The answer to 'cost to install junction box in Illinois' is that the cost can vary significantly depending on several factors. Generally, the installation of a junction box by a professional electrician in Illinois can range from around $100 to $400 or more, depending on the complexity of the job, the materials needed, and the electrician's labor rates.
Some key factors that influence the cost include the location of the junction box (accessibility and any necessary drywall or other construction work), the size and type of junction box required, whether additional electrical work is needed (such as running new wiring), and the hourly rate charged by the electrician. It's important to get local quotes from licensed and insured electrical contractors to get an accurate estimate for your specific project.