In 1886 or somewhat later, Julius Caesar Czarnikow bought Effingham Hill House from Frederick Augustus Maxse, and owned it until he died in 1909.

Through an extensive programme of professional development for staff, teachers are fully informed of cutting edge methodologies for full engagement and interaction.

St Teresa's has 48 acres (0.19 km2) of grounds in a designated area of outstanding natural beauty amid the Surrey Hills AONB, in a multi-crested section of the escarpment of the North Downs.

Entry to St. Teresa's is selective, and is based on an entrance examination with papers in English, Maths, Science and Verbal Reasoning.

The Trust plans to expand Cranmore into providing secondary education on its present site, with the two schools having a combined sixth form located at St Teresa's, from September 2025.