It is a 12th century building, with a single rectangular nave covered with a pointed barrel vault with a slightly deviated apse with a quarter-sphere vault, decorated with a saw-toothed cornice of which there’s only a fragment of the original piece.

Two chapels from a later period open in the middle of the nave, which seem to form a false transept. The construction of the southern chapel and the sacristy covered two Romanesque windows located at the top of the building. On the altar of the north chapel we find a stone of uncertain origin with a rather primitive relief.

The presbytery is unusually deep and houses two niches, the south of which has been used to open the sacristy door. The baptismal font is in place of the old door transformed into the fountain of the Chapel of the Baptismal Fountains with a stone spout on the wall and a square limestone sink with a kind of heart or shield on the front. The space is decorated with paintings that refer to the creation and are by the artist Aurora Altisent. On the west façade there is the new front door. Next to it there is a 1984 white marble plaque commemorating the presence of the parish of Prullans in the Act of Consecration of the Cathedral of Urgell.