First built as a Roman Basilica in romanesque style, the church later took on a gothic appearance with renaissance elements. Only the nave has been preserved from of the original church built between 1240 and 1270. Throughout the centuries, gothic elements were added to the structure, such as the richly decorated choir built between 1361 and 1382. The Evangelical Church in Sebes boasts the largest altar of all churches in Transylvania. Richly decorated with paintings and carvings, the polychrome wooden altar was designed between 1518 and 1526, marking the transition from gothic to renaissance style.

The church was repainted in 1752 and again, in 1904. In the late 18th century, an organ made by Master Johannes Hahn of Sibiu was placed below the belfry. In 1893, it was replaced by a new organ made by the brothers Rieger of Jagendorf (Silesia).

St Jacob’s chapel, on the north side of the church, was built in gothic style in the 14th century.  Images depicting the lives of St Francis of Assisi and St Nicholas are still visible on the murals.