Posted by Dogberry Collections
on May 12, 2026
Quick Answer: Replacing a bathroom faucet is a beginner-friendly plumbing project that takes 30 to 60 minutes. You do not need a plumber. You need an adjustable wrench, plumber's putty or silicone sealant, and a bucket. Turn off the water supply valves, disconnect the old faucet, drop in the new one, connect the supply lines, and test for leaks.
Swapping out a dated faucet for a new bathroom faucet is one of the highest-impact, lowest-cost bathroom upgrades you can make. Here is a complete step-by-step walkthrough.
Before You Start: Check the Hole Configuration
Bathroom sinks come with different hole configurations. Before buying a new faucet, look underneath your sink and count the pre-drilled holes:
- 1 hole: You need a single-hole faucet
- 3 holes, 4-inch spread: You need a centerset faucet
- 3 holes, 8-inch spread: You need a widespread faucet
You can also use a 3-hole sink with a single-hole faucet by adding a deck plate (escutcheon) that covers the unused holes. Most single-hole faucets include this option.
Tools and Materials Needed
- Adjustable wrench or basin wrench (a basin wrench makes tight spots much easier)
- Bucket or towels to catch water
- Plumber's putty or silicone sealant (check your faucet instructions - some specify one or the other)
- Teflon tape (for threaded connections)
- The new faucet and its included hardware
Step 1: Turn Off the Water Supply
Look under the sink for two shut-off valves on the supply lines - one hot, one cold. Turn both clockwise until they stop. Then turn on the faucet to release pressure and confirm the water is off. Keep a bucket under the P-trap in case residual water drips.
Step 2: Disconnect the Supply Lines
Using an adjustable wrench, loosen the nuts connecting the supply lines to the faucet. These are typically located just above the shut-off valves. Have your bucket ready - some water will drain out. Once disconnected, set the supply lines aside (you may be able to reuse them if they are in good condition, or replace them with braided stainless lines if they are old plastic or corrugated).
Step 3: Remove the Old Faucet
From under the sink, locate the mounting nut or nuts holding the faucet to the sink deck. Loosen and remove them. If they are corroded and stuck, apply a penetrating lubricant and wait 10 minutes before trying again. Once the nuts are removed, lift the old faucet out from above. Clean any old putty, sealant, or mineral deposits from the sink surface before installing the new faucet.
Step 4: Install the New Faucet
Follow the instructions included with your faucet - each model varies slightly. Generally:
- Apply plumber's putty or silicone under the faucet base (or deck plate if included) unless the faucet has a pre-installed gasket
- Lower the faucet into the sink holes from above
- From below, thread on the mounting nut and tighten by hand, then snug with a wrench - do not overtighten
- Wipe away any excess putty that squeezed out around the base
Step 5: Connect the Supply Lines
Connect the hot supply line to the hot inlet (usually marked H or on the left) and cold to cold. Hand-tighten first, then give a quarter turn with the wrench. Wrap the threads with Teflon tape before connecting if using compression fittings. Do not overtighten - supply line connections just need to be snug, not cranked down hard.
Step 6: Test for Leaks
Turn the shut-off valves back on slowly. Turn on the faucet and let it run for a minute. Check every connection point under the sink - the supply line connections at the valve and at the faucet, and the area around the faucet base on top of the sink. Dry each connection point and check again after a minute. A slight drip from a supply line connection can usually be fixed by a small additional tightening.
Replacing the Drain Stopper
Most new faucets come with a matching pop-up drain assembly. If yours does, this is a good time to swap out the old drain stopper as well. It connects to the faucet's lift rod via a pivot rod assembly under the sink. Instructions are included with the faucet and the swap typically adds only 15 minutes to the project.
Browse Dogberry Collections' bathroom faucets in single-hole, centerset, and widespread configurations - available in brushed nickel, matte black, oil-rubbed bronze, and chrome finishes. Call us at (435) 923-4100 if you have questions about what fits your sink.
