The opening ceremony of Heydar Mosque has been held on December 26, 2014. The mosque covers a total area of 12,000 square meters and internal area of the building covers a total area of 4,200 square meters. The façade of the building decorated with special stones based on the Shirvan - Absheron architectural style. It has four 95m-height minarets. It has 55m-height main and 35m-height second domes. Verses from Koran were written on the sides of domes.