 GDP from Construction at factor cost (at current prices) increased to 1.745 billion (12.02% of the total GDP ) in 2004-05 from 1,162.38 billion (10.39% of the total GDP) in 2000–01.The main reason for this is the increasing emphasis on involving the private sector infrastructure development through public-private partnerships and mechanisms like build-operate-transfer (BOT), private sector investment has not reached the expected levels.The Indian construction industry comprises 200 firms in the corporate sector.