The answer to 'how much to replace smoke detector in my area' is that the cost to replace a smoke detector can vary significantly depending on your location, the type of smoke detector, and whether you hire a professional electrician or do it yourself. Typically, the cost for just the smoke detector device itself ranges from $10 to $50, with more advanced models costing more.
If you hire an electrician to replace the smoke detector, you'll likely pay an additional $50 to $150 or more for the labor and any necessary wiring or installation work. The total cost can be influenced by factors like the accessibility of the detector location, whether it's hardwired or battery-powered, and the hourly rate of the electrician in your local area.