St. Patrick’s Church, London, Ontario was the last of the Barry Byrne churches. Built as an economy church, the construction was of simple brick for both interior and exterior, the interior walled in cement blocks. Annette Cremin Byrne, designed the interior painting of the walls to take the form of white and yellow designs. The windows consist of glass tile as used in St. Columba’s. side aisles are used to house the confessionals and are illuminated by horizontal stained glass windows. The sanctuary wall had an interesting zig-zag pattern. Later renovation of this site, covered the side walls with a pink stucco and the sanctuary with marble.