Martlet House accommodates 75 girls both day and boarding. In the lower year groups day and boarders are mixed together with no more than four boarders in a room. As the girls move up through the years they will move into triple rooms and then often a double. In the Sixth Form all girls have their study room with a bed.

The girls are allocated their room each term with the Fourth Form changing every half term. This encourages the girls to get to know as many members of the house as possible. The girls are encouraged to decorate their bed areas with pictures, unique duvet covers and tapestries to help make the room their own.

In addition to the bedrooms, the girls have access to a kitchen area that is within the matron’s office to make drinks and snacks; a large central common room for socialising and TV. There are also computers, tables for working and also games tables. The Sixth Form girls have their own additional kitchen and their own laundry room equipped with washing machines and tumble driers.

Martlet House opened for the start of the Michaelmas term in September 2019 with 60 girls. The house was created by converting old classrooms and taking the top floor from South House. Martlet shares an entrance and stairwell with South House and a Sixth Form common room on the lower ground floor.

Martlet House is situated in the Connaught Block and has a modern and light feel, with new furniture throughout and large windows. The house shares a small fenced garden with South but also uses South Field as its main area for entertaining.