There are two main boarding residences at the College which has places for 125 boarding students. Senior boarders, Years 12 and 13, are in Katharine Buchan House. The Bishopscourt Junior Boarding House is for Years 7 to 11 students. It is an imposing, three-storey historic building registered as Grade 1 by the New Zealand Historic Places Trust.
The boarding residences are open throughout the school year except over Christmas and during the two-week July school holidays. This means that International boarders may remain in residence in the April and September/October school holidays.
The Director of Boarding, Mrs Philippa Wright, has her main office in Bishopscourt.