The edifice being constructed as a contribution to the establishment of democratic institutions in the war-torn country was earlier scheduled to be completed this year.
"The building having influence of Mughal and modern architecture is being constructed under challenging circumstances and is now scheduled to be handed over to the government of Afghanistan in December next year," an official said.
"Challenging working conditions and delay in availability of some materials have further delayed the project and the revised deadline for completion of the project is June 2015 and it will take another 4-5 months to hand over after the work is finished," G S Pant, Project Manager, Central Public Works Department - Government of India, told PTI here.
The building, which will have Asia's largest dome as one of its key features, is taking shape between the decades-old historic landmarks King Palace 'Darul Aman' and Queen Palace - which bear the marks of the war and tell the story of conflicts and devastation.
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"Civil work is ready and most of the flooring work has been completed. For outer cladding, we are using white marble from Herat and from Makrana in Rajasthan and other parts of India."
"The edifice will have two domes; main of them is copper clad dome of 32 meter diameter and 17.15 meter height covering the main assembly hall and the other is glass dome on Entrance Lobby," he said.
A water body with 9 cascading fountains is also being constructed in front of the building. Inside the building, a 20-feet-high fountain made of beautiful green marble in Udaipur will also be installed.