The St. Peter's College branch school was the initiative of the auxiliary Bishop of Colombo, Oswald Gomis.

Under the patronage of Archbishop of Colombo, Nicolas Marcus Fernando, St. Peter's College, Udugampola was founded on 2 February 1993, in the Holy Cross Church premises known as "Gal Palliya".

On 25 October 2003, the Udugampola branch of St. Peter's College was opened by Gomis, with Rev.

The foundation stone was laid for a four-storey building in Udugampola in order to accommodate the students.

This new classroom building was opened on 23 April 2013 by Cardinal Ranjith and the Udugampola branch was renamed to St. Peter's College, Gampaha.