How to Replace a Bathroom Faucet
Updated February 25, 2026
Swap an old bathroom faucet for a new one in under an hour -- centerset, widespread, and single-hole installations with supply line and drain pop-up connections.
Overview
Replacing a bathroom faucet is one of the most satisfying home upgrades -- instant visual improvement, usually under an hour. The plumbing is simple: two supply lines and a drain connection. The hard part is working in the cramped space under the sink. A basin wrench ($12-$20) makes the difference between a frustrating job and a smooth one. This guide covers all three bathroom faucet configurations: centerset (4-inch, one base plate), widespread (8-inch, three separate pieces), and single-hole.
What You'll Need
Safety First
- Turn off both hot and cold supply valves under the sink before disconnecting anything. Verify they are fully closed by opening the faucet -- no water should flow.
- Place a bucket or towel under the supply connections. Residual water in the lines drips when disconnected.
- If your shut-off valves are old gate valves that do not fully close, turn off the main house water supply before proceeding.
Step-by-Step Instructions
- Turn Off Water and Disconnect the Old Faucet
Close both supply valves under the sink. Open the faucet to release pressure. Place a bucket under the connections. Disconnect the supply lines from the faucet tailpieces using an adjustable wrench. Then disconnect the drain pop-up linkage: the horizontal rod behind the drainpipe connects to the lift rod from the faucet. Unscrew the clevis screw and slide the rod out. From under the sink, remove the mounting nuts holding the faucet to the countertop -- this is where the basin wrench earns its price.
Tip: The basin wrench is a long-handled wrench with a pivoting jaw that reaches up behind the sink basin to loosen mounting nuts in tight spaces. Without it, you are trying to reach 12-14 inches behind the basin with a regular wrench -- nearly impossible on most vanities. - Clean the Sink Surface
Lift the old faucet off the sink. Scrape old plumber's putty or silicone from the sink surface with a plastic putty knife. Clean the area with rubbing alcohol or mineral spirits. The surface needs to be clean and flat for the new faucet to seal properly. Check the sink holes: centerset faucets use three holes spaced 4 inches apart. Widespread uses three holes 8 inches apart. Single-hole uses one center hole.
Tip: If you are switching from a 4-inch centerset to a single-hole faucet, you need a deck plate to cover the unused holes. Most single-hole faucets include a deck plate in the box. If not, buy one separately ($10-$20). - Install the New Faucet
Apply a thin bead of plumber's putty or silicone under the faucet base plate (or use the rubber gasket if one is included -- most modern faucets include a gasket that eliminates the need for putty). Feed the supply lines and mounting hardware through the sink holes from above. From below, thread the mounting nuts onto the tailpieces and tighten. Centerset: one assembly, one or two mounting nuts. Widespread: three separate pieces, each mounted independently. Tighten evenly and check that the faucet is centered and straight.
Tip: For widespread faucets, install the spout first and center it. Then install the handles on each side. The interconnecting hoses between the handles and the spout run underneath -- hand-tighten these connections first, verify alignment, then snug with pliers. - Connect Supply Lines
Connect the hot supply line (left side) to the hot shut-off valve. Connect the cold supply line (right side) to the cold valve. Most modern faucets come with pre-attached braided supply lines -- just connect the other end to the shut-off valve. Hand-tight, then 1/4 turn with pliers. If the faucet does not include supply lines, buy two braided stainless steel lines ($5-$8 each) that match the thread size on both the faucet and the valve.
Tip: If the pre-attached supply lines are too short to reach the shut-off valves, buy extension hoses ($5 each) rather than forcing a connection at an angle. A stressed supply line is a future leak. - Install the Drain Pop-Up
If the new faucet includes a pop-up drain assembly, install it. Apply plumber's putty under the drain flange, press it into the sink drain hole from above. From below, thread the drain body onto the flange and tighten. Insert the horizontal pivot rod through the drain body and connect it to the vertical lift rod from the faucet with the clevis and spring clip. Test: push the lift rod down (pop-up should close), pull it up (pop-up should open). Adjust the clevis position on the horizontal rod to fine-tune.
Tip: Some modern faucets come with a push-button drain (press to close, press again to open) instead of a lift rod. These are simpler to install -- no linkage adjustment. The push-button mechanism is built into the drain body itself. - Test for Leaks
Remove the faucet aerator (unscrew from the spout tip). Turn on both supply valves slowly. Let water run for 30 seconds to flush debris from the new faucet. Check every connection: supply lines at the valves, supply lines at the faucet, drain body under the sink, and the faucet base on the countertop. Dry everything and check again after 5 minutes. No drips? Reinstall the aerator and you are done.
Tip: Running without the aerator for the first 30 seconds flushes manufacturing debris and solder flux from the faucet passages. Skipping this step can clog the aerator immediately.
Pro Tips
- A basin wrench ($12-$20) is the single most useful tool for faucet work. Buy one and keep it -- you will use it every time you touch a sink faucet. The Husky and Ridgid basin wrenches are the most popular.
- Take a photo of the old drain pop-up linkage before disconnecting it. The clevis, spring clip, and pivot rod assembly is confusing to reconnect if you did not see how it came apart.
- While the old faucet is off and you have access, replace the shut-off valves if they are old multi-turn gate valves. Swap for quarter-turn ball valves ($8-$15 each). Faster to operate and less likely to seize.
- Bathroom faucets with a 1.2 GPM flow rate are WaterSense certified and save water without noticeably reducing performance for handwashing. Check the flow rate in the specs.
- Match the faucet finish to other bathroom hardware (towel bars, toilet paper holder, shower trim). Chrome, brushed nickel, and matte black are the three most popular finishes and widely available across all brands.
When to Call a Pro
Call a plumber if the shut-off valves do not work (need replacement before faucet work), if you are converting from a centerset to widespread or vice versa (may require drilling new holes in the countertop or sink), if the supply lines are old galvanized pipes that need to be cut and adapted, or if the drain plumbing under the sink is corroded and falls apart when you touch it.
Frequently Asked Questions
When should I call a plumber to replace a bathroom faucet?
Call a plumber if the shut-off valves do not work (need replacement before faucet work), if you are converting from a centerset to widespread or vice versa (may require drilling new holes in the countertop or sink), if the supply lines are old galvanized pipes that need to be cut and adapted, or if the drain plumbing under the sink is corroded and falls apart when you touch it.
What are some expert tips to replace a bathroom faucet?
A basin wrench ($12-$20) is the single most useful tool for faucet work. Buy one and keep it -- you will use it every time you touch a sink faucet. The Husky and Ridgid basin wrenches are the most popular. Take a photo of the old drain pop-up linkage before disconnecting it. The clevis, spring clip, and pivot rod assembly is confusing to reconnect if you did not see how it came apart. While the old faucet is off and you have access, replace the shut-off valves if they are old multi-turn gate valves. Swap for quarter-turn ball valves ($8-$15 each). Faster to operate and less likely to seize. Bathroom faucets with a 1.2 GPM flow rate are WaterSense certified and save water without noticeably reducing performance for handwashing. Check the flow rate in the specs. Match the faucet finish to other bathroom hardware (towel bars, toilet paper holder, shower trim). Chrome, brushed nickel, and matte black are the three most popular finishes and widely available across all brands.
What tools do I need to replace a bathroom faucet?
You will need: Basin wrench ($12-$20 -- essential for faucet mounting nuts), Adjustable wrench or channel-lock pliers, Plumber's putty or silicone (for sealing the faucet base and drain flange), Bucket and towels (for catching residual water), Flashlight (for working under the vanity), New faucet with supply lines (check hole configuration: single, centerset, or widespread).
When should I call a professional instead of doing this myself?
Call a plumber if the shut-off valves do not work (need replacement before faucet work), if you are converting from a centerset to widespread or vice versa (may require drilling new holes in the countertop or sink), if the supply lines are old galvanized pipes that need to be cut and adapted, or if the drain plumbing under the sink is corroded and falls apart when you touch it.
How difficult is this project?
This project is rated easy. Most homeowners with basic tools can complete it.
How long does this take?
Plan for approximately 30 - 75 minutes. First-timers may need extra time.
How much will this cost?
The estimated cost is $50 - $300 for the faucet; $0 additional if DIY. Costs vary by location and materials chosen.