Person dies with no will

Hello Everyone, My mother recently died without WILL survived by me (Only child) and my father.My mother was the sole owner of the house.My question is:

1) I want to sell the property do i have to transfer the ownership to my father by giving NOC from my side e.g  i have no interest in the property and father can sold this property?

If yes what is the procedure and how much time it will take.Property is in delhi. Their is no dispute as im the only child

Thanks