The belfry tower, 27 meters high, is part of the historic ensemble of northern belfries inscribed in 2005 in addition to the Belgian belfries on the UNESCO World Heritage List.
The square brick tower is topped by a lantern which houses the last bell of the city (which does not ring anymore). The austere architecture of the current belfry dates from its reconstruction in 1827, but the belfry exists before 1582. Repeated constantly since the eighteenth century, ruined in 1821, the old tower is deliberately demolished. The architect Gravez is responsible for a no-frills reconstruction. From the old tower it takes the foundations and the silhouette but simplifies the decoration.