If the doorbell rings whilst I am praying
Question

                If I am praying and the doorbell rings, and there is no one else in the house, what should I do?.
Praise be to Allah.
    If it is a naafil prayer, then the matter is broad in scope 
    and there is no reason why you should not interrupt the prayer and find out 
    who is at the door. But if it is an obligatory prayer, you should not rush 
    unless there is something important that you fear you may miss. If it is 
    possible to alert the person at the door to the fact that the person inside 
    the house is busy praying, by saying tasbeeh for a man or clapping for a 
    woman, then that is sufficient, as the Prophet SAWS (peace and blessings of 
    Allaah be upon him) said: “Clapping is for women and the one who notices 
    something whilst praying, let him say Subhaan Allaah.” 

    If it is possible to tell the person at the door that the man 
    is praying by saying tasbeeh or that the woman is praying by clapping, that 
    should be done. If that will not serve any purpose because one is far from 
    the door and will not be heard, then there is nothing wrong with 
    interrupting the prayer in the case of need, especially naafil prayers. In 
    the case of the obligatory prayer, if there is the fear that the person is 
    at the door for some important reason, then there is also nothing wrong with 
    interrupting the prayer, then one can go and start the prayer from the 
    beginning. Praise be to Allaah. End quote.