The sale/purchase deed and the housing society share certificate are the major documents required while selling a property. Sale deed serve as confirmation for the land belonging to the seller only and he has full rights to sell the land. Some more documents such as NOC from the housing society, registered house documents and original copies of stamp duty are necessary. Also, the owner/owners have to submit documented consent if it is a joint ownership land.
The NOC from the society and title clearance are necessary, but they are not sufficient. The exact details of how old the building is, the carpet and built-up area, car parking status, the floor plan, land title (free hold/lease hold/collectors land), the conveyance of the society and transfer charges of the building and the apartment also have importance.