The answer to 'how much does shut-off valve cost in Illinois' is that the cost of a shut-off valve can vary widely depending on several factors. Typically, the cost for a basic shut-off valve can range from $10 to $50, but the final price will depend on the specific type, size, and material of the valve, as well as the labor costs for installation.
Factors that can influence the cost of a shut-off valve include the valve's material (such as brass, stainless steel, or plastic), the valve's size (1/2 inch, 3/4 inch, etc.), and whether it's a simple ball valve or a more complex gate or globe valve. Additionally, the cost of labor for a plumber to install the valve can add $50 to $150 or more, depending on the complexity of the job and the plumber's hourly rate.