The city development authorities - for eq. The Chennai Metropolitan Development Authority CMDA is the appropriate authority for building sanctions in Chennai. This is a decentralized activity - the various panchayat union and municipal unions can accord sanction on behalf of the CMDA in respect of property located within their jurisdiction.
The non-judicial stamp papers are required to be purchased in the name of either the purchaser or seller. Generally it is bought in the name of the purchaser since he bears the expenses of registration.