Both the external and internal decoration on the church was carried out at the same time. Cast iron floor slabs were delivered from Moscow. Also, forms were made for the church's windows, doors, walls, and for space under the cupola. The planned iconostasis, designed by Rastrelli, was also added. The wood for the iconostasis, altar canopy, pulpit, and tsar's place were carved in Saint Petersburg in order to conserve time. The iconostasis' icons were carried out by Petersburg artists. For gilding, 1,028 slabs of gold were used in the interior.