Replacing a kitchen or bathroom faucet is one of the highest-impact, lowest-cost upgrades you can make to a home — and contrary to popular belief, it is a job most homeowners can complete themselves in under an hour with basic tools. A dated, corroded faucet drags down the entire look of a sink area; a new premium fixture with a PVD finish instantly modernizes the space and solves chronic drip problems at the same time.
This guide walks you through a complete faucet swap, from preparation to final leak check, with the specific steps that save time and prevent the mistakes DIYers most often make.
1. Before You Start: Tools and Supplies
Gather everything before turning off any water. Stopping mid-job to find a tool is how 30-minute projects become all-day projects.
Tools:
- Adjustable basin wrench (the single most important tool — its long handle reaches the nuts up under the sink that a regular wrench cannot)
- Adjustable crescent wrench
- Channel-lock pliers
- Phillips and flathead screwdrivers
- Utility knife (to cut old caulk or supply lines)
- LED headlamp or flashlight
- Small bucket and towels (for residual water)
Supplies:
- Your new faucet (confirm it matches your sink’s number of mounting holes)
- New braided stainless-steel supply lines (do not reuse 10-year-old lines — they fail)
- Plumber’s tape (Teflon tape)
- Silicone caulk or the gasket included with your faucet
- Penetrating oil (in case old nuts are corroded)
Matching tip: Count your sink’s pre-drilled mounting holes before buying. A single-hole faucet will not fit a 3-hole sink without an escutcheon plate, and an 8-inch widespread faucet needs three holes.
2. Step 1 — Shut Off the Water (2 minutes)
1. Locate the shut-off valves under the sink (one for hot, one for cold). Turn both clockwise until they stop.
2. If there are no under-sink valves, shut off the main water supply to the house.
3. Open the faucet handle to release residual pressure and let the remaining water drain out. Leave it open for the duration of the job.
3. Step 2 — Disconnect the Supply Lines (3 minutes)
1. Place a bucket under the supply line connections.
2. Use the adjustable wrench to loosen the nut connecting each supply line to the faucet’s tailpiece (the vertical tubes coming down from the faucet).
3. Detach the supply lines from the shut-off valves as well if you are replacing them (recommended).
4. Expect a small splash of water — that is normal.
4. Step 3 — Remove the Old Faucet (5 minutes)
1. Climb under the sink and locate the mounting nuts securing the faucet’s tailpieces to the sink deck. There will be one per tailpiece.
2. Use the basin wrench to loosen and remove these nuts. The basin wrench’s jaw flips to grip from either direction — use the angle that lets you turn counterclockwise.
3. If a nut is corroded and won’t budge, spray penetrating oil, wait 5 minutes, and retry. Forcing it can crack a porcelain sink.
4. If there is a sprayer hose connected, disconnect it from the faucet body.
5. Lift the old faucet straight up and out of the sink. Scrape away any old putty or caulk with the utility knife and clean the sink surface thoroughly — a flat razor blade works well on stainless steel.
5. Step 4 — Prepare the New Faucet (5 minutes)
1. Thread the supply lines into the new faucet’s tailpieces from below (some faucets come with integrated lines — in that case, skip this). Hand-tighten, then give a quarter-turn with a wrench. Do not overtighten or you will crack the fitting.
2. Apply plumber’s tape clockwise onto any threaded connections (this ensures the tape winds tighter, not looser, as you tighten the nut).
3. If your faucet uses a rubber gasket, press it onto the base. If it requires silicone, run a thin, continuous bead around the base — wipe any squeeze-out immediately.
4. Feed the tailpieces and supply lines down through the sink mounting hole(s).
6. Step 5 — Mount and Secure the New Faucet (7 minutes)
1. From below, slide on any provided washers and mounting nuts onto each tailpiece.
2. Hand-tighten the nuts, then use the basin wrench to snug them down. Alternate between nuts if there are two or more — this keeps the faucet seated level rather than tilting.
3. Tighten until the faucet is firm and does not rock. Do not overtighten — you can crack a stone or porcelain sink.
4. Wipe away any silicone that squeezed out around the base with a damp cloth.
7. Step 6 — Connect the Supply Lines (3 minutes)
1. Connect the hot supply line to the hot valve (usually left, marked red) and the cold to the cold (right, marked blue). Connecting them backwards means your handle’s hot/cold labels will be reversed.
2. Tighten the nuts hand-tight, then a quarter-turn with a wrench. Again, do not overtighten — the rubber washers inside the flexible lines do the sealing.
8. Step 7 — Test for Leaks (5 minutes)
1. Remove the aerator from the new faucet’s spout. This prevents any debris knocked loose during installation from clogging it. (See our faucet cleaning guide for the safe aerator-soak method.)
2. Make sure the faucet handle is in the closed/off position.
3. Turn the shut-off valves back on — open them slowly.
4. Open the faucet and let both hot and cold run for 60 seconds to flush the lines.
5. Inspect every connection under the sink with a flashlight and a dry paper towel. Wipe each joint, then check the towel for moisture. A joint that looks dry but leaves a wet streak on the towel is weeping and needs a small additional tighten.
9. Common Pitfalls and How to Avoid Them
| Problem | Cause | Fix / Prevention |
|---|---|---|
| Leak at supply line nut | Nut undertightened or cross-threaded | Disconnect, check threads, re-tighten to quarter-turn past hand-tight |
| Faucet rocks or tilts | Mounting nuts uneven | Alternate tightening; re-seat the gasket |
| Handle hot/cold reversed | Supply lines swapped | Swap the lines at the valves |
| Low flow after install | Debris in aerator | Remove aerator and flush (done in Step 7) |
| Persistent drip from spout | Cartridge shipping plug not removed | Some cartridges ship with a protective cap — check the install sheet |
10. When to Call a Pro Instead
This is a DIY-friendly job, but call a plumber if:
- The shut-off valves are seized or leaking — replacing valves means opening the wall.
- The sink is cast iron or fragile stone and the old faucet is corroded in place — you risk cracking the basin.
- You discover galvanized supply pipes instead of flexible lines — these are a sign of older plumbing that deserves a professional assessment.
Conclusion
Swapping an old, dripping faucet for a premium fixture is one of the most satisfying DIY upgrades you can make — a brand-new PVD-finished faucet (learn why the finish matters in our PVD guide) with a smooth ceramic disc valve (see Faucet Valve Types: Ceramic vs. Brass) will transform both the look and the function of your sink for decades.
If you are ready to choose your replacement, browse our curated Kitchen Sink Faucets and Bathroom Sink Faucets collections, or contact our team with your sink’s hole configuration and we will recommend the perfect fit.