The Headmaster’s Lodge, along with the main school building containing classrooms, six dormitories, a small library, quarters for five masters, Chapel of the Holy Trinity, a hospital and quarters for the Sergeant and Matron were erected by Major Innes RE, on a plan furnished by Crawford Campbell Esq, CE. They were built in 1866 in the Gothic style at a cost of Rs.1,74,954.30, less cost of the Chapel and leveling of the “first” and “second” flats.

The first Headmaster Rev. Samuel Slater, who so successfully started and established the school, was the first resident of the lodge. 

Customarily, all Headmasters have used the ground floor. The first floor was initially used for “parlour boarders"  and at one time the junior library, and Old Cottonians rooms. Currently, the computer room, conference hall and two guest rooms are located on the first floor.