St Paul's has three Houses. These are named after pioneer land owners of the area. Archer (red), Gregor (green) and Jeffreys (blue) engage in house sport at various sports carnivals held each year. Lunch time competitions are sometimes organized by the House Captains. Trophies and shields are awarded to the winning teams.
All students are appointed to a house when they enrol at St Paul's. Younger siblings are placed in the same house of their older brothers and sisters. The school's sport shirts have colour panels in them to distinguish which house a child belongs to. The collar also has the house name printed on it.
House Captains are elected from the Year 6 classes at the start of the school year. They are installed at a special ceremony held in the chapel soon after their appointment. House Captains make up part of the student leadership of the school and are required to set a good example for other students in the school.