How to Replace a Bathroom Sink Faucet

Faucets are the workhorses of the bathroom, but they eventually succumb to mineral buildup, internal leaks, or just outdated aesthetics. Replacing one is a rite of passage for any homeowner; it is a project that yields immediate, satisfying results without requiring a professional plumber's hourly rate. Success here relies on patience under the sink. You will be working in a cramped space, often with rusted hardware, so having the right tools on hand to gain leverage is the difference between an hour of productive work and an afternoon of frustration. A job well done means a dry vanity cabinet, smooth handle operation, and zero leaks at the connections.

1. Shut Off and Bleed. Locate the shut-off valves under the sink and turn them clockwise until fully closed. Open the faucet handles to bleed out any remaining pressure and residual water before proceeding.
2. Free the Supply Lines. Use an adjustable wrench to loosen the nuts connecting the supply lines to the shut-off valves. Once free, unscrew the other ends where they attach to the faucet shanks.
3. Extract Old Faucet. Reach behind the basin and use a basin wrench to unscrew the mounting nuts holding the faucet body to the countertop. If the nuts are corroded, use a small hacksaw to carefully cut through them.
4. Scrub and Dry. Lift the old faucet out and scrub the mounting area on the vanity deck with a mild cleaner to remove old caulk or lime deposits. Ensure the surface is perfectly flat and dry for the new gasket.
5. Mount New Faucet. Place the new faucet gasket over the mounting holes, insert the shanks, and secure it from underneath using the provided mounting nuts and washers. Tighten them by hand, then snug them up with a basin wrench.
6. Reconnect Water Lines. Attach the supply lines to the shut-off valves and the faucet shanks, ensuring you use the rubber washers provided. Do not overtighten; a firm turn with the wrench beyond hand-tight is sufficient.