How to Replace a Leaking Kitchen Sink Faucet

Faucet failure is often a slow creep of mineral buildup and seal degradation that eventually turns into a full-blown drip. A quality kitchen faucet is the workhorse of your home, and when it fails, the constant hum of a leak is more than just an annoyance; it is wasted water and potential cabinet damage. Replacing a faucet is a rite of passage for every homeowner, and done well, it is a straightforward mechanical swap. The secret to success is not the plumbing itself, but the access. If you clear out your under-sink cabinet completely and bring a bright headlamp, you turn a frustrating blind mission into a manageable weekend project.

  1. Stop the Water First. Close the hot and cold supply valves located under the sink by turning them clockwise. Turn on the faucet handle to release any residual water pressure and ensure the flow has stopped completely.
  2. Free the Old Lines. Use an adjustable wrench to loosen the nuts connecting the faucet supply lines to the shut-off valves. If the lines are stiff or corroded, hold the valve steady with a second wrench to prevent twisting the copper pipe inside the wall.
  3. Unbolt the Old Faucet. Reach behind the sink basin and unscrew the mounting nuts that hold the faucet to the countertop. You may need a basin wrench if the space between the sink and the wall is too tight for a standard wrench.
  4. Clear the Canvas. Pull the old faucet out from the top of the sink. Once removed, use a putty knife or a plastic scraper to remove all traces of old plumber's putty or silicone from the mounting surface.
  5. Mount the New Unit. Thread the new faucet lines through the sink holes and seat the faucet base firmly against the counter. Install the provided mounting hardware from underneath, tightening the nuts until the faucet is secure and does not shift.
  6. Pressurize and Verify. Attach the supply lines to the shut-off valves and tighten them with a wrench, taking care not to overtighten. Slowly turn the water supply back on and check for leaks at every connection before turning the faucet on.