Water dripping onto the cabinet floor is the first sign a faucet has quit. Most work happens on your back, headlamp on, arms folded into a cabinet — read the whole sequence before loosening anything, because order matters more than muscle. Below is the full sequence, the tools that reach the mounting nuts, and the two mistakes that cause a first-run leak.
How Do You Replace A Bathroom Faucet: The Step Order
Cut the water, drain the lines, unfasten the old assembly from underneath, then reverse those steps with the new fixture. Home Depot’s replacement walkthrough lays out the sequence:
- Shut off the hot- and cold-water supply valves beneath the sink. If none exist — or they’re frozen — turn off the main supply.
- Open the faucet handle to release trapped pressure.
- Slide a bucket, pan, or rags under the work area.
- Disconnect the hot and cold supply lines.
- Unscrew the mounting nuts holding the faucet body to the sink. An adjustable wrench or basin wrench handles hard-to-reach nuts.
- Disconnect the lift rod from the drain linkage.
- Pull the old faucet assembly up and out from the top of the sink.
Before touching a nut, confirm the main valve holds. Crack the faucet open after shutting the supply — if water keeps running, the shut-off is passing and the main has to go off.
Tools And Layout Considerations
An adjustable wrench covers most of the job, but a basin wrench saves a stubborn install, because standard wrenches often can’t reach mounting nuts at the back of the sink bowl.
Faucet style changes what you face under the sink. Home Depot’s materials separate single-handle, center-set, and widespread layouts, and mounting hardware and drain linkage steps shift by model. Widespread faucets often have separate supply connections for each handle. Once the old faucet is out, scrape away sealant or gasket material and wipe the sink surface around the faucet holes with rubbing alcohol or all-purpose cleaner — a clean mating surface lets the new gasket seat properly.
| Stage | What To Do | Tool Needed |
|---|---|---|
| Cut water | Close hot and cold supply valves; main supply if none exist | Hand |
| Release pressure | Open the faucet handle; bucket or rags underneath | Bucket or rags |
| Disconnect lines | Detach hot and cold supply lines from the faucet | Adjustable wrench |
| Free the body | Unscrew mounting nuts beneath the sink | Basin wrench |
| Drain linkage | Disconnect the lift rod from the drain | Hand or pliers |
| Remove fixture | Lift the old faucet assembly up from the sink | Hand |
| Prep surface | Scrape old sealant; wipe with rubbing alcohol or cleaner | Rags |
| Seat new faucet | Center the fixture; apply putty or silicone only if instructions call for it | Manufacturer’s instructions |
If you haven’t chosen the fixture yet, our roundup of the best bathroom faucet replacement options breaks down finishes, spout reach, and handle layouts.
Installing The New Faucet And Testing For Leaks
Follow the new faucet’s printed instructions, centering it before tightening, then restore water slowly and run a full leak check. Sealant use and supply-line attachment vary by model, so manufacturer paperwork outranks generic advice. Home Depot’s install guide spells out the closing sequence: assemble per instructions and apply plumber’s putty or silicone caulk only if called for; center the faucet before tightening; attach supply lines; turn water back on; remove the aerator; run water one minute; check every connection for leaks.
Over-tightening is a documented risk — tighten securely, not with everything you’ve got, because a crushed washer or cracked fitting leaks worse than a snug one. The second is rushing the flush: that one-minute run with the aerator off pushes debris out before it clogs the new cartridge.
Watch supply connections at both ends — valve and faucet. Dry both with a rag, wait a few minutes, then run a fingertip along each fitting. Any dampness means a retighten, not a replacement. On center-set or single-handle models, check the handle swings smoothly through hot and cold without grinding; if it grinds, the cartridge likely isn’t seated all the way. Before calling it done, lay a dry paper towel under each connection overnight. A morning damp spot is a five-minute fix; a puddle means reseating the washer — cheaper than a swollen cabinet floor.
FAQs
Do I need a basin wrench for this job?
Not always, but have one on hand. Mounting nuts at the back of the sink bowl sit too deep for most standard wrenches, and a basin wrench reaches them from below without removing the sink. On open, easy-access mounts an adjustable wrench works fine.
How do I shut the water off if there are no valves under the sink?
Turn off the main water supply for the house. Home Depot’s install guide notes the main supply is the fallback when no shut-off valves exist beneath the sink. Then open the faucet to drain remaining pressure before disconnecting any line.
Can I reuse the old supply lines?
Usually it’s better to replace them. Supply lines are inexpensive, and their rubber seals harden with age — often the real source of the drip that started this project.
References & Sources
- Home Depot. “How to Replace a Bathroom Faucet.” Source for the replacement sequence, difficulty rating, and tool recommendations.
- Home Depot. “How To Install a Bathroom Faucet.” Source for the install sequence, sealant guidance, and leak-check steps.
- Lowes. “Faucet Installation Guide.” Manufacturer installation guide supporting tightening and supply-line guidance.
