The remaining 32 acts made it through to the Judges' Houses. Barlow mentored the Boys, Rowland the Girls, Walsh the Over 25s, and Tulisa the Groups. Robbie Williams joined Barlow in Los Angeles, Jennifer Hudson assisted Rowland in Miami, Walsh was accompanied by Sinitta in Barcelona, and Tulisa received help from Jessie J in Mykonos. At judges' houses each act performed two songs for their mentor and his/her guest judge, although only one song was mentioned and shown on the main show, with the other song shown on The Xtra Factor instead.
Sian Phillips was originally selected for the judges' houses, but due to visa issues, she was unable to travel to Miami and was thus replaced by Sarah Watson in the Girls category.