[2] From 1926 to early 1928, the Old Rectory of St John the Baptist Church, Reid, was leased from the Government by the Kilburn Sisters.

In May 1927, the day before the opening of Parliament House, the foundation stone of the current site on Melbourne Avenue at Deakin, was laid by Lewis Radford, Bishop of the then Diocese of Goulburn.

[2] CCEGGS was nearly closed down during the Great Depression, and sold some of its land in order to remain solvent.

In 2004, CGGS opened an Early Learning Centre (preschool) catering for 3- to 5-year-olds on its Junior School campus.

[4] Combined, the campuses are 10 hectares (25 acres) in size, and include an indoor heated swimming centre, gymnasia, sports courts, playing fields, an aquatic centre on the shores of Lake Burley Griffin, and buildings catering for the performing arts, art and textiles.

In the senior campus a new administration block, drive through and entrance was built in 2011 and a new award-winning science wing completed in 2012.

[11] The junior school curriculum is based upon the New South Wales Department of Education Board of Studies syllabus.

[13] A high percentage of students who graduate with a Year 12 Certificate also obtain an ATAR and go on to study at university.