How to Replace Sink Faucet in Kitchen: A Step-by-Step Guide (2026)

By Lauren Holland

Updated November 2026

Replacing a kitchen faucet is one of the more manageable plumbing jobs you can do yourself. Knowing how to replace sink faucet in kitchen setups comes down to shutting off water, disconnecting the old unit, seating the new one, and reconnecting the supply lines. Most homeowners can finish in an afternoon with basic hand tools.

Before You Start: Check Your Sink and Faucet Setup

Look under the sink before you buy or remove anything. Count the mounting holes on the sink deck, because a single-hole, three-hole, or four-hole faucet only fits if the new unit matches your existing layout. Also note whether the old faucet mounts from above or below the counter, since that affects how you reach the nuts. If you are unsure which style you need, Kitchen Faucet with Pullout Spray: How to Choose the Right One (2026) walks through the common configurations.

Shopping for one? See our guide: 6 Best Kitchen Sink Faucet Moen Models for Every Need (2026).

How to Replace a Kitchen Sink Faucet, Step by Step

Start by closing the hot and cold shutoff valves under the sink. Then open the faucet to drain remaining water and relieve pressure. Place a towel and a shallow bucket below the work area, since small amounts of water will still drip from the supply lines.

Disconnect the Old Supply Lines

Loosen the supply line nuts with an adjustable wrench or basin wrench, holding the valve body steady so you do not twist the pipes. Once the lines are free, unscrew the mounting nuts or clips that hold the faucet to the sink or countertop. Lift the old faucet out and clean any old plumber’s putty or gasket residue from the deck.

Set and Connect the New Faucet

Place the new faucet base over the holes, following the manufacturer’s gasket or sealing instructions. Tighten the mounting nuts from below evenly so the faucet sits level and does not rock. Connect the new supply lines to the shutoff valves, hand-tightening first and then using a wrench for a snug fit. Some owners wrap the threads with plumber’s tape, while others rely on the included washers, so follow the product instructions.

Test and Finish the Installation

Open the shutoff valves slowly, one at a time, and check each connection for drips. Turn on the faucet and let hot and cold water run for about a minute to flush debris from the new lines. Then inspect the base and connections again once the system is under normal pressure. If a joint seeps, tighten it a quarter turn at a time rather than forcing it.

Step	Tool or Check
Shut off water	Hot and cold stop valves
Remove old faucet	Adjustable or basin wrench
Mount new faucet	Mounting nuts and gasket
Connect supply lines	Wrench and plumber’s tape if specified
Test	Run water and check for leaks

Recommended gear

Basin wrench: It reaches mounting nuts in tight spaces under the sink, which is where most frustration happens. View on Amazon
Plumber’s tape: Wrapping threads helps prevent drips at threaded connections when the instructions call for it. View on Amazon
Bucket and towels: They catch residual water when lines are disconnected. View on Amazon

Common Mistakes and Tips

Skipping the shutoff valves and assuming the faucet will drain on its own.
Overtightening plastic or compression fittings, which can crack or deform washers.
Buying a faucet with the wrong hole count for your sink deck.
Forgetting to flush the new lines before judging whether the faucet works.
Reusing old gaskets or washers when the new faucet includes fresh ones.

FAQ

Do I need a plumber to replace a kitchen sink faucet?

Many homeowners handle the job themselves if the shutoff valves work and the sink has standard connections. If valves are corroded or the sink is damaged, consult a licensed plumber.

How long does it take to replace a kitchen faucet?

Most people finish in one to three hours, depending on access under the sink and how stubborn the old nuts are.

What if the shutoff valves do not close fully?

Stop and call a plumber before proceeding, since you may need to shut off water at the main supply. A valve that will not close should be replaced by a professional.

Conclusion

Knowing how to replace sink faucet in kitchen installations is mostly about preparation: confirm your hole count, shut off the water, and take your time with the connections. Work methodically, test for leaks, and you will have a new faucet working in an afternoon. For model-specific help, How to Replace a Kitchen Sink Faucet: A Step-by-Step Guide (2026) offers extra detail.

Ready to choose one?

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our kitchen & bathroom fixtures guides, checking product details against manufacturer specifications and owner feedback.

About the author

Lauren Holland

Lauren Holland writes reviews and buying guides for Kitchen Bath Channel.