Taylor House – Taylor House was named in honour of the Hon. James Taylor, the first chairman of the board of trustees at the school. In the first colonial parliament, he represented the Western Downs in the Legislative Council and then later as Mayor of Toowoomba. He was well known for his contributions to the Benevolent Society and the hospital, as well as being the first president of the School of Arts and his promotion of the foundation of the Darling Downs Agriculture Society. As well as Active Development of the Clifford Park Race Way. Prior to 1992, Taylor House was the boarding house for the year-nine students at the school, and in 2004 combined with Gibson House to form a combined day/boarding house. This boarding house is the smallest of the six currently on campus with plans for a new boarding house to be situated on the Parents and Friends' Oval, and the boarding house be renovated into the new "Engineering and Vocational Training Centre". The House's colour is black.
Boyce House – Boyce House takes its name from an old boy of the school, Mr Leslie Atherton George Boyce. Mr Boyce entered the school in 1911 as a Scholar of the State. In 1915 he entered the AIF and served in France, later to be wounded in 1917 and hence awarded the Military Cross for "conspicuous gallantry and devotion to duty when in command of his platoon during an attack". On returning to Toowoomba, he became the chief executive officer of the
Toowoomba Foundry, remaining as the Director until 1976. Prior to 1992, Boyce House was home to Year 10 students and in 2004 along with the other houses was amalgamated with Henderson. The boarding house exists next to the Margaret School entrance and is planned to be renovated into the "Culture Centre" focusing on all walks of artistic excellence on campus. With a new boarding house to be constructed alongside the new Taylor Boarding House. Within the boarding house it maintains four internal dormitories, these being Woodward, Fortescue, Robertson, and Clownes in Honour of famous Old Boys who gave their lives in the Great War and World War II. The house's Colour is Maroon.
Mackintosh House – Mackintosh House is the oldest of the schools houses, and is named after the school's inaugural headmaster, Mr John Mackintosh, who was appointed as headmaster in 1876. Born in Scotland in 1836, he excelled academically at Edinburgh University before sailing to Australia in 1861. He became immortalised at the school after he was killed when he was thrown from his horse while on a riding expedition to Helidon below the range. Mackintosh House was the home to the Year 12 boys prior to 1992, and in 2004 merged with Chauvel to form its combined house. It was originally situated in the two upper floors of the school's original building. In 2011 the decision was made to move them out of this facility and renovate it to Staff Offices. As a result of this, the Mackintosh House is situated in the newest boarding house on campus. Located in between the existing Taylor and Boyce Houses. The house's colour is red.
Groom House – Groom House holds the highest prestige after being named after Sir
Littleton Groom. In 1901 Sir Littleton was elected as the first federal representative of the seat of Groom (named after him, although he held the seat of Darling Downs) and later the first speaker of the house. He then held this seat for 36 years. Sir Littleton is listed on the Old Boys' Wall of Achievement. Prior to 1992, Groom House was home to Year 8s, and was merged with Freshney in 2004. The boarding house from Groom House is currently located on the lower floor of the original Stephens House (which was originally a two-story boarding house) when the Junior School occupied its original boarding house to create Corfe House. This boarding facility is located on the Herries Street side of the campus and is in a traditional red brick construction. It is one of few boarding houses where the boarding housemaster lives in the building itself and not a separate detached building. The house's colour is green.
Stephens House – Stephens House was named after the undisputed founder of Toowoomba Grammar School Mr Samuel George Stephens. Mr Stephens was born in Wales and having been educated at the School for Captains' Sons, joined the Merchant Navy. On one of his adventures, the ship was wrecked on the Victorian Coast near Melbourne. He eventually moved to Toowoomba where he and his wife built a house in Herries Street, where he then raised six daughters. He was the honorary secretary of the first board of trustees, and his oldest son
Alfred was the first boy to be enrolled at the school. Prior to 1992, Stephens House was the home for Year 11 students, and further in 2004 was merged with the Day House Partridge to form a combined house. Located in the same boarding house as Groom House, Stephens House also has a boarding house master that lives inside the boarding house rather than a detached building. The house's colour is royal blue. == Headmasters ==