 The west porch was first built in the 15th century at the time the south tower was erected and was completely rebuilt in 1888.The west porch gable dates to the 13th century but was reworked in the 14th century and a rose window was added in the 16th century.Two doors give access to the cathedral, and the trumeau is decorated with a standing Virgin Mary which came from the Chapelle Saint-Colomban in Peumerit-Quintin.