The first stone church was built around 1050. At that time there were no bricks here and the building was built with tuff. The side walls of the nave (left of the main entrance) are from that time.
There, on the wall near the roof tiles, another typical Romanesque building element is visible, namely the round-arch frieze. The name of this decorated band comes from the Latin word frisium, which means decoration / fringe.
This goes back to the Phrygians, an artistic people from classical antiquity.
In the course of time the church has been adapted again and again. To the right of the main entrance, the traces of an earlier chapel are still visible. In the Northern Netherlands, the introduction of the Gothic architectural style took place through renovations. Romanesque and Gothic elements can be found in many old Groningen churches. This is clearly visible in the Church of Leermens. The windows with the pointed arches are an example of a later adaptation in the Gothic style.
Another special aspect of the church of Leermens is the flexibility of the tuff wall. This is clearly visible on the side of the mound excavation. Despite the deformation (convex) wall, it does not show any cracks.