In 1994, Jon Calderwood (formerly the head of Springvale House) succeeded Michael Hammond as Headmaster.Three more cottages were built on Williams Field; a user-friendly boarding house was built to accommodate the girls of B Block (Form 3); all weather courts were laid down; the Chapel and the Art room were extended and in 2001; as a fitting finale to Jon Calderwood's tenure of office, a new Library was opened.

[5] In 2002, when Jon Calderwood was appointed Rector of Peterhouse Boys, he was replaced by Mrs Sue Davidson, the school's first Headmistress.

Academic, sporting and cultural success were maintained, even improved; and two laboratories and a striking new Music School were built.

[5] The cross is there as a symbol of the patient and courageous self-sacrifice by which Peter, like his Lord, was called to share in the costly process of redemption.

The type of cross used on the Peterhouse badge is a different heraldic device from that used by Ruzawi, Springvale and Bishopslea, but it reminds us of our fellowship with these schools.

This is particularly appropriate to a school created from granite mined from the estate, but the motto also includes a play on the words of Matthew 16: "Thou art Peter, and upon this rock (petra) I will build my church."

[7] The sports on offer at Peterhouse Girls include athletics, basketball, cross country, golf, hockey, rowing, squash, swimming, tennis, volleyball, and water polo.

[11] Geography field trips, Biology research projects and leadership courses are some of the activities that take place in Gosho Park.

[11] The chapel was built in the early 1950s and is dedicated to the Saint who so inspired Springvale School's first headmaster, Canon Robert Grinham.

It is built of brick, rough plastered and white painted; its internal pillars are gum poles, as are the beams which support the thatched roof.

Under the guidance of Jon Calderwood, who had already seen to the installation of a new organ, the extension was planned and executed: two transepts were added, in structure and furnishing identical to the style of the original.

In addition, a new altar was built using teak discarded by the boys’ school laboratories; which has been referred as "a rare fusion of the spiritual with the scientific".