Save Money at Home · 11 min read
The dripping started slowly — just enough to be annoying, not enough to feel urgent. For about three weeks I ignored it. Then I got my water bill and noticed it was $18 higher than the month before. A single dripping faucet can waste over 3,000 gallons of water a year, according to the EPA. That's when I stopped ignoring it and started actually dealing with it.
My first instinct was to call a plumber. Then I looked up what it costs. Around me, most plumbers quoted somewhere between $180 and $300 just for the replacement work — not counting the faucet itself. For a faucet I could buy at Home Depot for $65, that math didn't feel right.
So I did it myself. Took about an hour and a half the first time — longer than it needed to be because I didn't know a few things going in. The part that surprised me most wasn't the faucet itself. It was how awkward the whole job was. Half of it was basically lying on the bathroom floor with a flashlight, trying to reach mounting nuts I could barely see. Nobody warns you about that part.
The Short Answer
Yes, you can replace a bathroom faucet yourself. It's one of the more approachable plumbing jobs for a homeowner with basic tools. The main things that go wrong are stripped supply line connections, seized shutoff valves, and buying the wrong faucet configuration for your sink. This guide covers all three.
What You'll Need Before You Start
The faucet itself is obviously the main purchase, but the stuff that trips people up is usually what's under the sink. Old supply lines that have been in place for 15 years, shutoff valves that haven't been turned in a decade, corroded mounting nuts — these are the things that turn a 45-minute job into a 3-hour ordeal.
| Item | Purpose | Notes |
|---|---|---|
| New faucet | The replacement fixture | Match to your sink's hole configuration (1-hole, 3-hole centerset, or 3-hole widespread) |
| Basin wrench | Reaching mounting nuts behind the sink | The single most important tool — impossible to do this job without one |
| Adjustable wrench | Supply line connections | Two wrenches total is useful |
| New supply lines | Connecting faucet to shutoff valves | Replace these every time — $8–15 each at Lowe's or Home Depot |
| Plumber's tape (Teflon) | Sealing threaded connections | Wrap clockwise 2–3 times on male threads |
| Bucket and rags | Catching residual water | More water comes out than you expect |
| Flashlight or headlamp | Seeing under the sink | Saves a lot of frustration |
| Penetrating oil (e.g. PB Blaster) | Loosening corroded nuts | Apply 20–30 minutes before attempting removal on old fixtures |
Check how many holes your sink has and how far apart they are. A centerset faucet covers holes 4 inches apart. A widespread faucet covers holes 6–16 inches apart. Single-hole faucets need just one hole. Buying the wrong one means a return trip — which I did on my first attempt because I assumed without measuring.
Understanding Why Faucets Fail
Most bathroom faucets start dripping because of worn cartridges, O-rings, or ceramic disc valves inside the handle mechanism. The drip you see at the spout usually means the internal sealing component has degraded. Corrosion from hard water accelerates this significantly — if you're in a region with hard water (much of the Midwest and Southwest), faucet internals can wear out noticeably faster than they would with softer water.
The slow leak under the sink — the one you discover when you open the cabinet door and notice the wood is slightly swollen — is usually a supply line issue or a loose connection at the base of the faucet. Either way, by the time you notice visible damage, it's been going on for a while.
When the drip is coming from the base of the spout rather than the tip, that's usually the O-ring around the spout body, not the cartridge. You can replace just the O-ring in some faucets, but at that point it's often worth replacing the whole unit, especially if it's more than 10 years old and you're already under the sink.
How to Replace a Bathroom Faucet: Step by Step
Step 1: Shut Off the Water Supply
Turn off the hot and cold shutoff valves under the sink before touching anything else. They're the small oval-handled valves on the supply lines under the sink, usually chrome. Turn them clockwise until they stop.
Here's the thing about old shutoff valves: sometimes they don't fully close. You turn them all the way and water still trickles out when you disconnect the supply line. If that happens, you'll need to shut off the main water supply to the house instead. Know where your main shutoff is before you start — it's usually near the water meter or where the main line enters the house.
After shutting off, turn on the faucet to release pressure and drain any remaining water in the lines. More water will come out than you expect when you disconnect the supply lines anyway, so have the bucket ready.
Step 2: Disconnect the Supply Lines
Use an adjustable wrench to loosen the supply line nuts at both ends — the connection to the shutoff valve below and the connection to the faucet above. Counterclockwise to loosen. The top connection (at the faucet) is usually easier; the bottom connection near the valve can be tighter.
If the lines are braided stainless steel and in good shape, you could reuse them — but honestly, they're $8–15 each and replacing them removes one potential failure point. I always replace them.
Have a rag or small bucket positioned because water will drain out of both ends when you disconnect.
Step 3: Remove the Old Faucet
This is where the basin wrench earns its keep. The mounting nuts that hold the faucet to the sink are underneath, in a space too tight to reach with a regular wrench. A basin wrench has a long handle and a pivoting jaw specifically designed to reach up into that cramped area.
Turn the mounting nuts counterclockwise. On older faucets, these can be corroded and stubborn. If they won't budge, apply penetrating oil (PB Blaster works well), wait 20–30 minutes, and try again. Forcing a corroded nut with too much torque can crack a porcelain sink — not a situation you want to be in.
Once the mounting nuts are off, the faucet should lift straight out. There's usually a rubber or plastic gasket between the faucet base and the sink surface — toss it, the new faucet will come with a fresh one.
Step 4: Clean the Sink Surface
Before installing the new faucet, clean up the area around the holes. Old mineral deposits, putty residue, and corrosion ring marks should come off with a bathroom cleaner and a little elbow work. The new faucet's base plate sits here, and you want a clean contact surface.
Mine had a hard white mineral ring under the old faucet that took way longer to scrub off than I expected. Not a big deal, but worth mentioning so you don't get surprised mid-job.
Step 5: Install the New Faucet
Most modern faucets come with fairly clear instructions, and the installation process is essentially the reverse of removal. Run the supply lines and any deck plate hardware down through the sink holes, then secure with the mounting hardware from below using the basin wrench.
Hand-tighten first, then snug with the basin wrench. You don't need a lot of torque here — tight enough that the faucet doesn't wobble, but you're not trying to crush anything. Over-tightening plastic mounting hardware is a common mistake that cracks the components.
If your faucet comes with a pop-up drain assembly (most do), this gets installed at the same time. The rod from the faucet body connects to the stopper mechanism in the drain. The instructions for this vary by faucet model — follow the included guide rather than assuming it works the same as the old one.
Step 6: Connect the New Supply Lines
Wrap the male threads on the faucet inlets with 2–3 wraps of Teflon tape, going clockwise. Hand-tighten the supply lines to the faucet first, then to the shutoff valves. Snug with a wrench — about a quarter turn past hand-tight. Do not overtighten; the supply line fittings are designed to seal with just moderate pressure.
Step 7: Turn the Water Back On and Check for Leaks
Turn the shutoff valves back on slowly. Watch all the connections as the pressure returns — at the shutoff valve, along the supply line, and where the lines meet the faucet. A small drip at a connection usually means the fitting needs another quarter turn. A persistent drip usually means the Teflon tape wasn't applied correctly or the fitting wasn't threaded straight.
Let water run through the faucet for 60 seconds and check again. Get underneath with a flashlight and look carefully at everything. Don't declare victory and close the cabinet until you've checked twice.
Forcing a seized shutoff valve. If the valve under your sink hasn't been turned in years, it may not close fully — or it may crack when forced. If the valve feels stuck or won't close properly, shut off the main water supply and replace the valve before proceeding.
Buying a faucet without checking hole configuration. Centersets and widespread faucets are not interchangeable. Measure the distance between your sink holes before buying. Also check the sink deck thickness — some thick stone sinks need extended shanks.
Forgetting to disconnect the pop-up drain linkage. On faucets with a pop-up drain, there's a rod connecting the faucet body to the stopper mechanism. If you try to lift the old faucet without disconnecting this first, you'll either break the linkage or not be able to remove the faucet at all.
Cross-threading supply line connections. Supply lines thread in straight. If you feel resistance before the nut is fully seated, stop and back it off — cross-threaded connections will leak no matter how tight you get them.
Skipping the leak check. A connection that looks dry after 10 seconds may start dripping after 10 minutes under full pressure. Let it run and check again before closing the cabinet.
Single Handle vs. Two Handle: Does It Matter for DIY?
The installation process is similar for both, but there are a few practical differences. Single-handle faucets are slightly simpler because there's one cartridge to manage and one set of connections. Two-handle faucets have separate hot and cold cartridges and sometimes require more attention to the mounting configuration.
If you're replacing a two-handle faucet and want to switch to a single-handle, check whether your sink has a center hole or a deck plate that can cover the outer holes. Most widespread sink setups can accommodate either style, but it's worth confirming before you buy.
If you're going three-hole to three-hole (same configuration), it's essentially a straight swap and the process is exactly as described above.
When to Call a Plumber Instead
DIY faucet replacement is reasonable for most standard under-sink setups. The situations where it makes more sense to bring in a professional are fairly specific:
- The shutoff valves under your sink are corroded, leaking, or won't close — replacing valves involves soldering or compression fitting work that's more involved than faucet replacement
- Your supply lines are the old corrugated steel type (common in homes built before the 1990s) — these need to be replaced before anything else, and the connection types may differ from modern fittings
- The faucet you're installing requires new hole locations — drilling through porcelain or granite countertops is specialist territory
- You find water damage behind the cabinet or signs of ongoing slow leaks — the faucet may not be the only problem
What It Actually Costs: DIY vs. Professional
Here's the honest comparison for a standard bathroom faucet replacement in 2026:
| Approach | Typical Cost Range | What's Included |
|---|---|---|
| DIY | $40–$150 total | Faucet + supply lines + Teflon tape. Basin wrench is $15–25 if you don't own one — it pays for itself the first time. |
| Plumber (labor only) | $150–$300 in most areas | Labor for a standard swap. Doesn't include the faucet itself. Can run higher in major metro areas. |
| Plumber (full job) | $200–$500+ | Faucet + labor combined. Varies a lot by faucet choice and local rates. |
The DIY savings on a single faucet replacement are real — typically $130 to $250 in labor alone. For a task that takes 1–2 hours with basic tools, that's a reasonable return on your time.
Frequently Asked Questions
Q. Can I replace my bathroom faucet myself?
Yes, for most standard under-sink bathroom faucets, this is a manageable DIY project. You need a basin wrench, an adjustable wrench, new supply lines, and Teflon tape. The main things that complicate it are seized shutoff valves, corroded mounting hardware, or an unusual faucet configuration. Plan for 1–2 hours the first time.
Q. Do you have to shut off the water to replace a bathroom faucet?
Yes, always. Turn off the hot and cold shutoff valves under the sink before disconnecting anything. If those valves don't fully close, shut off the main water supply to the house. Never disconnect supply lines with the water running — the pressure will make a mess immediately and potentially damage the connections.
Q. Can you replace a tap without a plumber?
For a standard bathroom faucet replacement — same hole configuration, accessible shutoff valves, no supply line complications — yes. Where you need a plumber is if the shutoff valves are failing, you're changing hole configurations, or you discover water damage or old steel supply lines that need replacing. A plumber charges $130–$350 in labor for a standard swap.
Q. How do I replace a bathroom faucet with a pop-up drain?
Most bathroom faucets include a pop-up drain assembly. When removing the old faucet, disconnect the clevis strap and pivot rod that connects the lift rod to the stopper mechanism under the sink before lifting the faucet out. When installing the new faucet, connect the new pop-up drain hardware and then adjust the clevis strap so the stopper opens and closes fully when you pull the lift rod.
Q. How do I replace a 3-hole bathroom faucet?
A 3-hole faucet can be either a centerset (holes 4 inches apart) or widespread (holes 6–16 inches apart). Measure the distance between your holes before buying a replacement. Centerset faucets mount as one unit; widespread faucets have separate hot and cold handles that mount individually. The removal and installation process is the same as single-handle faucets, just with additional mounting points.
The Bottom Line
A bathroom faucet replacement is one of the better first plumbing projects for a homeowner. The tools required are basic, the process is logical, and the savings over professional installation are significant. The things that go wrong are usually predictable — seized valves, wrong faucet configuration, skipped leak checks — and all of them are avoidable with a little preparation.
Get the right faucet for your sink configuration, own a basin wrench, replace the supply lines while you're in there anyway, and check every connection twice before calling it done. That's most of what there is to know.
Disclaimer: Plumbing work involves risk of water damage if done incorrectly. If you're uncertain about any step, or if you encounter corroded shutoff valves, damaged supply lines, or signs of existing water damage, consult a licensed plumber. Cost estimates are based on national average data from HomeGuide, Angi, and RateYourPlumber as of 2026 and will vary by location and specific conditions.
