The answer to 'how much to replace switch' is that the cost to replace a light switch can vary widely depending on several factors. Typically, the cost ranges from $20 to $100 per switch, including both the materials and labor. The exact price will depend on the type of switch, the complexity of the electrical work required, and whether you hire a professional electrician or do the work yourself.
Some key factors that influence the cost include the switch type (basic vs. smart/dimmer), the accessibility of the electrical box, the need for any additional wiring or drywall work, and your location. Hiring a licensed electrician will generally cost more than a DIY project, but can ensure the work is done safely and up to code.