The building work completed in 1601 A.D. on Bhadoon Sudi 1st, 1661 Bikrmi Samvat (August/September,1604). Guru Arjan Sahib installed newly created Guru Granth Sahib, in Sri Harmandir Sahib and appointed Baba Budha ji as its first Granthi i.e. the reader of Guru Granth Sahib. After this event it attained the status of ‘Ath Sath Tirath’. Now the Sikh Nation had their own Tirath, a pilgrimage center
Sri Harmandir Sahib, is built on a 67ft. square platform in the centre of the Sarovar(tank). The temple itself is 40.5ft. square. It has a door each on the East, West, North and South. The Darshani Deori (an arch) stands at the shore end of the causeway. The door frame of the arch is about 10ft in height and 8ft 6inches in breath. The door panes are decorated with artistic style. It opens on to the causeway or bridge that leads to the main building of Sri Harmandir Sahib. It is 202 feet in length and 21 feet in width.
The bridge is connected with the 13 feet wide ‘Pardakshna’ (circumambulatory path). It runs round the main shrine and it leads to the ‘Har ki Paure’ (steps of God). On the first floor of “Har Ki Pauri“, there is continuous reading of Guru Granth Sahib.
The main structure of Sri Harmandir Sahib, functionally as well as technically is a three-storied one. The front, which faces the bridge, is decorated with repeated cusped arches and the roof of the first floor is at the height of the 26 feet and 9 inches.
At the top of the first floor 4 feet high parapet rises on all the sides which has also four ‘Mamtees’ on the four corners and exactly on the top of the central hall of the main sanctuary rises the third story. It is a small square room and have three gates. A regular recitation of Guru Granth Sahib is also held there.
On the top of this room stands the low fluted ‘Gumbaz’(dome) having lotus petal motif in relief at the base inverted lotus at the top which supports the “Kalash” having a beautiful “Chhatri” at the end.
Its architecture represents a unique harmony between the Muslims and the Hindus way of construction work and this is considered the best architectural specimens of the world. It is often quoted that this architecture has created an independent Sikh school of architecture in the history of art in India.