The building exemplifies Sikh architecture, it is gilded fluted domes and cupolas and an ornate balustrade round the top. Ranjit Singh's ashes are contained in a marble urn in the shape of a lotus, sheltered under a marble pavilion inlaid with pietra dura, in the centre of the tomb.
The funerary urns were removed from the marble pavilion and were replaced by a simple slab around 1999. This was done as part of the preparations for the Khalsa Tricentenary and the visit of Sikh dignitaries from India. The Samadhi was damaged by the earthquake in October 2005.