How to Replace a Bathroom Faucet
Meta description: Learn how to replace a bathroom faucet in 1 to 2 hours with this beginner-friendly step-by-step guide, tool list, costs, and leak-testing tips.
Reading time: 8 minutes
Skill level: Intermediate
Cost: $50 to $300 (faucet)
A dripping, corroded, or outdated bathroom faucet does not automatically mean calling a plumber. Most bathroom faucets can be replaced in one to two hours using basic tools. The hardest part is usually working in the tight space under the sink rather than the installation itself.
Quick answer
Replacing a bathroom faucet involves shutting off the water supply, disconnecting the old faucet and drain linkage, removing the mounting nuts, installing the new faucet, reconnecting the supply lines, and testing for leaks.
Most homeowners can complete the job in 1 to 2 hours.
Project summary
| Item | Details |
|---|---|
| Time required | 1 to 2 hours |
| Skill level | Intermediate |
| Estimated cost | $50 to $300 |
| Tools needed | Basin wrench, adjustable wrench, pliers, screwdriver |
| Parts needed | New faucet, supply lines, plumber’s putty or silicone |
Before you buy a new faucet
Choosing the correct faucet before you start can save considerable frustration.
Check the number of sinkholes
Look at the sink deck (the flat area around the drain).
- Single-hole sinks: designed for one-hole faucets.
- Three-hole sinks: commonly use centerset or widespread faucets.
Many single-hole faucets can fit three-hole sinks by using an escutcheon plate. However, a widespread faucet cannot fit a single-hole sink without modifications.
If you are unsure, take a photo of your sink before shopping.
Measure the hole spacing
Three-hole bathroom sinks usually come in two configurations:
- 4-inch centerset: handles and spout are connected on one base.
- 8-inch widespread: handles and spout are installed separately.
Check the drain size
Most bathroom sinks use a standard 1.25-inch drain opening, and most faucets include a compatible pop-up drain assembly.
Recommended bathroom faucets
| Product | Best for | Typical price |
|---|---|---|
| Delta Foundations Centerset | Budget | $50 to $80 |
| Moen Adler Centerset | Overall value | $70 to $100 |
| Delta Nicoli Widespread | Modern design | $120 to $180 |
| Kohler Forte | Premium option | $180 to $300 |
What you will need
Tools
- Basin wrench
- Adjustable wrench
- Slip-joint pliers
- Phillips screwdriver
- Flathead screwdriver
- Small bucket
- Towel
Materials
- New bathroom faucet
- New supply lines (if not included)
- Plumber’s putty or silicone sealant
The basin wrench is the one tool most homeowners do not already own. It costs around $15 to $30 and makes removing faucet mounting nuts significantly easier.
Safety note
- Turn off both hot and cold shut-off valves under the sink before beginning.
- Open the faucet afterward to relieve pressure and drain any remaining water from the lines.
- If either shut-off valve does not fully stop the water flow, shut off the main water supply before proceeding.
Step 1: Disconnect the drain linkage
Most bathroom sinks use a pop-up drain stopper connected to a lift rod.
Under the sink:
- Locate the pivot rod entering the drain pipe.
- Remove the spring clip.
- Unscrew the retaining nut.
- Pull the pivot rod free.
The drain stopper can now be lifted out from above.
Set the linkage components aside if you plan to reuse them.
Step 2: Disconnect the supply lines
Place a towel and bucket underneath the connections.
Unscrew the hot and cold supply lines from the faucet.
A small amount of water will usually spill out.
If the supply lines are old, corroded, or more than 10 years old, replace them with braided stainless steel lines.
Step 3: Remove the old faucet
This is usually the most difficult part of the project.
The faucet is secured underneath the sink using mounting nuts.
Use the basin wrench to loosen the nuts by turning counterclockwise.
Once removed:
- Remove washers and brackets.
- Lift the old faucet out from above.
Some faucets may be stuck due to old silicone or plumber’s putty. Pull firmly while rocking gently.
Clean the sink surface thoroughly before installing the new faucet.
Remove:
- Old putty
- Silicone residue
- Mineral deposits
The mounting surface should be completely clean and dry.
Step 4: Prepare the new faucet
Read the manufacturer’s instructions before assembly.
Some faucets require:
- Plumber’s putty
- Silicone only
This is particularly important because some plastic deck plates can become damaged by plumber’s putty.
If putty is recommended, roll it into a rope approximately the thickness of a pencil and apply it beneath the faucet base.
Step 5: Install the new faucet
Lower the faucet into the mounting holes.
Ensure it is centered.
From underneath:
- Install mounting brackets.
- Hand-tighten the mounting nuts.
- Alternate tightening to keep the faucet level.
- Finish tightening with the basin wrench.
Do not overtighten.
Excessive force can crack porcelain sinks or damage faucet components.
Wipe away any excess putty or silicone.
Step 6: Install the drain assembly
Most faucets include a new pop-up drain assembly.
Install the drain flange
Apply plumber’s putty around the drain flange and insert it into the sink opening.
From underneath:
- Install the gasket.
- Thread on the locknut.
- Tighten securely.
Install the stopper
Insert the stopper from above.
Feed the pivot rod into the drain body and connect it to the stopper.
Attach the clevis strap and lift rod.
Test the mechanism:
- Push down → stopper closes.
- Pull up → stopper opens.
Adjust linkage positions if necessary.
Step 7: Connect supply lines and test
Reconnect the supply lines.
Tighten:
- Hand-tight
- Plus an additional quarter turn
Slowly reopen the shut-off valves.
Before reinstalling the aerator:
- Remove the aerator.
- Turn on the faucet for 20 seconds.
- Flush debris from the lines.
- Reinstall the aerator.
This prevents sediment from clogging the new faucet.
Check carefully for leaks
Inspect:
- Faucet base: No water should appear around the deck plate.
- Supply lines: Check all threaded connections.
- Drain assembly: Fill and drain the sink several times.
- Under the cabinet: Run toilet paper around every connection. Even small leaks become obvious immediately.
Common mistakes
| Mistake | Result | Fix |
|---|---|---|
| Buying the wrong faucet configuration | Faucet does not fit | Check sink holes before purchasing |
| Overtightening mounting nuts | Cracked sink or damaged faucet | Tighten until snug only |
| Skipping putty or silicone | Water leaks beneath faucet | Seal base correctly |
| Incorrect drain linkage adjustment | Stopper does not work properly | Reposition pivot rod |
Repair costs
| Item | DIY cost | Typical plumber cost |
|---|---|---|
| Budget faucet | $50 to $100 | – |
| Mid-range faucet | $100 to $200 | – |
| Premium faucet | $200 to $400+ | – |
| New supply lines | $10 to $25 | – |
| Faucet replacement labour | – | $100 to $250 |
When to call a Plumber
Call a professional if:
- Shut-off valves will not close fully
- The drain pipe is heavily corroded
- The sink or countertop is cracked
- Water damage exists inside the cabinet
- Mounting nuts are completely seized and inaccessible
Frequently asked questions
1. Do I need to turn off the main water supply?
No. The shut-off valves under the sink are normally sufficient. However, if either shut-off valve fails, turn off the main water supply first.
2. My new faucet came with a flexible drain assembly. Is that normal?
Yes. Some manufacturers include flexible pop-up drain assemblies or simplified drain connections. Follow the installation instructions provided with your faucet.
3. Should I replace the supply lines, too?
Usually, yes. Braided stainless supply lines are inexpensive, and replacing them now reduces the chance of future leaks.
4. How long does a bathroom faucet last?
Most quality bathroom faucets last between 15 and 20 years. Hard water and poor maintenance can shorten their lifespan.
5. Why is my new faucet’s water flow weak?
Sediment from the supply lines may have clogged the aerator. Remove the aerator and flush the faucet again.
Related articles
- How to fix a leaky faucet
- How to replace a faucet cartridge
- How to fix a leaking pipe under the sink
- How to clean a faucet aerator
- How to shut off water to your house
- The complete guide to home plumbing repairs
Sources
- American Society of Plumbing Engineers (ASPE) – residential faucet installation standards
- Plumbing-Heating-Cooling Contractors Association (PHCC) – faucet replacement standards
- International Residential Code (IRC) Section P2720 – lavatory faucet installation requirements