During the Reformation the town turned against Interlaken Monastery and did not join the Berner Oberland uprising. As a result of their loyalty they were rewarded with the Alp Sefinen. In 1364, a fire broke out in the Monastery's mill. It spread to the village of Unterseen and destroyed much of it. In 1470 Unterseen was burnt down for the second time and Bern undertook the reconstruction with the town house in the center. A chapel was first mentioned in the village in 1353. It was rebuilt in 1470 following the fire. The current church building was built in 1852 after part of the older church collapsed.