The history of the village of Sielec is inextricably connected to the history of the local Evangelical and Reformed church. In 1980, the building was converted into a chapel of the Roman Catholic parish in Koniemłoty. The church is located around 100 metres from the road from Staszów to Stopnica, at the road to Stefanówka.

Built at the end of the 18^th century on the site of an older, wooden structure, it has a rectangular main nave with a narrower chancel, which is polygonal on the outside and semi-circular on the inside.

There are two plaques on the external walls of the church. The one above the entrance is dedicated to Izabela Lubomirska nee Czartoryska, and the other to Postmaster Ross. The latter is an interesting example of historic Polish epitaph poetry.

The chancel and the nave are covered with a double-pitched roof. In the times of the Czartoryski family, Sielec became one of the centres of Protestant religious life in Lesser Poland, serving as the venue for the most important events of the local Evangelical and Reformed Church, including the synod of 1777. The popularity of the Evangelical denomination in the Staszów region was related to large numbers of German craftsmen invited by the Czartoryski family, and German settlers brought to Oględów and Niemścice by the Potocki family. The church was officially closed in 1944.