Boarders in Years 9 and 10 board in colourful and spacious dorms of four or five in the main school building. Each boarder has their own bed  and a well-equipped common room for relaxation. Study is completed downstairs in the School library to provide a sense of separation from academic life.

Year 11 boarders move into a separate wing and have single or double rooms to recognise their changing needs and greater levels of independence, preparing them for Sixth Form.

As senior pupils all Cecilia House boarders are encouraged to get involved in the life of the school. These years are important both academically and for emotional and social development – it is a time for boarders to enjoy exploring their interests; following their enthusiasms, and learning to co-operate with each other as they become more independent. Boarders and staff in Cecilia House meet regularly at house meetings and at a variety of informal occasions to communicate, co-operate and socialise.