It was built entirely of brick, a material typical of Dombes fortifications and noble houses, such as the fortified house of Villon, the castles of Sandrans or Châtillon-sur-Chalaronne, as well as the upper part of the medieval walls of Trévoux. As such, it is an emblematic monument of Dombist architecture.
The keep underwent an exceptional restoration in 2010: its terrace regained its frame and elegant glazed tile roof. The restoration also saw the rebuilding of the hourds at the keep’s four corners. These are wooden devices attached to the wall overhang at the very top of the keep. They were used to release projectiles or fire to defend the foot of the keep.