Swapping an old, worn faucet for a new one is one of the easiest ways to freshen up a bathroom without a full renovation. Faucets last for years, but they eventually drip, stiffen up, or start to look dated.
You could call a plumber, but replacing a bathroom faucet is a very doable DIY job. With a few basic tools and some patience, you can finish in an hour or two and keep the labor money in your pocket.
This guide walks you through the whole process, from disconnecting the old hardware to flushing out your new fixture and checking every connection for leaks.
Key Takeaways
- Gather your tools first: A basin wrench, adjustable wrench, plumber’s putty or silicone, and a bucket cover most faucet swaps.
- Shut off the water before you start: Close the hot and cold shut-off valves under the sink, then open the faucet to release leftover pressure.
- Remove the P-trap and supply lines first: Clearing them out creates room to reach the faucet mounting nuts with a basin wrench.
- Flush and leak-check at the end: Run the new faucet without the aerator to clear debris, then wipe every connection with a dry tissue to catch small leaks.
Things to Consider Before You Start
Before you dive under the sink, keep these factors in mind to ensure a smooth installation:
- Replace the supply lines: Don’t try to save a few dollars by reusing old supply lines. Old lines are prone to failure and leaks. Replacing them now ensures your new setup is secure for years to come.
- Check the box contents: Many modern manufacturers, like Moen or Delta, include specialized installation tools or pre-attached supply lines. Check the packaging so you don’t buy unnecessary extras.
- Read the manual: Every brand has slight variations in their installation process. Use our guide for the core steps, but always refer to the manufacturer’s specific diagram for your model.
What You’ll Need
Being unprepared is the quickest way to turn a one-hour job into a weekend ordeal. Gather these supplies before you shut off the water:
- Basin wrench (essential for tight spaces)
- Adjustable wrench
- Old rags or towels
- Bucket (to catch water)
- Putty knife
- Plumber’s putty or silicone caulk
- New supply lines (if not included)
- Replacement faucet
How To Replace a Bathroom Faucet
Now that you have your tools and your new fixture, let’s get to work. While specific locking mechanisms vary by brand, the general process remains the same for most sinks.
Step 1: Clear the Workspace
Completely clear out the cabinet under your sink. You will be lying on your back to reach the hardware, so you need plenty of room to maneuver. Lay a towel or drop cloth on the floor to catch any drips and cushion your back.
Step 2: Turn Off the Water Supply
Locate the hot and cold water shut-off valves under the sink. Turn them clockwise until they are tight.
Once they are closed, turn on the faucet handles to drain any remaining water and pressure. If the water doesn’t stop flowing completely, your shut-off valves might be faulty and need replacing before you can proceed.
Step 3: Disconnect the P-Trap and Lines
Place a bucket directly under the pipes to catch the water trapped in the P-trap.
Disconnect the P-trap (the U-shaped pipe) by loosening the slip nuts at both ends. You can usually do this by hand, but use channel-lock pliers if they are stuck. Removing this pipe gives you much more room to work on the faucet nuts.
Next, disconnect the water supply lines from the shut-off valves using an adjustable wrench.
Step 4: Remove the Old Faucet
This is often the hardest part due to corrosion. Locate the mounting nuts holding the faucet to the underside of the sink.
Use a basin wrench to reach up and loosen these nuts. If they are seized with rust or mineral deposits, spray them with a penetrating oil like WD-40 and let it sit for 15 minutes before trying again.
Heads-up
Step 5: Remove the Drain Assembly
Locate the “clevis strap” under the sink; this is the metal bar with holes in it that connects to the drain rod. Remove the spring clip holding the rod in place and detach it.
Unscrew the large mounting nut holding the drain pipe to the sink. Push the drain tailpiece up through the sink hole to remove it. You may need to wiggle it to break the seal of the old plumber’s putty.
Step 6: Clean the Surface
With the old hardware gone, you will likely see a ring of grime, old putty, or silicone. Use a putty knife to gently scrape this away. Clean the area thoroughly with a bathroom cleaner or mineral spirits. A clean surface is vital for a watertight seal on the new faucet.
Step 7: Install the New Faucet
Most new faucets come with a plastic or rubber gasket to seal the base. If yours has a gasket, slide it on and set the faucet through the mounting holes. Skip the extra putty or silicone here, since piling sealant on top of a gasket can over-compress it and cause leaks.
If your faucet does not have a gasket, roll a rope of plumber’s putty and apply it around the base of the faucet before setting it in place. On a marble, granite, or other stone sink, use silicone instead, since plumber’s putty can stain porous stone.
From underneath, screw on the mounting nuts by hand until they touch the sink deck. Use your basin wrench or the provided installation tool to tighten them down securely. Before the final tighten, have a helper check from above to ensure the faucet is perfectly straight.
Step 8: Install the New Drain
Clean the drain hole thoroughly. If the new drain has a rubber gasket for the top flange, use it. If not, apply a ring of plumber’s putty to the underside of the drain flange and press it into the sink hole.
From below, slide on the rubber washer and the mounting nut. Tighten the nut firmly while holding the drainpipe steady so it doesn’t spin. Wipe away any excess putty that squeezes out in the sink.
Step 9: Connect the Lift Rod
Insert the lift rod through the back of the faucet. Connect it to the horizontal pivot rod using the clevis strap and screw.
Test the mechanism by pulling the lift rod up and down. The drain stopper should seal tight when the rod is pulled and open fully when pushed down. Adjust the position on the clevis strap if necessary.
Step 10: Reconnect Supply Lines
Attach your new supply lines to the faucet shanks (hot to hot, cold to cold). Then, attach the other ends to the shut-off valves.
Tighten these connections with a wrench, but be careful not to over-tighten, as this can crack the plastic nuts or damage the rubber washers inside. Hand-tight plus a quarter turn is usually sufficient.
Step 11: Reinstall the P-Trap
Reattach the P-trap to the drain tailpiece and the wall pipe. Tighten the slip nuts by hand. Ensure the connections are straight to prevent leaks.
Step 12: Flush the System
Remove the aerator from the spout of your new faucet (it usually unscrews).
Turn the water supply valves back on slowly. Check for immediate leaks. Turn on the faucet handles and let the water run for a full minute. This flushes out any manufacturing debris or sediment that could clog the aerator. Turn the water off and screw the aerator back on.
Step 13: Final Leak Check
Run the water again and inspect every connection. Use a dry tissue or paper towel to wipe around the supply lines, drain nut, and P-trap. If the tissue picks up any moisture, tighten that connection slightly and re-test.
How To Measure for Your New Faucet
Before buying a replacement, you must know what fits your sink. Here is what to look for:
Count the Holes
Look at your sink deck. Do you have one, two, or three holes?
- One hole: You need a single-hole faucet or a centerset faucet with a deck plate to cover the extra holes.
- Three holes: Measure the distance between the center of the far-left hole and the center of the far-right hole. This is your “spread.”
Measure the Spread
The most common spread sizes are:
- 4-inch spread: Requires a “centerset” or “minispread” faucet.
- 8-inch spread: Requires a “widespread” faucet.
How Much Does It Cost To Replace a Bathroom Faucet?
The price of this project depends largely on the fixture you choose. Budget-friendly brands like Glacier Bay or Project Source sell faucets in the $40 to $100 range. Mid-range options from Delta or Moen typically run $100 to $300, while premium brands like Kohler or Hansgrohe can top $500.
If you hire a pro, plumbers generally charge $45 to $150 per hour, and most faucet swaps take one to two hours, so labor alone usually lands between $130 and $350 on top of the faucet cost (1). An old faucet that is rusted or seized in place takes longer to remove and can add $15 to $100 to the bill, which is a big reason doing the job yourself saves so much.
Common Types of Bathroom Faucets
Understanding the terminology helps you buy the right fit:
- Centerset: The spout and handles are combined into a single unit. These fit standard 4-inch three-hole sinks and are very common in older homes.
- Widespread: The spout and handles are three separate pieces. These are designed for sinks with holes spaced 8 inches to 16 inches apart.
- Single-Hole: One lever controls both flow and temperature. These are sleek and modern, requiring only one hole in the sink deck.
- Wall-Mounted: Installed into the wall above the sink. These require complex plumbing behind the drywall and are best left to professionals.
- Vessel: Tall faucets designed to reach over high-rimmed vessel sinks that sit on top of the counter.
FAQs
How Long Does It Take to Replace a Bathroom Faucet?
A standard bathroom faucet replacement takes about one to two hours for a DIY installer. A rusted or seized old faucet is the usual reason it runs longer, since freeing corroded mounting nuts eats up time. Wall-mounted faucets and cramped vanities also add to the total.
Can I Replace a Bathroom Faucet Myself?
Yes, you can replace a bathroom faucet yourself, and it is one of the more beginner-friendly plumbing jobs. Most modern faucets are built for easy installation and often include the mounting hardware you need. If you can shut off the water and reach the underside of the sink, you can handle it without a plumber.
What Supplies Do I Need to Replace a Bathroom Faucet?
You need an adjustable wrench, a basin wrench for the tight space behind the sink, plumber’s putty or silicone, a small bucket, and some old towels. New supply lines are a smart add, since reusing old ones is a common source of leaks. Check the box first, as many faucet kits already include the supply lines.
Is Replacing a Bathroom Faucet Easy?
Replacing a bathroom faucet is one of the easier plumbing tasks and is beginner-friendly. The hardest part is usually removing the old, corroded faucet rather than fitting the new one. Working in the cramped space under a vanity is the main annoyance, but the actual steps are straightforward.
Are All Bathroom Faucets the Same Size?
No, bathroom faucets are not all the same size; they vary by hole count and spread. Match the new faucet to your sink’s existing setup, whether that is a single hole, a 4-inch centerset, or an 8-inch widespread. The water supply connections, though, are standard 3/8-inch compression fittings in most modern homes.
Do You Have to Use Plumber’s Putty When Replacing a Bathroom Faucet?
You do not always need plumber’s putty; if your faucet or drain comes with a rubber or plastic gasket, that gasket does the sealing on its own. Adding putty on top can over-compress the gasket and cause leaks. When no gasket is included, use putty to seal the base, but switch to silicone on marble or granite, since putty can stain the stone.
How Long Should a Bathroom Faucet Last?
A quality bathroom faucet should last about 15 to 20 years. Cheaper models with plastic internal parts often wear out closer to 10 years. Constant dripping, a stiff handle, or visible corrosion are the clearest signs it is time to replace yours.
What if the Mounting Nuts Are Stuck?
If the mounting nuts won’t budge, spray them with a penetrating oil like PB Blaster or WD-40 and let it soak for at least 15 minutes before trying again. A basin wrench gives you better leverage in the tight space. As a last resort, the nut can be cut off with an oscillating tool, but work carefully to avoid damaging the sink.
