Seyed Mosque is one of the great and historical mosques of Isfahan which was built during the Qajar period and is one of the main mosques of this city. This mosque, which has semi-functional decorations, has four main doors, two forty columns large naves, a dome, three porches and more than 45 rooms, but it does not have a minaret. Also, the inside of its naves is not tiled.
Seyed Mosque is one of the masterpieces of Qajar architecture due to its beautiful tile and calligraphy decorations of this period.
In facade tiling of the building of this mosque, red color has been used a lot, which is one of the features of architectural decorations in the Qajar period.
Numerous rooms around the wide courtyard of Seyed Mosque are used by religious students. There is a building with an architecture similar to the Chehel Sotoon architecture on the upper floor on the east side of the mosque, which was apparently used by Seyed Mohammad Baqer Shafti, the builder of this mosque. Seyed Mohammad Baqer Shafti was an influential cleric of Isfahan during the reign of Fath Ali Shah Qajar, when the construction of the Seyed Mosque began. His tomb is located in the northern part of the mosque and has beautiful and remarkable architecture and tiled decorations.