The answer to the cost to install a smoke detector in Illinois is that it typically ranges from $50 to $200 per detector, depending on several factors. The main factors that affect the cost include the type of smoke detector, whether it's wired or battery-powered, the complexity of the installation, and the labor rates in your local area.
For a basic, battery-operated smoke detector, the cost is usually on the lower end of that range, around $50 to $100. If you need to install a hardwired smoke detector that connects to your home's electrical system, the cost will be higher, typically $100 to $200 per detector. The labor costs can also vary depending on whether you hire a professional electrician or attempt a DIY installation.