The answer to 'how much to replace junction box in Illinois' is that the cost can vary significantly depending on several factors. In general, you can expect to pay anywhere from $150 to $500 or more to replace a junction box, depending on the complexity of the job and your location within Illinois.
Some key factors that influence the cost include the size and type of junction box needed, the accessibility of the existing box, whether any electrical wiring needs to be rerouted or upgraded, and the labor rates in your local area. Replacing a basic junction box in an accessible location may be on the lower end of the range, while a more complex job in a hard-to-reach area could be on the higher end.