The House System at Tranby is designed to become an increasingly important part of the pastoral care of students as they move through the school. It is also an important focus for the co-curricular programme.

When a student arrives at Tranby, he or she is put into one of four Houses and they remain in that House for all of their time at the school. Brothers and sisters are in the same House.

During 1999 the Houses were given names taken from the Noongar language to represent each of the four elements that are important in Aboriginal Culture.