The church was consecrated in 1735 and is the only one of its kind in the country; its late baroque style is more usually found in southern Germany and Italy. It is believed to be to a design by James Gibbs. The exterior was originally plain brick but was later clad with limestone ashlar and Italianate balaustrades and finials were added. It has a clock tower surmounted by a cupola with a gilded dome, topped off with an orb and a golden cross. There are two bells, to chime out the time and to ring for weddings and funerals. It has a crypt with vaults, still occupied by lead coffins, and has a coffin chute accessed from the inner porch.