The answer to 'how much does smoke detector cost in Illinois' is that the cost of smoke detectors can vary widely depending on the type, features, and where you purchase them. Typically, basic smoke detectors for residential use range from $10 to $50 each. More advanced models with additional sensors or smart home integration can cost $50 to $100 or more.
The cost is influenced by factors like the technology (ionization, photoelectric, or dual-sensor), the power source (battery or hardwired), and whether the detector is standalone or part of an interconnected alarm system. Installation costs can also add $50 to $150 per detector if you hire an electrician. To get the best price, it's recommended to shop around and get quotes from local home improvement stores, online retailers, and licensed electricians in your area.