The high altar is made of carved oak in neo-Norman style with grape vine decoration, surmounted with a slab of porphyry. Seven lamps represent the gifts of the Holy Spirit. The reredos is in gilded oak, and was designed by Hay & Henderson in 1896. The lancet windows depict the crucifixion, with Saint Paul and Saint Columba on either side. The roof of the nave is a hammer beam structure with wooden gargoyles. The pulpit is made of carved oak, with figures of saints, and was built in 1892.