the biggest factor is what type of faucet it is and what is the going labor rate per hour where you live,if its an old washer type(bibb washer) or if its a spring and cup type,it could be anywhere from $25.00 to $75.00 if the person that comes out to do it is like most plumbers,but know this you can buy a new one (faucet) for that price,why don't you do it yourself,its not that hard to do and you can either get advise from here or go to the DIY web site and get a full description and video on how to and save your self that money