St. Brigid’s church, Killargue was built in 1791 when Rev. John McGourty was parish priest. It was a thatched building.

There was a major renovation in 1852 when Rev. Patrick O’Reilly was parish priest and Rev. James McGourty was curate. A nave was added to the original oblong building. Most of the labour was carried out by men from the parish. Stones were quarried locally and carted to the site.

There was further major alterations carried out in 1961 when Rev. John Donohue was parish priest and Rev. Edward Burns was curate. The transepts were removed and a new porch was built. Side porches were added in 1991 when Rev. Patsy Young was parish priest and Rev. Maurice McMorrow was curate. This was done in preparation for the Bicentennial Mass.