Under The Registration Act 1908 it is made mandatory to register all transactions and registration of property is also one them. For registering property seller needs all documents to prove he is the owner and from registrar office you will get required form to transfer the ownership. You can seek legal expert help for the same
You have to register the property as it is made mandatory by law. After you have brought a property, you need to register the sale deed with the period mentioned in the deed. You will require a completion certificate along with a possession letter from the developer. Currently the registration fee is 1% of the market value of the property.