The answer to 'how much to replace surge protection' is that the cost can vary widely depending on several factors. Typically, the replacement of a basic whole-home surge protector can range from $100 to $500, depending on the type of device, the complexity of the installation, and whether you hire an electrician or do it yourself.
Factors that influence the cost include the size and age of your home, the location of the existing electrical panel, the type of surge protection needed (whole-home vs. individual device), and whether any additional electrical work is required. Hiring a licensed electrician will generally cost more than a DIY installation, but can ensure the job is done safely and to code.