Introduction
Is your bathroom faucet leaky, outdated, or just plain dull? Swapping it out for a new one is easier than you might think. This guide on how to install a new bathroom faucet walks you through each step — from removing the old fixture to installing the new one — using simple tools and a bit of DIY confidence. With a fresh faucet, you can instantly modernize your sink and improve water flow in under an hour.
Why Installing a New Bathroom Faucet Matters
Bathroom faucets don’t last forever. Over time, they can corrode, leak, clog, or just stop working efficiently. Replacing your old faucet improves water pressure, reduces drips (and your water bill), and freshens up the entire look of your vanity.
Whether you want to switch to a more water-efficient model, match new fixtures, or just give your bathroom a facelift, installing a new faucet is a high-impact, budget-friendly upgrade that doesn’t require a plumber.
Step-by-Step Guide to Installing a Bathroom Faucet
1. Gather Your Tools and Supplies
Before starting, make sure you have everything on hand:
- New bathroom faucet set (with drain assembly, if included)
- Basin wrench or adjustable wrench
- Bucket or bowl
- Towels or rags
- Plumber’s tape (Teflon tape)
- Silicone sealant or plumber’s putty (if required)
- Screwdriver (Phillips or flathead)
- Flashlight or headlamp (for better visibility under the sink)
Bathroom Tip: Double-check your faucet configuration — centerset, widespread, or single-hole — and make sure your new faucet matches your sink’s design.
2. Turn Off the Water Supply
Look under your sink for the shut-off valves connected to the hot and cold water lines. Turn each valve clockwise until it stops.
Once shut off, turn on the faucet to relieve any remaining water pressure and to confirm the water is off.
Pro Tip: Place a bucket or bowl under the sink to catch any water that may drip during removal.
3. Disconnect the Water Supply Lines
Using an adjustable wrench, carefully loosen the nuts connecting the supply lines to the faucet’s underside. You may also need to disconnect the drain rod assembly (lift rod) if your old faucet has one.
Use a towel to absorb any water that spills during this process.
4. Remove the Old Faucet
- From underneath the sink, locate and loosen the mounting nuts securing the faucet to the sink or countertop.
- Use a basin wrench to reach tight spots, especially if the space is cramped.
- Once loosened, lift the old faucet out from the top.
Clean the sink area where the old faucet sat to remove any grime or residue before installing the new one.
Bathroom Tip: If your new faucet includes a drain assembly, remove the old one now (see drain replacement below).
5. Install the New Faucet
Follow the manufacturer’s instructions for your specific faucet model, but here’s the general process:
- Apply sealant – If required, apply a bead of plumber’s putty or silicone around the base of the new faucet to prevent leaks.
- Insert faucet – Position the faucet through the mounting holes on the sink or vanity top.
- Secure from underneath – Under the sink, screw on the mounting nuts to hold the faucet in place. Tighten with your hands, then snug them with a wrench — but don’t overtighten.
- Wipe away excess sealant – If putty or silicone oozes out, wipe it clean with a damp cloth.
6. Connect the Water Supply Lines
Reconnect the hot and cold water lines to the faucet stems using your adjustable wrench. Wrap plumber’s tape around the threads before tightening to ensure a leak-free connection.
Make sure to match the hot (left) and cold (right) correctly.
Efficient Tip: If your old supply lines are worn or corroded, consider replacing them during this project.
7. Install or Replace the Drain Assembly (If Included)
If your new faucet came with a matching drain:
- Remove the old drain by unscrewing the locknut underneath the sink.
- Apply plumber’s putty around the underside of the new drain flange.
- Insert the new drain from above, then tighten the gasket and locknut underneath.
- Connect the drain tailpiece to your P-trap (curved pipe).
- Attach the lift rod to the drain lever if your faucet includes one.
Pro Tip: Check that the stopper opens and closes smoothly before tightening everything.
8. Turn the Water Back On and Test
Slowly open both shut-off valves under the sink. Turn on the new faucet and let the water run for 30–60 seconds to flush out debris and test the flow.
Check for leaks around:
- Supply line connections
- Faucet base
- Drain assembly
Tighten any fittings slightly if needed.
Common Mistakes to Avoid
Avoid these typical DIY errors:
- Mistake: Not matching the faucet to your sink type
Solution: Confirm whether your sink is designed for centerset, widespread, or single-hole faucets before buying. - Mistake: Forgetting plumber’s tape
Solution: Use tape on threaded connections to prevent leaks and ensure a tight fit. - Mistake: Overtightening connections
Solution: Tighten fittings just enough — too much pressure can crack fittings or strip threads. - Mistake: Skipping the cleanup step
Solution: Always remove old putty, corrosion, or buildup before installing a new fixture. - Mistake: Not checking for leaks before finishing
Solution: Test all connections with water running before closing up your workspace.
Extra Tips & Bathroom Hacks
- Use a flashlight to improve visibility under tight sinks.
- Apply silicone sealant around the faucet base instead of plumber’s putty if working on a porous or stone countertop.
- Upgrade your aerator — some new faucets have removable aerators you can swap for water-saving versions.
- Clean the aerator regularly to maintain good water pressure and prevent buildup.
👉 Need more bathroom upgrades? Check out our guide on how to replace a showerhead for a quick companion project!
Conclusion
Installing a new bathroom faucet is one of the most rewarding DIY upgrades you can do in under an hour. With just a few tools, a bit of patience, and this guide, you can enjoy better water flow, a modern look, and the satisfaction of a job well done — all without hiring a pro.
Bookmark this guide so you’ll always have a step-by-step reference for future faucet replacements or sink repairs.