At the beginning of the 20th century Gampaha was not yet urbanized and there wasn’t a girls’ school except an English school for boys. Therefore, the Roman Catholic Church started Holy Cross School to educate the young girls in Gampaha, with just 7 students, on 10th March 1924. The first school building was attached to the Holy Cross Church, Gampaha. The first Principal was Ms. Amelia Francis Perera and the staff consisted of a lay teacher There were seven students (6 girls and one boy).

Fr. James Dominic Ponweera O.M.I., Parish Priest of Weliweriya took the initiative to build a separate building for the school apart from the church buildings.

The school was registered and the first school day was celebrated on the 14th of September 1928.

Apostolic Carmelite sisters, Sr. Carmeline, Sr. Lutgard, and Sr. Melanie joined the Holy Cross staff.

Ms. Francis Perera handed over the school with its 200 students to the Apostolic Carmel nuns. During the Second World War, there was a considerable migration from Colombo to Gampaha. As a result, the number of students were increased and thus upper school was shifted to Bandiyamulla, the present existing premises of the school. Rev. Fr. Elias Weerakkody and Mr. Victor Danapala, worked hard to get the old Samarakkody ancestral house and the land for the school and there were temporary sheds at this initial stages, as school class rooms.

Fatima Hall was built and completed.

Loretto Hall was built and completed.

The school became an unaided private school and an accepted Catholic senior private school.

After the School Take Over Act in 1961, Mother Euphemia, then Principal, was able to secure the school as a private school under the Apostolic Carmel administration, and today HCC functions as a Government-aided Catholic private school.

Child Jesus Hall (The present Veronica Hall) was built and completed.

Little Flower Hall and a new Section of Fatima Hall were built and completed.

Carmel Hall was built and completed.

The Indoor Sports Complex was built and completed.

Nirmala Kumari Sevana building was built and completed.

Present Child Jesus Hall was built and completed.

Computer Laboratory was built and completed.

Helena Hall was built and completed.

Luxurious and Fully-equipped Auditorium and Joseph Vaz Hall were built and completed.

St. Joseph Hall was built and completed.