It was built in the style of a Byzantine basilica, inspired by Hagia Sophia,[1] with the main spires influenced by Transylvanian church architecture and Baroque elements.

[1] The idea of building an Orthodox cathedral in Sibiu began with Metropolitan Andrei Șaguna, who in the autumn of 1857 asked Emperor Franz Joseph I for permission to send a circular to his diocese requesting that priests and laymen give donations.

The iconostasis (of gilt carved wood) and dome (showing Christ Pantocrator flanked by angels) were painted by Octavian Smigelschi, from the nearby village of Ludoș.

Behind this and between the main towers is an ample semicircular vestibule with a similarly shaped stained-glass window, while the outside is decorated with round mosaics showing Jesus and the Four Evangelists.

Since its dedication, the cathedral has undergone a number of restorations and improvements: the walls have been decorated with neo-Byzantine paintings by Iosif Keber and Anastase Demian, and liturgical objects, vestments, books and a sound system have all been added.