What determines the cost of a quality Madison car key replacement? How can you know beforehand what you will pay for these services? These are common questions that people worry about, but at sometimes it is impossible to determine. First of all, there are different contractors out there who offer car key replacement services. Because of this simple reason, you can expect that they will all charge you different rates for the work that they will do for you. You cannot really expect one contractor to charge you the same rate that another would, given that they are all working under different business conditions.