The school has offered the International Baccalaureate since September 2008 and re-introduced A levels in 2013, meaning both are now available at Sixth Form.

Dalewood House, the main school building, was constructed in 1883 by a local developer called Charles J.

The interior is full of hand-painted tiles, crafted stained-glass windows, and wood panelling, with fireplaces throughout.

Having decided to leave Gordonstoun and set up his own school, he contacted a number of friends and between them they bought the Dalewood House Estate for £6,000.

[5] Between 1962 and 1963, McComish and Winthrop Young listed all the schools that they considered to have adopted Hahn's ideas or had included them in their foundation.

Gordonstoun, Salem, Anavryta and Box Hill were 'taken for granted' as the already established and preeminent Hahnian schools.

[5] On 5 June 1966, Kurt Hahn's 80th birthday was celebrated at Schule Schloss Salem, and the headmaster Prince Max of Baden invited Roy McComish as the headmaster of Box Hill School as well as the headmasters of Gordonstoun, Louisenlund, Anavryta, Battisborough, the Athenian School and the Atlantic college to discuss the establishment of a Hahn schools conference.

The six schools that attended this first conference and were the founding members of the Round Square were Box Hill, Gordonstoun, Anavryta Experimental Lyceum, Schule Schloss Salem, Aiglon College and Abbotsholme School.