In 1791-1796 he was the main church of the monastery was erected - the Transfiguration Cathedral. The design of this magnificent temple completed by Giacomo Kvarnegi - the court architect of the imperial court, the author of many famous buildings (the Smolny Institute, the Hermitage Theatre, etc.). Perhaps the draft of the cathedral was not designed specifically for the monastery in Novgorod-Seversky, and the architect is not the case because he went too big and not suited to the convent ensemble. He still seems alien element in the monastery. While it is undeniable that the cathedral is simply magnificent. Construction of the cathedral accompanied by significant difficulties in the first place, with significant theft of materials that have been undertaken by contractors. Poor quality construction haunt in 1816, when the walls of the cathedral began to crack. We had to consolidate and strengthen the construction. The project is designed to strengthen the architect Anton Kartashevskii, who directed the work. It was then inside the cathedral, there were 16 paired Ionic columns.