Miles SinclairBy Miles Sinclair

Updated November 2026

Installing a kitchen sink faucet is a manageable weekend job if you work methodically. In this guide, you will shut off the water, remove the old faucet, mount the new one, connect the supply lines and test for leaks. Most homeowners can finish the job in about two hours with a few basic tools.

Before You Start: Prepare the Sink and Gather Tools

Check that your new faucet matches your sink’s hole configuration. Single-hole sinks take one-handle faucets, while three-hole sinks may need a deck plate or a faucet with a matching spread. If you are unsure how many holes you have, How to Measure Your Sink and Space for a New Faucet walks through the measurements.

Shopping for one? See our guide: 5 Best Faucets for Kitchen Sink Options Compared for Every Need (2026).

Gather these tools and supplies before you begin:

  • Adjustable wrench and basin wrench
  • Plumber’s putty or a silicone gasket, depending on the faucet
  • Bucket and old towels
  • Flashlight
  • Braided supply lines, if the new faucet does not include them
  • Plumber’s tape (PTFE tape)

How to Install Kitchen Sink Faucet Parts Step by Step

Step 1: Shut Off the Water and Remove the Old Faucet

Close the hot and cold shutoff valves under the sink, then open the faucet to drain remaining water. Disconnect the supply lines with a wrench, keeping a bucket underneath. Loosen the mounting nuts on the underside of the sink using a basin wrench, then lift the old faucet out.

Step 2: Clean the Mounting Surface

Scrape off old putty or gasket residue and wipe the sink deck dry. A clean surface helps the new seal grip evenly and prevents leaks around the base.

Mounting the New Faucet and Connecting Supply Lines

Set the new faucet in place, applying a bead of plumber’s putty or position the gasket as the manufacturer directs. Tighten the mounting nuts from below, working evenly so the faucet sits straight. Do not overtighten, since this can crack the sink or deform the gasket.

Wrap the threads of each supply line with PTFE tape in a clockwise direction, then connect them to the faucet tails and the shutoff valves. Hand-tighten first, then add a quarter to half turn with a wrench. Plastic compression fittings need less torque than brass ones.

Testing and Final Checks

  1. Open both shutoff valves slowly to avoid a sudden pressure surge.
  2. Run the faucet on hot and cold separately for about a minute each.
  3. Check every connection with a dry paper towel. Any moisture means the fitting needs another eighth-turn.
  4. Look at the base of the faucet for leaks after five minutes of running water.

If the faucet drips after installation, the cartridge or valve seat may be the cause. Moen Kitchen Faucet Dripping: 6 Causes and How to Fix Each One covers the most common culprits.

Common Mistakes and Tips

  • Skipping the shutoff valve test. Old valves sometimes fail, so check that water stops before you disconnect anything.
  • Overtightening nuts under the sink, which can crack porcelain or stainless steel.
  • Forgetting to flush the supply lines. Open the valves briefly into the bucket to clear debris before connecting the faucet.
  • Using too much plumber’s putty. Excess squeezes out and can clog the drain or stain the finish.
  • Mixing up hot and cold lines. Most faucets label them, but double-check before turning on the water.
  • Basin wrench: Reaches the mounting nuts in tight spaces under the sink, which saves a lot of frustration. View on Amazon
  • PTFE thread seal tape: Creates a reliable seal on threaded connections and is easy to apply. View on Amazon
  • Braided stainless supply lines: Give a sturdier, more durable connection than basic rubber hoses. View on Amazon

FAQ

Can I install a kitchen sink faucet without a plumber?

Yes, most homeowners can handle the job with basic hand tools. If you find corroded shutoff valves or damaged supply lines, consult a licensed plumber before continuing.

How long does it take to install a kitchen sink faucet?

A first-time installer typically needs about two hours, including removing the old faucet and testing for leaks. Experienced DIYers can often finish faster.

Do I need plumber’s putty for every faucet?

No. Many modern faucets use a rubber gasket or foam seal instead. Check the manufacturer’s instructions to see which sealing method applies.

Conclusion

With the water off and the right tools on hand, installing a kitchen sink faucet comes down to careful mounting and clean connections. Test every joint before you consider the job finished. If something feels wrong or the valves will not shut off, pause and consult a professional plumber.

Ready to choose one?

Miles Sinclair

About Miles Sinclair

Miles Sinclair is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.