The church design is very unusual for Byzantine architecture.
The church is constructed as a double-church featuring two naves adjacent to each other and separated by a wall.
The naves were quadrangular and each featured a separate dome.
The naves have a common narthex of an oblong shape.
The twin church design at Üçayak has two naves (naoi) each with a separate semi-circular apse.
Each apse includes a rectangular bay in front of it.

The double-church design is even more unusual because the two churches were constructed at the same time, as opposed to being built sequentially, which was the construction method employed more often for churches of this type.
Scholars speculate that the double church was constructed either in honour of two distinct saints or martyrs, or because a Byzantine emperor and his wife built it; the latter explanation being more probable, since no crypts or other artefacts, attesting to the worship of saints or martyrs, have been found.
The church design is very unusual for Byzantine architecture. The church is constructed as a double-church featuring two naves adjacent to each other and separated by a wall. The naves were quadrangular and each featured a separate dome. The naves have a common narthex of an oblong shape. The twin church design at Üçayak has two naves (naoi) each with a separate semi-circular apse. Each apse includes a rectangular bay in front of it.
The double-church design is even more unusual because the two churches were constructed at the same time, as opposed to being built sequentially, which was the construction method employed more often for churches of this type. Scholars speculate that the double church was constructed either in honour of two distinct saints or martyrs, or because a Byzantine emperor and his wife built it; the latter explanation being more probable, since no crypts or other artefacts, attesting to the worship of saints or martyrs, have been found.
Üçayak Byzantine Church