Hiring a plumber to replace a bathroom faucet typically costs $150 to $350 — and that is for a job that takes most professionals less than an hour. The honest truth? With basic tools and a bit of patience, most homeowners can do this themselves. This guide walks you through the entire process from start to finish. Even if you have never done plumbing work before, you can replace a bathroom faucet in a Saturday morning.
What You Will Need
Tools: Adjustable wrench or pliers, basin wrench (essential for tight spaces — see our complete tools guide), Phillips and flathead screwdrivers, needle-nose pliers, bucket or bowl, flashlight or headlamp, plumber’s tape (Teflon tape), and plumber’s putty or silicone sealant.
Estimated time: 45 to 90 minutes. Skill level: Beginner-friendly. Estimated savings: $150 to $300 compared to hiring a plumber.
Before You Start: Choosing the Right Replacement Faucet
Make sure your new faucet matches your sink’s hole configuration before buying. Measure the distance between existing holes (standard center-to-center is 4 inches for centerset or 8 inches for widespread). Check under the sink to see how many holes your sink has and count them. Your new faucet needs to match — or you will need to fill extra holes with cover plates. For detailed guidance on selecting the right faucet, read our bathroom faucet buying guide.
Step 1: Turn Off the Water Supply
Look under the bathroom sink. You will see two supply lines coming out of the wall or floor, each connecting to a shut-off valve. Turn both valves clockwise until they stop — this cuts off water to that faucet only, without affecting the rest of your home. Turn on the faucet handles to release any water pressure remaining in the lines. Let it run until it stops completely.
Important: If your shut-off valves are old and will not turn, or if they leak when you try to close them, stop here and call a plumber. Old shut-off valves can fail during this process and cause flooding.
Step 2: Disconnect the Drain Linkage
Most bathroom faucets include a pop-up drain assembly connected to the faucet by a lift rod. Before removing the faucet, you need to disconnect this. Look under the sink for a vertical rod (the lift rod) attached to a horizontal pivot rod. Squeeze the clip that holds them together and slide the lift rod free. You do not need to remove the drain stopper itself — just disconnect the linkage from the faucet body.
Step 3: Disconnect the Supply Lines
Place your bucket under the supply line connections. Even after turning off the valves, some water will remain in the lines. Using your adjustable wrench, turn the supply line nuts counterclockwise to loosen them — one at the shut-off valve, one at the faucet inlet. Remove both lines and set them aside. If the lines are old, braided, or corroded, replace them now while everything is apart. New supply lines cost $5 to $15 and it is good insurance against future leaks.
Step 4: Remove the Old Faucet
Now for the trickiest part — getting underneath the sink to remove the mounting hardware. Use your flashlight to locate the mounting nuts underneath the sink basin. Use a basin wrench to reach up into the tight space and loosen the mounting nuts counterclockwise. Once the nuts are off, lift the faucet straight up and out from above.
You may find old plumber’s putty around the base of the faucet — scrape this off completely using a putty knife. Clean the surface thoroughly so the new faucet seals properly.
Tip: A basin wrench is specifically designed for this exact job. If you do not have one, they are $15–$25 at any hardware store and make the job dramatically easier. Without one, you will be fighting the tight space under the sink for a long time. Our tools guide explains exactly what to look for when buying one.
Step 5: Install the New Faucet
Read your new faucet’s instructions briefly before starting — different models have slightly different installation sequences. Here are the general steps:
Apply sealant: Some faucets use plumber’s putty around the base; others use a gasket or require silicone. Check your manual. If using putty, roll a rope of it and press it firmly around the underside of the faucet base.
Insert the faucet: Lower the faucet through the mounting holes from above. Make sure it is aligned straight.
Secure from below: From underneath, thread on the mounting nut(s) by hand first, then tighten with the basin wrench. Tighten firmly but do not over-tighten — you can crack porcelain sinks or the faucet body.
Install the deck plate (if applicable): If your faucet includes a deck plate to cover multiple holes, install it first before mounting the faucet.
Wipe away excess putty: If you used plumber’s putty, it will squeeze out around the base. Wipe it away cleanly with your finger or a cloth.
Step 6: Connect the Supply Lines
Thread the supply lines onto the faucet inlets (hot goes to hot, cold to cold — hot is typically on the left, cold on the right). Tighten hand-tight first, then give each connection a quarter to half turn with your wrench. Do not over-tighten — supply line connections only need to be snug. Over-tightening can crack the fittings. Connect the other end of each supply line to the shut-off valve the same way. Use Teflon tape on threaded connections if they are not pre-taped — wrap it clockwise around the threads two to three times.
Step 7: Reconnect the Drain Linkage
If your new faucet includes a new drain assembly, follow the included instructions. Insert the new drain stopper into the drain opening. Thread the pivot rod through the drain body and into the back of the stopper. Secure the pivot rod with its clip. Connect the lift rod to the clevis strap, and then to the pivot rod. Test it — pushing the lift rod down should open the stopper; pulling it up should close the stopper. Adjust the clevis strap to fine-tune how far it opens and closes.
Step 8: Turn the Water Back On and Check for Leaks
Slowly turn the shut-off valves counterclockwise to restore water flow. Go slowly — do not crank them open all at once. Immediately look under the sink with your flashlight while a friend or family member runs the faucet. Check every connection point for drips: where supply lines meet the faucet inlets, where supply lines meet the shut-off valves, and around the base of the faucet. A small drip is usually fixed by tightening the connection slightly. A larger leak means the connection is not sealed properly — turn off the water, dry the fitting, and redo that connection.
Step 9: Test Everything
Run both hot and cold water fully. Check: Does hot come from the left and cold from the right? Is the pressure good? (If low, check that you removed the aerator flow restrictor if there was one installed for shipping.) Does the pop-up stopper open and close properly? Is there any leak at all? Let the water run for a full minute while watching underneath. If you see any base leaking, our faucet leak guide covers how to diagnose and fix it permanently.
Common Problems During Installation
Problem: Mounting nuts will not budge. Old faucets can have severely corroded mounting nuts. Apply penetrating oil (like WD-40) and let it sit for 20 minutes. Try again with firm, steady pressure rather than jerking the wrench.
Problem: Supply lines are too short. Buy longer ones. Do not stretch or strain supply lines — a kinked line can fail and cause flooding.
Problem: Water dribbles from the base after installation. The base gasket or plumber’s putty is not sealing fully. Tighten the mounting nut slightly more. If it persists, remove the faucet and reapply sealant.
Problem: Drain stopper does not work correctly. Adjust the clevis strap — shorten it to make the stopper close more tightly, or lengthen it to open more fully. There are adjustment holes up and down the strap for this purpose.
Frequently Asked Questions
Do I need a plumber to replace a bathroom faucet? No. Replacing a bathroom faucet is one of the most beginner-friendly plumbing jobs. As long as your shut-off valves work properly and your sink has the right hole configuration, this is a straightforward DIY project.
How long does it take to replace a bathroom faucet? For a first-timer, expect 60 to 90 minutes. Once you have done it once, the same job takes 30 to 45 minutes. The most time-consuming part is usually working in the tight space under the sink.
Can I reuse old supply lines? You can, if they are braided stainless steel and in good condition. However, since you are already doing the job, new supply lines cost $8 to $15 and give you peace of mind. Old plastic lines especially should always be replaced.
What if I do not have a basin wrench? You can sometimes manage with long-handled pliers, but it is genuinely difficult. A basin wrench costs about $20 and makes the job much easier. It is also useful for future repairs, so it is worth having in your toolkit.
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