How to Replace a Kitchen Faucet

🧰 Tools & Materials

• Adjustable wrench
• Basin wrench
• Phillips and flathead screwdrivers
• Bucket
• Towels or rags
• Flashlight or work light
• Plumber’s putty or silicone sealant, if required by the faucet manufacturer
• New kitchen faucet
• New supply lines, if they are not included with the faucet
• Penetrating oil, if the old mounting hardware is corroded

Signs It’s Time to Replace Your Kitchen Faucet

A kitchen faucet can last for years, but eventually repairs may stop making sense. Consider replacing yours if:

• The faucet leaks around the base, handle, or spout
• The finish is badly corroded, peeling, or stained
• The faucet feels loose even after tightening
• Water pressure remains poor after cleaning the aerator
• The pull-down or pull-out sprayer no longer works correctly
• Replacement cartridges or parts are difficult to find
• You simply want to upgrade the appearance or functionality of your sink

Before You Buy

Before choosing a new faucet, look underneath your kitchen sink and determine how many mounting holes your sink or countertop has. Kitchen sinks commonly have one, three, or four holes.

A single-handle faucet may only require one hole, while other configurations may use additional holes for handles, a side sprayer, soap dispenser, or accessories.

If your new faucet requires fewer holes than your sink has, a deck plate or separate hole cover can usually cover the unused openings.

Also check:

• The faucet will fit your existing sink configuration
• The spout height works with cabinets or windows above the sink
• The spout reach properly covers the sink basin
• Hot and cold supply connections are compatible
• Included supply lines are long enough to reach your shutoff valves
• There is enough room underneath the sink for mounting hardware and pull-down hose weights

💡 Pro Tip: Take a picture underneath the sink before shopping. It gives you a quick reference for the existing mounting setup, supply lines, and available space.

Step 1: Clear Out the Cabinet

Remove everything from underneath the kitchen sink so you have as much working room as possible.

Place a bucket and a few towels underneath the faucet connections. Even after shutting off the water, the supply lines will contain some water.

Use a flashlight or work light so you can clearly see the mounting hardware behind the sink basin.

What You Should See: Two water supply lines running from the faucet to the hot and cold shutoff valves, along with mounting hardware securing the faucet to the sink or countertop.

Step 2: Shut Off the Water

Turn the hot and cold shutoff valves clockwise until they are completely closed.

Turn on the kitchen faucet and let the water run until it stops. Try both hot and cold positions to make sure both supplies are shut off.

If water continues flowing, stop before disconnecting the supply lines.

💡 Pro Tip: If a shutoff valve has not been used in years, turn it slowly. Forcing a stuck valve can damage it and create a much bigger plumbing project.

Step 3: Disconnect the Water Supply Lines

Place the bucket directly underneath the connections.

Use an adjustable wrench to disconnect the hot and cold supply lines from the shutoff valves. Depending on your faucet, you may instead find it easier to disconnect the lines at the faucet connections.

Allow any remaining water to drain into the bucket.

If you plan to reuse existing supply lines, inspect them carefully. Replace lines that show corrosion, damaged fittings, cracking, or excessive wear.

What You Should See: Both faucet supply lines should now be completely disconnected from the home’s water supply.

Step 4: Disconnect the Sprayer Hose

If your faucet has a pull-down or pull-out sprayer, locate the hose connection underneath the sink.

Most modern faucets use a quick-connect fitting, threaded connection, or retaining clip.

Disconnect the hose according to the faucet design and remove the hose weight if it prevents the faucet from being removed.

If Yours Looks Different: Do not pry apart an unfamiliar plastic connector. Some quick-connect fittings require you to press tabs or remove a small retaining clip before they release.

Step 5: Remove the Faucet Mounting Hardware

Look directly underneath the faucet for the nuts, brackets, or mounting plate securing it to the sink.

Use a basin wrench or adjustable wrench to loosen the mounting nuts.

Older hardware may be difficult to remove because of corrosion or mineral buildup. Apply penetrating oil and allow it to sit before trying again.

Once everything is loose, remove the mounting hardware.

💡 Pro Tip: A basin wrench can make this step dramatically easier when the mounting nuts are tucked tightly behind the sink basin.

Step 6: Remove the Old Faucet

From above the sink, gently lift the old faucet upward.

Feed the supply lines and sprayer hose through the mounting hole as you remove it.

If the faucet is stuck to the sink, carefully work around the base to break loose old plumber’s putty, silicone, or mineral buildup. Do not aggressively pry against the sink surface.

Once removed, scrape away the old sealant and thoroughly clean the mounting area.

What You Should See: A clean mounting surface with the faucet holes completely exposed.

Step 7: Install the New Faucet

Follow the manufacturer’s instructions for any gasket, deck plate, plumber’s putty, or silicone required underneath the faucet.

Feed the new faucet’s supply lines and hoses through the appropriate mounting hole and lower the faucet into position.

Make sure the faucet is facing straight toward the sink before securing it underneath.

Some faucets include a rubber or plastic gasket and do not require plumber’s putty or silicone, so follow the instructions included with your faucet.

Step 8: Secure the Faucet Under the Sink

From underneath the sink, install the supplied washer, mounting bracket, and mounting nut.

Hold the faucet straight from above while tightening the mounting hardware underneath.

Tighten it enough that the faucet cannot rotate or move at the base, but avoid overtightening the hardware.

Check the faucet alignment one more time before making the final tightening adjustment.

What You Should See: The faucet should sit flat against the sink or countertop and remain firmly in position when you gently move the handle or spout.

Step 9: Connect the Supply Lines and Sprayer

Connect the hot supply line to the hot shutoff valve and the cold supply line to the cold valve.

Start threaded connections by hand to avoid cross-threading them. Once hand-tight, use a wrench to snug the connections according to the manufacturer’s instructions.

Reconnect the pull-down or pull-out sprayer hose and reinstall the hose weight in the recommended location.

Make sure the sprayer hose can move freely without catching on plumbing, the garbage disposal, or items underneath the sink.

💡 Pro Tip: Do not overtighten supply-line connections. Excessive force can damage washers, fittings, or shutoff valves and actually cause leaks.

Step 10: Turn the Water Back On and Check for Leaks

Make sure the faucet handle is in the off position.

Slowly open the cold water shutoff valve, followed by the hot water valve.

Watch every connection underneath the sink as the system repressurizes.

Use a dry paper towel around each connection to check for moisture. Even a tiny leak will show up quickly.

If you find a drip, shut the water back off and inspect the connection before tightening anything further.

Step 11: Flush and Test the Faucet

Remove the faucet aerator if the manufacturer recommends doing so before the initial flush.

Turn on the faucet and allow both the hot and cold water to run for 30-60 seconds. This helps flush debris that may have entered the lines during installation.

Reinstall the aerator and test:

• Hot and cold water
• Faucet handle movement
• Pull-down or pull-out sprayer
• Spray settings
• Hose retraction
• Spout rotation

Check underneath the sink one final time for leaks.

💡 Pro Tip: Check underneath the sink again later that day and the following morning. A very slow leak may not be obvious immediately after installation.

If Something Goes Wrong

Water Won’t Shut Off Completely

If water continues flowing after closing a shutoff valve, do not disconnect the supply line. The valve may have failed internally.

Shut off the home’s main water supply before continuing and consider replacing the faulty shutoff valve.

Old Faucet Won’t Come Loose

Corroded mounting nuts are common on older faucets. Apply penetrating oil and give it time to work.

A basin wrench can provide better access and leverage.

If the nut is severely corroded, additional removal methods may be necessary, but avoid damaging the sink or countertop while cutting or breaking old hardware.

New Faucet Is Loose

Check that the mounting bracket and washer underneath the sink are positioned correctly.

Have someone hold the faucet straight from above while you tighten the mounting nut underneath.

If the sink surface is thin, make sure any stabilizing plate supplied with the faucet has been installed.

Supply Connection Is Dripping

Turn the water off and inspect the connection.

Make sure the fitting is threaded straight and the sealing washer inside the supply line is properly seated.

Do not automatically add thread seal tape. Many faucet supply connections seal with an internal rubber washer rather than the threads.

Pull-Down Hose Doesn’t Retract

Check the hose underneath the sink.

Make sure the weight is installed in the correct position and the hose is not catching on the P-trap, garbage disposal, shutoff valves, or stored items.

Water Pressure Is Low After Installation

Remove and clean the faucet aerator.

Small pieces of sediment can break loose when the water supply is turned back on and become trapped inside the aerator.

Also confirm that both shutoff valves are fully open and the supply lines are not kinked.

🛑 Common Mistakes to Avoid

• Forgetting to completely shut off both water supply valves
• Buying a faucet that does not match the sink’s mounting-hole configuration
• Reusing old or damaged supply lines
• Cross-threading supply connections
• Overtightening fittings
• Using plumber’s putty when the manufacturer specifies a gasket or silicone
• Installing the faucet slightly crooked before tightening it
• Forgetting to install or correctly position the pull-down hose weight
• Failing to check every connection for leaks
• Stuffing items back underneath the sink before confirming everything is dry

❓ FAQs

Can I replace a kitchen faucet myself?

Yes. For many homeowners, replacing a kitchen faucet is a manageable DIY plumbing project. The most difficult part is often reaching and removing the old mounting hardware underneath the sink.

Do I need a plumber to install a kitchen faucet?

Not usually. If your shutoff valves work properly and the existing plumbing is in good condition, most kitchen faucet replacements can be completed with basic hand tools.

Do I need plumber’s putty when installing a kitchen faucet?

Not always. Many modern faucets use a rubber or foam gasket underneath the faucet or deck plate. Follow the faucet manufacturer’s instructions rather than automatically adding plumber’s putty.

Should I replace the supply lines when replacing the faucet?

If the new faucet includes integrated supply lines, use those. If it does not, replacing older supply lines is usually worthwhile, especially if the existing lines show corrosion, wear, or damaged fittings.

Why is my new kitchen faucet leaking underneath the sink?

The most common causes are a loose connection, cross-threaded fitting, improperly seated washer, or connection that was overtightened. Turn off the water and inspect the exact source of the leak before making adjustments.

How tight should faucet supply lines be?

Thread them on by hand first and then snug them according to the manufacturer’s instructions. They should be secure, not excessively tight. Overtightening can damage the sealing washer or fitting.

How long does it take to replace a kitchen faucet?

Most replacements take about 45–90 minutes. An older faucet with corroded mounting hardware can take longer.

📞 When to Call a Professional

Consider calling a plumber if:

• The shutoff valves will not completely stop the water
• A shutoff valve begins leaking while you are working
• Supply pipes or fittings are heavily corroded
• You discover damaged plumbing underneath the sink
• The faucet mounting hardware cannot be safely removed
• Connections continue leaking after being properly reassembled
• The installation requires plumbing modifications beyond a straightforward faucet replacement

A faucet replacement is usually beginner-friendly, but damaged shutoff valves or deteriorated plumbing can quickly turn it into a larger repair.

Related DIY Guides

• How to Replace a Bathroom Faucet
• How to Replace a Kitchen Sink
• How to Replace a Garbage Disposal
• How to Replace a Kitchen Sink Drain
• How to Replace a Toilet Shut-Off Valve