Loreto Day School Sealdah was inaugurated on August 1, 1857, under the principalship of Sister Mary Catherine Cantopher. In 1902, the school relocated to its present site donated by the Archbishop of Calcutta. Mother M. Martina Wilson and Sr. Evangelista Considine being sent to Loreto Day School Sealdah, the sisters travelling to and from Loreto House daily by ‘gharry’, a horse-drawn cab or carriage.

Over the years, like a huge 3-D puzzle, Loreto Sealdah has had buildings repeatedly built, extended, modified and removed. In 1927 a new section comprising a concert hall and large second story classroom was erected. A ‘free’ school block, for the economically deprived local population, was built inside the gate in 1932. A description of the school from 1954 depicts how: “Two rather old-fashioned houses contain classrooms which have something about them that tends to foster that ‘homely’ spirit – an informality that is never indiscipline..”

Under the leadership of Mother Dorothy, some Loreto schools began to challenge the code for Anglo-Indian schools whereby only a token group of poorer Indian students would be admitted, saying, “I could not bear to close the doors of our schools to Indian children in their own country” (Colmcille, 1968, p.281). Thus, the Loretos began to operate ‘free’ schools alongside their regular schools. In time this saw 20 percent of all admissions being reserved for the economically deprived.

Increasingly over the years, and particularly since the arrival of S. M. Cyril in 1979, Loreto Day School Sealdah has undergone a procession of structural alterations, all tailored to meet the perceived educational needs of a growing school. Slowly the school’s scholastic reputation grew and as private schools went, it was regarded as a good school with sound delivery on its academic promises.