The current building is the result of several building campaigns, starting at the end of the 12th century, as well as several fires.

Today, only the eastern part of the church can be traced back to the 13th century: this is the developed chevet with seven radiating chapels and an ambulatory surrounding the sanctuary. At the front, the transept dates from the same period and once opened onto a long, wide nave with two or three aisles. However, a serious fire brought it down before 1443. Today's nave comprises two eastern bays dating from the last quarter of the 15th century and two western bays built at the end of the 19th century, as evidenced by its neo-Gothic façade.

Formerly shared by clerics and parishioners, it is now entirely parish-owned. You can admire sumptuous liturgical furnishings from the late Middle Ages, paintings and statues from the modern era, as well as contemporary decor, including the trompe-l'œil painted in the 19th century by Piedmontese artist Casimir Vicario.