The answer to 'shut-off valve installation cost' is that the cost can vary significantly depending on several factors. In general, the installation of a shut-off valve by a professional plumber typically ranges from $150 to $500, but the exact price will depend on the type of valve, the complexity of the installation, and your location.
The cost can be influenced by factors such as the accessibility of the plumbing, the need for any additional piping or fittings, and the labor rates in your local area. Additionally, the cost may be higher if the shut-off valve is located in a difficult-to-access area or if the installation requires extensive work to the existing plumbing system.