Perth Modern School has a House tradition that dates back to the second principal of the school, Mr Joseph Parsons. When the school returned to its academic focus in 2008, the House System was revived. The four Houses are named after the first principals of Perth Modern School. Every student is assigned to a House through their Advocacy group, and they remain in that House for the duration of their time at the school.
Brown House – Mr F. Brown (Principal: 1911–1912) – Advocacy A & B
Downing House – Mr Downing (Principal: 1912–1939) – Advocacy C & D
Parsons House – Mr J. Parsons (Principal: 1940–1963) – Advocacy E & F
Sampson House – Mr Sampson (Principal: 1964–1965) – Advocacy G & H