There is a little campanile attached to the far end of the left hand aisle, the cubical bellchamber of which is perched at the nave roofline. It has a double arched soundhole on each side, invisible from the street. Above this is an octagonal storey, with an arch on each face having a stone archivolt and with two little tondi above. Then comes perhaps the most interesting thing about the exterior of the church, a stumpy spire in polychrome tilework mostly in gold but with purple and green zig-zags. There is a ball finial.