Dear Querist
My opinion on your queries are as under:-
A) Will this require registration / payment of stamp duty?
Opinion:- Yes, the registration is required but you can choose the family settlement deed executed between you and your wife based on your settlement and execute the family settlement Deed before the Registrar/Sub-registrar of area. the Cost for registration of family settlement Deed is very nominal and convenient for both of you for all purpose.
B) What document I need to execute to facilitate the transfer of flat to wife's name?
1) For Housing Society record 2) For Sub-Registrar Office to record the transfer?
Opinion: After execution of family settlement deed you or may submit the same before the Housing Society and the society may change the same in your wife's name as per settlement deed(registered).
C) A couple of months later, if wife decides to sell the flat (to a third party), will it require me to execute new / more documents?
Opinion:- No, until and unless the buyer wants to execute sell deed by both of you. otherwise there is no requirement because in the settlement Deed it will be mentioned that she has all rights to sell, rent or mortgage the property.
Feel free to call