The Bishop's palace is of great simplicity. Only its northern side has twin or triple bay panels for decoration. Rectangular shaped, the palace has several rooms: the tinel (the bishop's dining room), the kitchen, the synodal room for large assemblies. This last room is illuminated by the bays of the building with the most workmanship, showing the important role formerly held by the Assembly of the Diocese.

At the end of the 14th century, a private Episcopal chapel was added to the south west of the building. The upper parts of its outer walls are decorated with Lombard bands, echoing the design of the cathedral. The bases of the small arches are decorated with various representations: the bishop himself is represented here.
The Bishop's palace , now the Town Hall, underwent many modifications from the 18th century to the present day: several levels were added and an open staircase was built to serve them.