The National Building Code of India is published by the Bureau of Indian Standards. It can be purchased and downloaded from the BIS website here:
There are a number of construction-related standards applicable in India as well, and these can also be accessed though the BIS website here:
Please note that the building code must be implemented by each Indian state independently, so you would be well advised to check with the local authority if you have any questions about the enforcement of all of these codes and standards. The Council of Architecture may be able to provide some additional insight on a state-specific basis. Their website is