The answer to the cost of backflow preventer repair is that it can vary widely depending on several factors. Typically, homeowners can expect to pay anywhere from $150 to $500 or more for a basic backflow preventer repair. The exact cost will depend on the type and complexity of the repair, the location and age of the system, and the labor rates in your local area.
Factors that can influence the cost include the parts and materials needed, the difficulty of accessing the backflow preventer, whether any additional plumbing work is required, and the hourly rate of the licensed plumber performing the repair. More complex issues like a complete backflow preventer replacement can cost significantly more. It's essential to get quotes from local plumbers to determine the specific cost for your home.