We don’t include water shut-off valve replacement in the cost of our basic toilet installation, but we’re happy to add it if necessary. Although it’s usually recommended that this important part be replaced, our team would never make that a requirement as some other commission-type plumbing companies do. We’re glad to leave it alone as long as it is functioning properly and doesn’t leak during normal operation. There are only a few other situations in which we would strongly suggest that you replace the shut-off valve: -If your home is older than 12 years -If the valve is poorly designed or made with inferior materials, like plastic threads or plastic stems -If you have a PEX push & pull type valve -If we do this work, we’ll adjust the price at the time of installation as a convenience to you.