The school was established in 1910 on the initiative of
Bishop Julius of the
Anglican Diocese of Christchurch, who invited the
Kilburn, England-based
Sisters of the Church Order to set up the school. The school was initially located in the
Christchurch Central City south of Armagh Street, where it opened on 8 February 1910. In 1914, the school moved slightly north to Chester Street West off
Cranmer Square, and that building is now part of the
Cathedral Grammar School. St Margaret's opened a prep school on Papanui Road in the early 1920s, just north of the current school grounds. In the 1940s, the current grounds were occupied. In the
2011 Christchurch earthquake, Kilburn House was damaged. After NZ$2 million repairs, Kilburn House opened again in August 2012. The school received a commendation from the Christchurch Civic Trust for the renovation of this heritage building. This renovation was part of a significant rebuild project following the earthquakes when the school lost close to 90% of its buildings. ==St Margaret's College today==