The answer to 'shut-off valve vs' is that shut-off valves and main water shut-off valves serve different purposes in a plumbing system. A shut-off valve is typically located near an individual fixture, such as a sink or toilet, and allows you to turn off the water supply to that specific fixture. This is useful for making repairs or replacements without shutting off the entire home's water supply. In contrast, the main water shut-off valve is located where the main water line enters the home and controls the water supply to the entire house. This valve is critical for turning off the water in an emergency or when performing whole-home plumbing work.
Shut-off valves are generally less expensive than main shut-off valves, costing anywhere from $5 to $50 depending on the size and type. Main shut-off valves can range from $50 to $200 or more, as they are larger and require professional installation. Both types of valves should be accessible and easy to operate, and it's a good idea for homeowners to know the location of their main shut-off valve in case of a plumbing emergency.