How to Replace a Bathroom Faucet: A Step-by-Step Guide for Beginners

Updated November 2026

Replacing a bathroom faucet is a manageable weekend project for most homeowners. You will shut off the water, disconnect the old fixture, mount the new one and test for leaks. With basic hand tools and a careful approach, the whole job usually fits into two to four hours, depending on how stubborn the old connections are.

Check Your Faucet Type and Sink Setup

Before you buy anything, confirm how many holes your sink has and how the faucet mounts. A single-hole faucet fits one opening, a centerset spans three holes with a small gap, and a widespread model uses three separate pieces. Measure the distance between the mounting holes, usually 4 inches for a centerset, and check whether your sink has a pop-up drain or a separate drain assembly.

Shopping for one? See our guide: 7 Best Replace Bathroom Sink Faucets (2026): Our Picks.

Also look under the sink. Most faucets connect to two supply lines, one hot and one cold, via shutoff valves. If those valves are corroded or do not close fully, plan to replace them too. Our guide to Bathroom Faucet Repair Kits: How to Fix a Leaky Faucet in 6 Steps covers common internal problems, which can help you decide whether a replacement is the better path.

Remove the Old Bathroom Faucet

Step 1: Shut off the water

Turn the shutoff valves under the sink clockwise until they stop. Then open the faucet to drain remaining water and relieve pressure. Keep a towel and bucket nearby, since some water will still drip from the lines.

Step 2: Disconnect the supply lines

Place a bucket under the connections and use an adjustable wrench or basin wrench to loosen the nuts. The basin wrench reaches the tight nuts at the back of the sink that a regular wrench cannot.

Step 3: Remove the mounting hardware

Under the sink, unscrew the mounting nuts or release the clips that hold the faucet base to the sink deck. Lift the old faucet out through the top. If the old unit is stuck from years of sealant, cut the caulk around the base with a utility knife before pulling.

Clean the mounting surface thoroughly. Remove old putty, caulk and mineral buildup so the new base sits flat.

Install the New Bathroom Faucet

Follow the manufacturer’s instructions, since mounting methods differ between brands. Most installers do the following:

1. Place the gasket or sealing pad on the base of the new faucet, according to the packaging.
2. Feed the supply lines and any pop-up drain parts through the sink holes.
3. Set the faucet on the deck and tighten the mounting nuts or clips from below, snugging them evenly rather than cranking one side.
4. Connect the supply lines to the shutoff valves, hand-tightening first and then giving each nut a quarter turn with a wrench.
5. Install the drain assembly, using plumber’s putty or the gasket supplied if the manufacturer calls for it.

Avoid overtightening plastic nuts or compression fittings, which can crack or strip threads.

Test for Leaks and Finish the Job

Slowly open the shutoff valves, then run the faucet on hot and cold for about a minute each. Check every connection, including the supply lines, the drain and the base, for drips. If you find a small seep, tighten the fitting slightly. For a persistent drip, shut the water off and check whether the washer or seal is seated correctly.

Once the connections are dry, wipe the surfaces and let any caulk cure as directed on the tube before heavy use.

Common Mistakes to Avoid

• Skipping the shutoff check. Confirm the water is off before you disconnect anything.
• Buying a faucet that does not match your hole count or spacing. Measure before shopping.
• Reusing old supply lines that are brittle or discolored. New flexible lines are inexpensive insurance.
• Overtightening compression nuts, which can crack the fitting.
• Forgetting to flush the new lines briefly, which can clear debris that would clog the aerator.

Recommended Gear

• A basin wrench is useful for reaching the tight mounting nuts behind the sink. View on Amazon
• Braided stainless steel supply lines are a common upgrade because they resist bursting better than vinyl lines. View on Amazon
• Plumber’s putty seals the drain flange and is easy to remove later. View on Amazon

FAQ

Do I need a plumber to replace a bathroom faucet?

Many homeowners handle the job with basic tools, provided the shutoff valves work and the sink is in good condition. If the valves are seized or the sink or pipes are damaged, consult a licensed plumber.

How long does a bathroom faucet replacement take?

Most first-timers finish in two to four hours. Older, corroded connections can add time, so allow extra for stubborn nuts.

What if the water does not shut off under the sink?

If the shutoff valves fail, you may need to close the main water supply to the house before continuing. Call a plumber if you cannot shut off the water safely.

Conclusion

Replacing a bathroom faucet comes down to shutting off the water, removing the old fixture carefully and mounting the new one with secure, leak-free connections. Measure your sink first, and take your time with the nuts and seals. With those steps done, your bathroom will have a fresh, working faucet.

Related reading

• Replace Cartridge in Moen Bathroom Faucet: 6 Best Picks Compared (2026)
• Replace Bathroom Tub Faucet: A Step-by-Step Guide for Beginners
• Price Pfister Bathroom Faucet Parts: Identify, Order and Replace the Right Ones

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