How to Replace a Kitchen Faucet — Complete Step-by-Step Guide

Learn how to replace a kitchen faucet yourself in about two hours — from turning off the water and disconnecting supply lines to securing the new faucet and testing for leaks.

Replacing a kitchen faucet is one of the highest-impact DIY upgrades you can make. A modern faucet with a pull-down sprayer, better reach, and a sleek finish can transform how your kitchen works. And when the old one starts dripping, sticking, or looking dated, you don’t have to call a plumber — you can swap it yourself in about two hours.

The job is straightforward if you follow the right sequence. The mistakes happen when people skip prep, cross-thread supply lines, or forget to check the deck plate. Let’s walk through it so your new faucet goes in clean on the first try.

What You’ll Need

Tools:

• Basin wrench (or offset screwdriver — a basin wrench is worth buying for this job)
• Adjustable wrench (two, if you have them)
• Bucket and old towel
• Flashlight or work light
• Plumber’s putty (for most standard baseplate installs — check manufacturer instructions)
• Teflon tape (for threaded connections)

Materials:

• New kitchen faucet (verify it fits your sink deck configuration — 1-hole, 3-hole, or 4-hole)
• Supply lines (check compatibility with your shut-off valve type)
• Sprayer deck plate/trim ring if switching from 1-hole to 3-hole or vice versa

Step 1: Turn Off the Water and Relieve Pressure

Locate the shut-off valves under the sink — there should be one for hot and one for cold. Turn both clockwise until they stop. If the valves are old or stuck, go to the main water shut-off for the house.

Open the existing faucet handle all the way to confirm water has stopped. Then open it in the opposite direction (if it’s a single-handle model) to release any pressure trapped in the line.

Step 2: Disconnect the Supply Lines

Place your bucket under the connections. Use your adjustable wrench to loosen the coupling nuts connecting the supply lines to the shut-off valves. Expect some residual water to drip out — that’s normal.

Once the supply lines are free from the shut-off valves, unscrew them from the faucet tailpieces (the threaded posts coming down from the faucet body). Set the supply lines aside.

Step 3: Remove the Old Faucet

This is where the basin wrench earns its keep. Reach up under the sink and locate the mounting nuts holding the faucet base to the sink deck. These are usually large plastic or brass nuts threaded onto the faucet tailpieces.

Use the basin wrench to loosen and remove these nuts. The offset handle lets you reach the nuts when a standard wrench can’t fit.

Once all mounting nuts are off, push the faucet up and out from above. Clean the sink deck area thoroughly — old putty, grime, and mineral deposits will prevent a good seal on the new faucet.

Step 4: Install the New Faucet Base and Gasket

Most new faucets come with a foam gasket that sits between the faucet base and the sink deck. This replaces the need for plumber’s putty on the top side. If your faucet includes one, stick it to the bottom of the faucet base.

For faucets without a gasket, roll a thin bead of plumber’s putty around the sink deck hole and press the base into it.

Feed the supply lines and any pull-down sprayer hose through the sink deck hole from above. If your sink has 3 holes and your faucet uses only 1, install the deck plate (escutcheon) first.

Step 5: Tighten the Mounting Hardware from Below

From under the sink, slide the mounting plate and nuts up onto the faucet tailpieces. Hand-tighten first, then use your basin wrench to snug them down. Do not overtighten — you’re sealing against the gasket or putty, and plastic mounting nuts can crack under too much force.

If your faucet has a separate “C” bracket that slides over the tailpieces before the nuts, make sure it’s oriented correctly. Some designs require the bracket to sit flush against the underside of the sink deck.

Step 6: Connect the Supply Lines

Attach the new supply lines to the faucet tailpieces first, then connect the other ends to the shut-off valves. Most modern faucets use braided stainless steel supply lines with pre-attached nuts — just hand-tighten, then give each nut a quarter-turn with a wrench.

If you’re reusing old supply lines (not recommended), wrap the threaded ends with Teflon tape in a clockwise direction, two to three wraps.

Step 7: Connect the Pull-Down Sprayer (If Applicable)

If your new faucet has a pull-down sprayer:

1. Attach the sprayer hose to the faucet body — this connection lives in the faucet’s base, under the sink
2. Slide the sprayer weight onto the hose (position it about halfway or where the manufacturer specifies)
3. Feed the sprayer head into the faucet body from above until it clicks into place

The sprayer weight slides freely on the hose so it drops back into place by gravity. Make sure the hose isn’t kinked or caught on anything in the cabinet.

Step 8: Test for Leaks

Turn the cold water shut-off valve on slowly. Check every connection for drips — supply line nuts, faucet tailpiece connections, and the sprayer base connection. Repeat with the hot water.

Once both are on and dry, open the faucet and let it run for 30 seconds. Check under the sink again. Then close the faucet and recheck.

When to Call a Pro

Some situations call for a plumber. Call one if:

• The shut-off valves won’t close and you can’t access the main valve
• The sink deck is cracked or rotted around the old faucet holes
• You need to drill new holes in a granite or quartz countertop (this requires a diamond core bit and professional experience)
• Old mounting hardware is rusted solid and won’t break loose
• You don’t have access underneath the sink (e.g., a built-in cabinet with a fixed bottom shelf)

The Bottom Line

Replacing a kitchen faucet is a two-hour, one-wrench project that saves $150–$300 in plumber fees. The most common failure points — stuck shut-off valves, missing deck plates, and overtightened nuts — are all preventable with the prep steps listed here.

Take your time on Step 1. Verify the water is off. Verify the new faucet fits your sink deck. The actual installation is just plumbing LEGOs if you’ve set yourself up right.

Target keywords: replace kitchen faucet, install kitchen faucet, kitchen faucet installation, how to replace kitchen faucet, DIY faucet replacement, pull-down faucet installation, kitchen sink faucet replacement.

Long-tail patterns: “how to replace a kitchen faucet with pull down sprayer”, “replace kitchen faucet single handle”, “kitchen faucet installation no plumber”, “replace kitchen faucet shut off valve won’t close”, “deck plate for 3 hole sink with single hole faucet”.