The spouse's name can be added to the already registered property in two ways. Firstly, you can execute a sale deed favouring your spouse and get it duly registered with the concerned sub-registrar of the area. One needs to do so by paying the necessary transfer fees. Secondly, you can also execute a gift deed in favour of your spouse and get it duly registered with the sub-registrar. This registration has to be in the said jurisdiction and on a duly stamped deed. You can specify the portion of the property, either 50% or any other percentage of the portion of your choice that you wish to give to your spouse.