The construction of the brick church of St. Catherine in place of an old wooden church was begun in 1320, and completed in 1328. It was expanded in 1568, which is confirmed by a tin flag with the date at the eastern gable. In 1628, during the Thirty Years War, the Swedes burnt the entire city together with the church, from which only the walls of the nave remained. After several years, the presbytery was rebuilt and the church was completely rebuilt only in 1710-1719. In 1848 a porch was added from the north. Since then, its Gothic silhouette with late renaissance and Baroque elements has not changed.
The church was erected in the southern part of the town, at the gate called the South, where it bordered the town walls. It is orientated, made of red bricks, in older parts in the monk bond, and in the later parts in the Flemish bond. The entire structure is 54 meters long, 21 meters wide and 15.4 meters high. The rectangular, three-aisle and three-bay nave is clasped with single-step buttresses. On the eastern side, it is adjoined by a straight ended chancel, originally three-bay. The pointed windows in the nave are framed with blendes similar to them. Above the present entrance from the south side, there is the outline of the original ogival entrance. The eastern gable of the nave is triangular, brick in the lower zone, and timber-framed in the upper one with three ogival windows. The western façade was topped with a triangular gable decorated with blendes and the original multi-step, moulded entrance portal.
Website odznaka.kuj-pom.bydgoszcz.pttk.pl, Kościół p.w. św Katarzyny w Łasinie.