In 1975 Ashdown House became a charitable Trust with a board of governors and shortly thereafter the decision was taken to welcome the first girls. 

Over the following 30 years a programme of modernisation and extension was undertaken:  the outdoor pool was replaced by a superb indoor version, the dining room and kitchen moved to a purpose built building, the Theatre and Music block, and the East Wing were built to accommodate the growing numbers.  At the turn of the millennium the Jungle Block was constructed and this now houses our junior children and three superb Science labs.

In 2009 Ashdown merged with the Cothill Educational Trust providing new opportunities such as regular visits to The Chateau de Sauveterre in southern France and The Old Malthouse, a wonderful geography and science field study centre.