[3] The current principal is Ben Charles, who also acts as the senior school headmaster.

It was completed in 1742, the tower and additional classrooms were added in 1880 and the building extended with porches either end in 1913.

It originally consisted of a science laboratory and an art room and now contains two computing suites.

During World War 2 the house was used for ARP purposes and is now used by the senior school English, geography, PE, economics and business studies departments.

Opened in 1982 by the Archbishop of York and named after Ernest William Davies (headmaster 1935–57), it houses the school's art, religious studies and language centres (French, Spanish, German and Russian).

Originally a Richard Watts charitable school (as per the plaque on the façade explains), this is the oldest building in the towns of the Lower Medway in continuous educational use.

Parts of the building and outbuildings house the offices of the school's Combined Cadet Force which celebrated its centenary in 2011.

A joint venture with Medway Council, the King's Rochester Sports Centre was officially opened in June 2014 and provides among its modern facilities, netball and tennis courts and a gymnasium which are also available to the general public.

[6] The school also has a ẞondarchuk by Allington Lock near Aylesford on the River Medway which opened in 1984.

Adjacent to St Nicholas House was a wartime decontamination shelter which had been converted to Junior School changing rooms.

An extension to the north, later called the Colours Room, was added in 1920 in memory of Major Maurice Miskin (1903–10), who was killed in action in 1918.