Designed by a local architect, P.J. Dodd, St Mary’s is another large Catholic church in a gothic style. The exterior is dominated by the slender tower and spire. At ground level the façade has three large gabled entrances with mouldings and carvings. The interior is richly decorated and very dark. This is due to the fact that the aisle windows (and there are only windows on one aisle) are filled with very dark stained glass so the only natural light is via the clerestory windows.