Students at the Summer Hill campus are divided into sixteen
houses, named after significant facets of the school's history, the four original houses were Archer, Henderson, Hilliard and School. The 16 houses in Trinity Grammar School are Archer, Dulwich, Founders, Henderson, Hilliard, Holwood, Kerrigan, Latham, Murphy, School, Stephenson, Taubman, Weeks, Wilson Hogg, Wynn Jones and Young house. School House was reserved for boarders, although leading up to the closure of the boarding program in 2019 non-boarders were placed into this house to supplement the numbers. Boys are usually put into their family house, the same house as their father or grandfather or brother. Each house has a house captain and a maximum of three house vice-captains, with the majority of houses also having an unlimited number of prefects (students cannot be both a prefect and house captain). Each year the different houses compete for the House Cup in a variety of activities such as swimming, track and field, touch football, indoor soccer, chess, debating, music, academic, cricket, fitness challenge, dodgeball, tug of war, drama performances and quad challenge. Through these activities houses are awarded points, and at the completion of the calendar year the house with the most points wins the cup, presented at the final assembly. In the case of significant victories, such as winning the swimming carnival or track and field, each house gives three cheers (in quick succession, clockwise around the quadrangle) for the victorious house, with the victorious house giving three final cheers for the school. These cheers are led by the house officers (often aided by prefects), who typically deliver the three cheers with as much volume as can be mustered. Wilson Hogg House is the current house championship holder (2025), the current swimming champions are Wilson Hogg House (2025,2026) and the current track and field champion is Wilson Hogg (2025).
Senior school The senior school is divided into sixteen houses, as follows: • Archer (Red) • Dulwich (Sky Blue) • Founders (Orange) • Henderson (Gold) • Hilliard (Purple) • Holwood (Tan) • Kerrigan (Lime Green) • Latham (Black) • Murphy (Khaki) • School (Dark Blue) • Stephenson (Turquoise) • Taubman (White) • Weeks (Mid Blue) • Wilson Hogg (Platinum) • Wynn Jones (Bishop Pink) • Young (Maroon)
Junior school The Junior School is divided into four houses, as follows; • Taubman (White) • Latham (Black) • Founders (Orange) • Young (Maroon)
Preparatory school The preparatory school is divided into four houses. These houses earn points towards the house cup, which is awarded at the prize giving each year. Competitions for houses include track and field, swimming, cricket, debating, rugby and academic. Each house is assigned a housemaster, who has responsibility for the direct organization of the pupils in their house. Most teachers are assigned a house, and although they have no day-to-day tasks relating to the house, they are used to provide additional control at house events. Unlike the house system at the senior school, the preparatory school houses do not have any direct impact on the academic or co-curricular aspects of the school. The houses are: • Archer (Red) • Henderson (Gold) • Hilliard (Purple) • School (Dark Blue)
Former houses Old Junior School houses were; • Dulwich (Sky Blue) • Chambers [other name for Founders] (White) • School (Dark Blue) ==Curriculum==