The answer to 'how much to replace smoke detector in Chicago' is that the typical cost to replace a smoke detector in the Chicago area can range from $50 to $150 per unit, including labor. The final price will depend on factors like the type of smoke detector, whether it's hardwired or battery-powered, and the complexity of the installation.
Most standard smoke detector replacements are relatively straightforward for a professional electrician, taking 1-2 hours of labor. However, costs can be higher if the old detector needs to be rewired or if there are accessibility issues. It's best to get quotes from local electrical service providers to get an accurate estimate for your specific needs.