The atriums leading to the north and south doorways were restored from January 2011 to 2015, on the initiative of The St John’s Co-Cathedral Foundation. The dome and wall carvings of each atrium suffered from prolonged deterioration, due to the infiltration of rain water from the dome. This caused irreparable loss of the gilding and the erosion of some carvings. Restorers had to remove thick layers of candle soot deposits, dust and stubborn encrustations from the structure. The loose stone carvings were later consolidated before re-gilding was applied. Restorers used 24 carat gold leaf and adopted the same gilding process used in the seventeenth century.