The answer to 'how much does shut-off valve cost' is that the cost of a shut-off valve can vary widely depending on several factors. Shut-off valves come in different materials, sizes, and styles, which can significantly impact the price. Additionally, the cost of labor and installation can also affect the overall cost.
Generally, you can expect to pay anywhere from $20 to $200 or more for a basic shut-off valve, depending on the type and quality. More complex or specialty valves, such as those used for water heaters or appliances, can cost even more. The cost of installation by a professional plumber should also be considered, which can range from $50 to $200 or more depending on the job's complexity.