In order to inculcate a healthy spirit of competition and to get the best of each individual students, Karthika High School students are divided into Four Houses. The divisions of the Houses are as follows:
Gandhi House
Patron: Mohandas Karamchand Gandhi
Colour: Green
Radhakrishnan House
Patron: Dr. S. Radhakrishnan
Colour: Yellow
Shivaji House
Patron: Chhatrapati Shivaji
Colour: Red
Tagore House
Patron: Rabindranath Tagore
Colour: Blue