St. Helen's Parish was established in 1875 in Brockton village, just outside the city of Toronto's western boundaries.

The parish grew quickly as English speaking Catholics found work in the neighbourhoods chocolate factories, railway yards, foundries, and industry.

[3] Arthur William Holmes, a prominent ecclesiastical architect designed the existing Gothic Revival style church on Dundas Street.

[4] Holmes designed the building in a style typical of large Anglican and Catholic churches in England and Ireland.

In 2000, the Church received a Papal blessing from Pope John Paul II to mark it's 125th anniversary.