How to Install a New Bathroom Vanity Faucet

Faucets are the jewelry of the bathroom, but unlike a necklace, they have to work perfectly every single day while sitting in a puddle. Over time, original hardware corrodes and seals fail, leading to slow drips and rust stains that detract from an otherwise clean space. Replacing one is a straightforward task that instantly elevates the look of your sink while fixing nagging leaks. Success here comes down to two things: tight connections and a clean surface. You are working in a cramped space under the sink, so efficiency is key. Clear the cabinet out completely, bring a good light source, and focus on securing the base of the faucet before you try to connect the water lines. When it is done well, you will have a rock-solid fixture that operates smoothly without a single drop escaping.

  1. Kill the Water First. Locate the shut-off valves under the sink and turn them clockwise until they stop. Open the faucet handles to bleed off any remaining pressure and drain the lines.
  2. Extract the Old Fixture. Use an adjustable wrench to disconnect the supply lines from the shut-off valves, then unscrew the mounting nuts holding the faucet to the vanity top. Carefully lift the old faucet assembly out from above.
  3. Clear the Deck Completely. Scrub away old caulk, grime, and mineral deposits from the sink deck using a putty knife and a mild abrasive cleaner. The surface must be completely flat and debris-free for the new gasket to seal properly.
  4. Center the New Unit. Feed the new faucet supply lines and shank through the mounting holes on the sink. Ensure the rubber or plastic gasket is centered beneath the faucet base before it touches the sink.
  5. Lock It Down Tight. Slide the mounting washers and nuts onto the faucet shank from underneath. Tighten them firmly by hand, then give them an extra half-turn with a basin wrench until the faucet no longer wiggles.
  6. Test for Leaks Now. Thread the supply lines onto the shut-off valves and tighten the nuts firmly with your wrench. Turn the water supply back on slowly and check every joint for leaks.