It has the tallest spire in Dublin (231 ft), and occupies a prominent position on high ground overlooking the Liffey Valley.
Its architect, E. W. Pugin, adopted a 14th-century Decorated Gothic style.
The church, built between 1844 and 1849, was in a decorated gothic-style, designed by Joseph John Scoles, and with the altar by A.W.N. Pugin, and is now a Grade II* listed building.