Reseling without sales deed

Your query is that you have entered into a sale agreement with a prospective buyer to sell your flat upon certain conditions within some stipulated period.  Well, if the conditions have been fulfilled, i.e., if the balance of sale consideration amount has been received by you, you can very well proceed with executing the registered sale deed in his favor at his expenses.  what is your query?

Hi

I dont have sales did with builder

person who want to buy want sales deed with me

will it be legal?