The abbey church is characterized by its two architectural styles. On the one hand, the nave and the transept, dating from the Romance time, on the other hand chorus and radiating chapels high lasting the Gothic time. The nave, built partly on the Carolingian church, dates from the 11th century. It will be cut down by three spans at the 18th century.

The chorus, true chief of Gothic work of art, was high following the collapse of the Romance chorus in 1421. The building work will last one century and will be completed in 1521. The keystones are magnificiently armoiriées.