[3] In 1982[3] it was registered as a private limited liability company, introducing London O-Level and A-Level courses to provide international education.

[4] Following negotiations, in 1991 the Institute began preparing students to receive degrees from the University of London, as a way to provide continuity of education up to tertiary level.

[6] In 2005, another branch was established in Maharagama[7] followed by starting an international girls school[8] in Colombo 6 in 2008 to accommodate the aspirations of parents who wished to educate their daughters.

[9] Royal Institute International School emphasizes holistic education, balancing academic excellence with strong sports and leadership development.

[11] The school flag[12] is rectangular in shape and has the Royal Institute logo at the centre in dark brown on a cream background.