There remains of the primitive construction the vaulted choir in cradle and the apse in oven ass lit by three small windows. In the twelfth century, the arm of the transept and the north apse gave way to a bell tower on a dome whose substructions are difficult to connect with the preserved parts of the early church. In the thirteenth century, the crossing of the nave and the transept was vaulted with ridges. In the sixteenth century both aisles were built. In more recent times, the nave and the aisles, which were panelled, were covered with plaster vaults; the bell tower was raised from one floor and covered with an arrow in polychrome tiles.