Following the canons of the Romanesque style, the church of Sant Esteve de Pelagalls (1180) faces east and has a single nave and apse. Inside the building, the only decoration is a continuous impost, while on the exterior there is a cornice supported by corbels: both types of decoration are in Provencal style.

The main door is in the purest Romanesque style. A transept was added to the original building in the 18th century, which as a consequence almost completely lost its Greek cross configuration and also a vestry. At around the same time, or perhaps a little later, the belfry was built above the western wall.

The interior, apse and main door are all elements that have remained practically intact from the original building.
The church of Sant Esteve de Pelagalls, in the municipality of Els Plans de Sió, was built by country folk, but country folk who knew how to cut stone and produce precise ashlars.