Being founded in late 1961 and opening in the Thomas Vickers Church Hall in
Curl Curl in February of 1962, the school's enrolment numbers grew rapidly, with land being purchased in
Collaroy by 1964 to house a new Prep School building. In 1968, the first secondary Grammar school students started, and
Mr Morgan gave ownership of the school to a non-profit company which owns and administers the school to this day. The school was registered and accredited by the NSW Board of Studies to offer the
HSC and registered with the Commonwealth Government to receive per capita non-government school grants. The Country Life Scheme was created in 1970, entailing annual visits by class groups to the historic Abercrombie House in Bathurst. This program led to the foundation of the School's Cadet Unit in 1972; the first co-ed Cadet Unit in Australia following the opening of the secondary Girls College in 1975. The Junior Girls College opened in 1977, at which point sectional headmasters were appointed as administrators of the four schools that made up Pittwater House. In 1984, the 1000-seat capacity Great Hall was completed. Construction of the School's Short Course Olympic Swimming Pool began in 1994, and in 2005 the School opened a purpose built, DOCs compliant, Early Childhood Centre to assist with the demand for pre-school places on the
Northern Beaches. In 2009, the school received Australian Government Stimulus Funding grants including a $1.7 million grant for the construction of the indoor sports stadium, which was built in 2010. ==Notable alumni==