The answer to 'how much to fix pressure regulator' is that the cost can vary significantly depending on several factors. Typically, the cost to repair a pressure regulator can range from $150 to $500 or more, depending on the complexity of the issue and your local plumber's labor rates.
Some key factors that influence the cost include the type of pressure regulator (residential vs. commercial), the accessibility of the regulator, the extent of the repair needed (e.g., replacing the regulator vs. just adjusting it), and your location. Plumbers in high-cost urban areas will generally charge more than those in rural or suburban areas. Additionally, the age and condition of your home's plumbing system can also impact the overall cost.