Replacing a kitchen faucet is one of the most rewarding weekend projects an American homeowner can take on. A solid mid-range faucet costs between 180 and 350 dollars at any home center, swapping it out runs about ninety minutes once you've done it a couple of times, and the upgrade transforms the most-used fixture in the house. A plumber for the same job typically charges 250 to 450 dollars in labor on top of the faucet, so the savings are real. The catch: there's one step that gets skipped in nearly every YouTube tutorial, and it's the step that determines whether your new faucet leaks under the sink in six months. Here's the complete walkthrough, written for someone who has never replaced a faucet before.
Picking the Right Faucet for Your Sink
Before buying anything, count the holes in your sink deck (or in the countertop, if the faucet mounts directly to a stone surface). This drives every other decision.
- One hole: single-handle faucet with no escutcheon plate, or single-handle with a base plate that covers up to three holes.
- Three holes, 4 inches apart (centerset): traditional two-handle faucets, or single-handle with a deck plate.
- Three holes, 8 inches apart (widespread): separate hot and cold handles plus center spout, common on older sinks.
- Four holes: three for the faucet plus one for a sprayer or soap dispenser.
Most 2026 buyers go for a single-handle pull-down model — easier to operate one-handed, fewer leak points, and the pull-down sprayer eliminates the need for the separate side sprayer that used to clog up the fourth hole.
Tools and Materials You'll Need
- Basin wrench (the long-handled tool with the pivoting jaws — there is no faucet replacement without it)
- Adjustable wrench or channel-lock pliers
- Bucket and old towel
- Flashlight or headlamp
- Plumber's tape (Teflon, white)
- Silicone caulk, kitchen and bath grade
- New supply lines (always — never reuse old ones)
- Plumber's putty or the silicone-grease gasket that comes with most modern faucets
- Safety glasses (gunk falls in your face every single time)
Total tool cost if you don't own a basin wrench: about 18 dollars. New supply lines: 12 to 18 dollars for braided stainless steel. Buy supply lines longer than you think you need — 20 inches is the right length for most installations, and a short line under tension is a future leak.
Step 1: Shut Off the Water and Drain the Lines
Under the sink, find the two shut-off valves on the hot and cold supply lines. Turn each one clockwise until firmly closed. Then turn on the kitchen faucet, both hot and cold, to release pressure and drain residual water into the sink.
If the shut-off valves are seized, leaky or non-existent (common in pre-1980 homes), you have two options: shut off the main water supply for the entire house, or replace the shut-off valves at the same time as the faucet. Most plumbers will tell you that as long as the wall is open, do the valves too. Quarter-turn ball valves run about 10 dollars each and last decades.
Step 2: Disconnect the Old Faucet
Place the bucket under the supply line connections. Use the adjustable wrench to disconnect each supply line from its shut-off valve. Some water will drip; the bucket catches it.
Now climb partially into the cabinet on your back (this is why a headlamp matters). The basin wrench reaches up to the mounting nuts that hold the faucet to the sink. Loosen each nut counterclockwise. Old nuts often fight back — corrosion, mineral buildup, the original installer overtightening 25 years ago. A spray of penetrating oil and a five-minute wait usually breaks them loose.
Lift the old faucet out from above. Wipe the sink deck clean with a rag and white vinegar — minerals build up where the old gasket sat, and the new faucet won't seal properly on a gritty surface.
Step 3: Install the New Faucet (and Here's the Step Everyone Skips)
Read the manufacturer's instructions. Almost nobody does this, and almost every kitchen faucet has a slightly different mounting system. Some use a single threaded shank with a hex nut. Others use a plastic mounting bracket with two screws. Some have a quick-connect system that snaps in from below.
The skipped step: dry-fitting the faucet before final installation. Put the faucet in place with no sealant, no plumber's tape, no glue — just set it on the sink deck, snug it up by hand, and check from below that the supply lines align with the shut-off valves, that the sprayer hose has clearance, and that nothing fouls the side of the cabinet. Roughly half of first-time installers discover at the end of the project that the supply line is two inches too short, or the sprayer hose binds against the drain pipe, and they have to disassemble everything to fix it.
Once the dry fit looks good, apply the sealant or gasket that came with the faucet (modern faucets almost never need plumber's putty anymore — read the manual), place the faucet, tighten the mounting nuts from below with the basin wrench, and snug everything up. Don't go gorilla-tight; firm hand pressure plus a quarter turn with the wrench is plenty.
Step 4: Connect the Supply Lines
Wrap two or three layers of plumber's tape clockwise around the threaded inlet ports on the bottom of the faucet. Connect the new supply lines hand-tight, then a quarter turn with the wrench. Connect the other end to the shut-off valves the same way. Always: a quarter turn past hand-tight. Overtightening crushes the rubber washers and creates leaks.
Step 5: Turn the Water Back On and Test
Open the shut-off valves slowly. Open the faucet — both hot and cold — and let it run for thirty seconds to flush out any debris from the installation. Then close the faucet and look underneath with the flashlight. Run your finger around every connection: at the shut-off valve, at the faucet inlet, around the mounting nuts. If anything is wet, give that connection another quarter turn and recheck.
Test the pull-down sprayer if you have one — pull it out, retract it, make sure the weight that keeps the hose taut isn't binding on the drain pipe or the cabinet wall.
What to Do With Plumbing Codes
Replacing a like-for-like faucet doesn't require a permit in any US municipality. Adding or moving a fixture (changing from one hole to three, for example, or routing supply lines through a wall) is a different conversation — most jurisdictions require a permit and inspection. If you're staying in the same hole count, you're fine. If you're changing the configuration, call your local building department before cutting anything.
Cost Breakdown for a Typical 2026 Install
- Mid-range single-handle pull-down faucet: 180-280 dollars
- New braided stainless supply lines (two): 14-22 dollars
- Plumber's tape, silicone, caulk: 10-15 dollars
- Basin wrench (one-time tool purchase): 14-22 dollars
- Total: about 220 to 340 dollars
Compare with a plumber install at 400-700 dollars total. The DIY save is meaningful, and the project teaches you enough about your sink plumbing to make every future repair easier.
Common Mistakes to Avoid
- Reusing old supply lines (they fail within months of being disturbed).
- Skipping the dry fit.
- Overtightening connections.
- Forgetting to flush debris before testing for leaks.
- Buying a faucet that doesn't match the hole count on your sink.
- Working without safety glasses (gunk under the sink is real, and it falls).
The Bottom Line
Replacing a kitchen faucet is one of those weekend projects that looks intimidating until you've done it once, then becomes a confident two-hour job. The dry-fit step is the difference between a smooth install and a frustrating do-over, and decent tools make the whole job easier. Pick a faucet you'll enjoy using fifty times a day, give yourself a slow Saturday morning, and you'll have one of the most-used fixtures in your house upgraded for the price of a nice dinner out.