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. Typically, basic shut-off valves for residential plumbing can range from $10 to $50, but more specialized or larger valves may cost significantly more.
The main factors that influence the cost of a shut-off valve include the size, material, and brand. Valves made of brass or stainless steel tend to be more expensive than basic plastic or chrome-plated models. The location where the valve is installed and whether it requires additional plumbing work can also impact the overall cost.