The church is designed in late Byzantine cross-in-square style.[7][11] It was constructed from stones and brickwork, a construction technique known as opus mixtum,[12] and measures 16 by 6.90 metres (52.5 ft × 22.6 ft),[3][12] 16 by 6.70 metres (52.5 ft × 22.0 ft), or 14.20 by 4.80 metres (46.6 ft × 15.7 ft), depending on the source.[2] The walls of the church are 0.80 metres (2.6 ft) thick.[13] The colour of the bricks gives the church a ruddy appearance.[5]