The Senior School at Pittwater House includes the Grammar School and the Girls' College. The Grammar School and College are run as separate schools on the same campus.
The Grammar School is under the leadership of Mr Mark Trollope and the College is under the leadership of Mrs Lorna Probst.
The Senior School is from Year 7 to Year 12. The Senior school follows the secondary school curriculum and offers the students a wide variety of co-curricular activities to broaden their mind, body & spirit.