How to Plumb a Vanity Sink Drain on Second Floor

Installing or replacing a vanity sink on the second floor can feel intimidating—especially when it comes to plumbing the drain. Unlike ground-level installations, second-floor drains must account for gravity, venting, and potential access limitations. If you’re asking, “How do I plumb a vanity sink drain on second floor?” you’re not alone. Many homeowners worry about…