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:
Karthika High School is a community of learners and the House system aims to reflect these core values.
The House system aims to give students an identity and sense of pride in a supportive, secure environment. The Houses provide for positive competition and a closer rapport between students and teachers. They also aim to help new staff and students adapt to the culture of Karthika High School. At Karthika High School the advantages of the house system have been manifold. The houses provide not only an increased feeling of identity and belonging, they also provide students with a sense of tradition and abundant leadership opportunities.
The Houses compete in a number of sporting, academic and cultural activities for points. The House system is an integral and vibrant part of the school's culture.