The answer to 'how much to replace switch in Illinois' is that the cost to replace a light switch can vary significantly depending on several factors. Generally, you can expect to pay anywhere from $50 to $200 or more to have a professional electrician replace a single light switch, including labor and materials.
The exact cost will depend on the complexity of the job, the type of switch being replaced, the accessibility of the electrical box, and whether any additional electrical work is needed. Older homes or more complex wiring may require more time and effort, increasing the overall cost. It's essential to get quotes from local, licensed electricians to get an accurate estimate for your specific situation.