The foundation stone was laid at the marble West Door by Princess Helena of Waldeck and Pyrmont on 8 June 1905 and the chapel was consecrated on 27 October 1906. The building's design is Gothic, to complement the surrounding buildings. All visible woodwork is in oak. The roof comprises elaborately worked tussels and tracery work, somewhat after the lines of the famous roof of Westminster Hall. The floor is of alternating black and white marble. The chapel was designed to seat 350 boys, with the west balcony reserved for household staff.