Chandra . Before Sarah Jane owned the house , it had belonged to her aunt Lavinia Smith , who left it to her . Features . There were many bookcases in the house . Among the books were : The attic . The attic was the largest room in the house , and served as Sarah Jane ' s home office and base of operations . Several photographs hung there ; among them were portraits of Alistair Gordon Lethbridge - Stewart , Harry Sullivan and K9 Mark III and herself ; along with these were old drawings of the Doctor ' s TARDIS . ( TV : " Invasion of the Bane " ) The attic also contained a telescope and a chair for stargazing . ( TV : " The Last Sontaran " ) In the attic there were a lot of alien objects , that Sarah Jane got during her adventures . Some of them were gifts , others Sarah Jane kept safe from aliens who wanted to use them to take over Earth . On the desk Sarah Jane kept all her important documents . Luke Smith , Rani Chandra and Clyde Langer also had their own desk on the attic . Clyde made a lot of drawings on his desk . Luke used his desk for his science projects and Rani made researches on her desk . ( WC : " " ) After K9 Mark III broke down and Sarah Jane was unable to repair his future technology , she stored him to a cardboard box in the attic . ( TV : " School Reunion " ; PROSE : " Moving On " ) He was repaired when Sarah Jane found the Tenth Doctor , but promptly sacrificed himself in the line of duty . ( TV : " School Reunion " ) When Sarah Jane discovered that the Xylok crystal she had been given by a geologist friend could communicate with her laptop , she followed its plans to build for it a supercomputer in the attic wall , into which the Xylok was integrated . The resulting sentient computer took the name Mr Smith and provided her with access to countless databases , communications systems , and functioned as a research laboratory . ( TV : " The Lost Boy " , " Invasion of the Bane " ) K9 Mark III ' s successor , K9 Mark IV , was forced to leave Sarah Jane soon after his arrival , in order to stabilise an artificial black hole in Switzerland . A space - time link in a safe in the attic allowed periodic contact between K9 and his mistress ( TV : " Invasion of the Bane " ) and brief teleportation of K9 back to the attic in emergencies . ( TV : " From Raxacoricofallapatorius With Love " , " Journey ' s End " , " The Lost Boy " , " The Mad Woman in the Attic " ) After K9 ' s mission was complete , the safe became a storage unit for any alien weapon Sarah Jane had acquired . ( TV : " The Mad Woman in the Attic , Goodbye , Sarah Jane Smith " ) Up until September 2010 , there was a pillar in the middle of the space . After this time , the top had been removed and it had become a stand on which alien objects could be placed for Mr Smith to scan . ( TV : " The Nightmare Man " ) After occupation of the house passed to Rani Chandra sometime before 2050 , Rani made her home office on the same portion of the attic as Sarah Jane had done . ( TV : " The Mad Woman in the Attic " ) History . 13 Bannerman Road was the home of Sarah Jane Smith . With K9 Mark IV gone to control a black hole , she was alone but for her Xylok sentient supercomputer , Mr Smith . On the night after moving in across the road , Maria Jackson saw Sarah Jane communing with the Star Poet in the garden of the house . Days later , Sarah Jane and Maria rescued an artificially grown " teenager " from the Bane ; she adopted the boy and named him Luke Smith . The house suffered minor damage after Davey , a member of the Bane family , was sent to kill Sarah Jane . The front door was ripped off its hinges and a couple of banisters damaged . Soon after , 13 Bannerman Road became home to Luke Smith . ( TV : " Invasion of the Bane " ) 13 Bannerman Road served as headquarters from where Sarah Jane , Luke , Clyde and Maria would hunt aliens . There , Alan Jackson was turned to stone by a Gorgon . ( TV : " Eye of the Gorgon " ) The attic served as one of the nodes of the Sub - Wave Network used to guide the Tenth Doctor to Earth after the Dalek s had re - located the planet to the Medusa Cascade . ( TV : " The Stolen Earth " ) After Maria left for America , the group met Rani Chandra , who soon found out about Sarah Jane and what she did . ( TV : " The Day of the Clown " ) Luke Smith and K9 left for the University of Oxford , " circa " September 2010 . ( TV : " The Nightmare Man " ) In the following spring or summer , an infant was left on the doorstep . The child , an extraterrestrial humanoid , almost immediately aged into a 12 year old . Sarah Jane later adopted her and named the girl Sky Smith . ( TV : " Sky " ) Sarah Jane continued to use her house at 13 Bannerman Road for several decades until she finally retire d from defending the Earth and moved away to live peacefully , entrusting the house to an older Rani , who was now married and had grandchildren . ( TV : " The Mad Woman in the Attic " ) Other information . Harriet Jones knew that Sarah Jane Smith lived there . ( TV : " The Stolen Earth " ) Sarah Jane put a key under a flowerpot at the side of the house to allow for emergency entry . ( TV : " The Last Sontaran " ) Chrissie Jackson found her way into the house twice through the same window and commented that " some people never learn . " ( TV : " Eye of the Gorgon " , " The Last Sontaran " )