How to Replace a Kitchen Faucet in Under an Hour

A kitchen faucet replacement is one of the best-value DIY plumbing projects you can take on. The job takes 30-60 minutes, requires no special skills, and saves you $200-400 in labor costs. Whether your current faucet is leaking, corroded, or you just want an upgrade, you can handle this yourself with basic tools and a free afternoon.

DIY vs. Hiring a Plumber

Before you start, here is what you are looking at cost-wise:

DIY: $100-250 for the faucet itself. That is the total cost.
Plumber: $100-250 for the faucet plus $200-400 in labor. Total: $300-650.

The faucet replacement cost drops by more than half when you do it yourself. The work is not complicated. If you can turn a wrench, you can install a faucet.

Tools You Need

Basin wrench (critical for reaching nuts under the sink — $15 at any hardware store)
Adjustable wrench
Channel-lock pliers
Plumber’s tape (Teflon tape)
Bucket and towels
Flashlight or headlamp
Penetrating oil (WD-40 or PB Blaster) for stubborn connections

Most of these are standard household tools. The basin wrench is the one specialty item you may need to buy, and it is worth every penny. Trying to reach faucet mounting nuts without one is an exercise in frustration.

Step 1: Choose the Right Replacement Faucet

Before you remove anything, buy the replacement first. You need to match your sink configuration.

Count the Holes in Your Sink

Look at your sink deck (the flat area behind the basin):

Single-hole: One hole in the center. Takes a single-handle faucet.
Three-hole: Three holes spaced 4 inches apart (centerset) or 8 inches apart (widespread). Takes a two-handle faucet or a single-handle faucet with a deck plate.
Four-hole: Three holes plus one for a side sprayer.

Key rule: You can always install a single-hole faucet on a three-hole or four-hole sink by using the included deck plate to cover the extra holes. You cannot install a three-hole faucet on a single-hole sink.

What to Look For

Finish: Brushed nickel and matte black hide water spots better than chrome.
Spout height: Make sure it clears your deepest pots. Pull-down sprayer faucets are the most versatile.
Valve type: Ceramic disc valves last the longest and rarely drip.
Supply line connections: Most modern faucets come with braided stainless steel supply lines pre-attached. This saves you a step and a potential leak point.

Stick with well-known brands like Moen, Delta, or Kohler. Their cartridges are easy to find if you ever need a repair, and their warranties are solid.

Step 2: Remove the Old Faucet

Turn Off the Water

Open the cabinet under the sink and locate the hot and cold shut-off valves on the wall. Turn both clockwise until they stop. Then open the old faucet to release any remaining pressure and drain residual water.

No shut-off valves? You will need to turn off the main water supply to the house. This is also a good time to add shut-off valves under the sink — a separate project but worth doing while everything is disconnected.

Disconnect the Supply Lines

Place the bucket under the supply line connections to catch residual water.
Use the adjustable wrench to loosen the supply line nuts where they connect to the shut-off valves.
Then disconnect the supply lines from the faucet tailpieces above. If the faucet has pre-attached supply lines, you only need to disconnect at the valve end.

Remove the Mounting Hardware

This is where the basin wrench earns its keep. Reach up behind the sink and locate the mounting nuts on the faucet tailpieces.

Fit the basin wrench onto the mounting nut.
Turn counterclockwise to loosen.
If the nuts are corroded and will not budge, spray penetrating oil and wait 10-15 minutes before trying again.
Remove all mounting nuts and any mounting plate or gasket.

Lift Out the Old Faucet

Once everything is disconnected, the old faucet lifts straight out from the top of the sink. Clean the sink deck surface of any old plumber’s putty, caulk, or mineral buildup. A plastic scraper and some white vinegar work well for this.

Step 3: Install the New Faucet

Single-Hole Installation

If your faucet comes with a rubber or plastic gasket, place it over the hole on the sink deck. If there is no gasket, apply a thin bead of plumber’s putty around the base of the faucet.
Feed the supply lines and any sprayer hose down through the hole from above.
Set the faucet in position and press it down firmly onto the gasket or putty.
From below, thread the mounting nut onto the faucet tailpiece by hand. Then tighten with the basin wrench. Snug is enough — do not overtighten or you risk cracking the sink.
Check from above that the faucet is centered and straight before fully tightening.

Three-Hole Installation

Option A — Two-handle centerset faucet:

Place the gasket or apply plumber’s putty around the base plate.
Feed the two sets of supply lines through the outer holes.
Set the faucet assembly onto the sink deck.
From below, thread and tighten mounting nuts on each tailpiece.

Option B — Single-handle faucet with deck plate:

Place the deck plate over all three holes with its gasket facing down.
Feed the faucet supply lines through the center hole of the deck plate and the sink.
Mount the faucet to the center hole as described in the single-hole instructions above.
Secure the deck plate from below if it has its own mounting hardware.

Four-Hole Installation

Follow the three-hole steps above. If you are not installing a separate side sprayer, use a sink hole cover (about $5) to cap the extra hole.

Step 4: Connect the Supply Lines

Wrap 2-3 turns of plumber’s tape clockwise around the threads on each shut-off valve.
Hand-thread the supply line connectors onto the shut-off valves.
Tighten with the adjustable wrench — a quarter turn past hand-tight is usually right. Overtightening compression fittings is the number one cause of leaks at supply connections.
If your new faucet does not have pre-attached supply lines, connect braided stainless steel lines between the faucet tailpieces and the shut-off valves. Do not use rigid chrome supply tubes unless you enjoy leaks.

Connect the Sprayer Hose

If your faucet has a pull-down or pull-out sprayer:

The sprayer hose usually connects to the faucet body with a quick-connect fitting — just push it in until it clicks.
Attach the counterweight to the hose (included with most faucets). It should hang freely inside the cabinet so the sprayer retracts smoothly.
Make sure the hose does not kink or catch on anything under the sink.

Step 5: Test for Leaks

This is the most important step. Do not skip it and do not rush it.

Remove the faucet aerator (the screen at the tip of the spout). This prevents debris from clogging it during the first run.
Slowly turn on the hot water shut-off valve. Then the cold.
Run the faucet for 30 seconds to flush out any debris in the lines.
Turn the faucet off.
Now get under the sink with your flashlight. Check every connection point: shut-off valves, supply line connections, mounting nut area, and sprayer hose connection.
Run your finger along each connection. Even a tiny drip needs attention now.
If you find a leak, tighten that connection a quarter turn. Recheck. Repeat if needed.
Reinstall the aerator.
Run hot and cold water separately, then together. Check underneath one more time.

Dry everything under the sink and lay down a paper towel under the connections. Check again in 24 hours. Some leaks only show up after the fittings settle.

Common Mistakes to Avoid

Not buying a basin wrench. Trying to use regular pliers under a sink will cost you an hour and several knuckles.
Overtightening plastic fittings. Many modern faucets use plastic mounting nuts. Crank too hard and they crack. Hand-tight plus a quarter turn is plenty.
Forgetting to flush the lines. Construction debris and old pipe scale can clog your new faucet’s cartridge on day one.
Skipping the plumber’s tape. It takes 10 seconds per connection and prevents most slow drips.
Not checking for leaks. A slow drip under the sink causes mold and cabinet damage before you notice it.

When to Call a Plumber

Handle this yourself in most cases, but call a professional if:

The shut-off valves under the sink are corroded and will not close (replacing valves involves soldering)
You find corroded or damaged pipes when you remove the old faucet
Your sink requires a non-standard configuration you cannot figure out
You are dealing with a wall-mounted faucet (these involve opening the wall)

A plumber typically charges $200-400 for a faucet installation, with the visit rarely lasting more than an hour.

Bottom Line

Replacing a kitchen faucet is a one-hour job that saves you $200-400 in labor. Get a basin wrench, match your sink hole configuration, and take your time with the connections. The hardest part is working in the cramped space under the sink — the actual plumbing is straightforward. Test every connection, check for leaks the next day, and you are done.

While you are under the sink, take a look at your supply valves and drain connections. If anything looks corroded or dated, now is the cheapest time to address it. And if your bathroom faucets are showing their age too, the process is nearly identical — check our guide on how to fix a running toilet for more bathroom plumbing you can handle yourself.