How to Install a Kitchen Faucet Without a Plumber

Before You Start

Installing a kitchen faucet sounds intimidating until you’re halfway through and realize it’s mostly patience and a basin wrench. You don’t need a plumber—just 60 to 90 minutes, a willingness to lie under your sink, and the tools below.

Quick note: single-handle faucets (Moen Align, Delta Essa) use one lever for hot and cold, typically needing one or two sink holes. Two-handle faucets (Kohler Bancroft, Delta Peerless two-handle) need three holes. Most modern single-handle models with a pull-down sprayer still use a three-hole deck—the sprayer hose routes through the center, and the escutcheon plate covers the rest. Know which you’re buying and check your sink’s hole count.

Tools and Materials

Snap a photo of your current setup before touching anything. That picture saves a hardware-store trip if you need a part mid-project.

Step 1: Shut Off the Water

Turn both shut-off valves under the sink clockwise until they stop. If they’re stiff, grip with a rag—don’t use a wrench on the valve body or you risk cracking it.

Turn on the faucet to relieve pressure. Water should trickle then stop. If it keeps running, your valves aren’t sealing—fix that before continuing.

Leave the faucet open while you work so residual pressure bleeds off.

Step 2: Disconnect the Supply Lines

Place your bucket under the supply line connections with a towel underneath—there’s always more water than you expect in those lines.

Unscrew the supply line nuts from the shut-off valves with your adjustable wrench, turning counterclockwise. If they’re stuck, hold the valve body steady with a second wrench so you don’t torque the pipe.

Let the water drain, then disconnect the supply lines from the faucet tailpieces above—same motion.

Toss old supply lines if they’re rigid copper or look rough. Your new faucet likely includes braided lines, and if not, 20-inch braided stainless lines ($8–$12) are far easier to work with.

Step 3: Remove the Old Faucet

This is where the basin wrench earns its keep. Get under the sink (headlamp on) and locate the mounting nuts on the faucet studs.

Loosen the mounting nuts with the basin wrench, turning counterclockwise. The jaw clicks onto the nut and gives you leverage in that tight space between the basin and cabinet wall.

Gotcha: That one stubborn nut. There’s always one. Spray with PB Blaster or WD-40, wait 10 minutes, try again. If it’s corroded and rounded off, grip with slip-joint pliers or carefully cut with a Dremel and cutting wheel. Don’t force it—cracking the sink makes a bad day worse.

Once the nuts are off, pull the faucet straight up out of the sink holes. If it’s stuck on old putty, run a putty knife around the base to break the seal.

Step 4: Clean the Sink Holes and Deck

Scrape away all the old plumber’s putty from around the holes and deck surface. A putty knife or flat-head screwdriver edge works. Get it down to bare material—leftover putty keeps the new faucet from sitting flat.

Wipe clean with a damp rag, then dry. Check that holes aren’t corroded or elongated.

Gotcha: Different hole spacing. Standard sinks have holes 4 inches on center (two-handle) or 8 inches (widespread). Most single-handle faucets include an escutcheon plate that covers any configuration. If yours doesn’t, Moen and Delta sell universal deck plates for about $10.

Step 5: Install the New Faucet

Single-Handle (Moen, Delta, Kohler, etc.)

1. Apply a thin roll of plumber’s putty around the faucet base (or escutcheon plate bottom). Some newer faucets use a rubber gasket instead—if there’s a gasket, skip the putty.
2. Feed the faucet studs and supply connections down through the sink holes. The pull-down sprayer hose goes through the center hole. Have a helper hold the faucet level from above.
3. From below, slide the mounting bracket and rubber gasket (if included) onto the center stud. Thread the mounting nut on by hand, clockwise.
4. Tighten with the basin wrench—firm hand-tight plus a quarter turn. You’re compressing the gasket, not crushing the sink. Overtightening can crack stainless or warp the bracket. About 15–20 in-lbs of torque if you measure; “snug plus a little” works fine otherwise.
5. Wipe away squeezed-out putty with a damp rag.

Two-Handle

1. Apply plumber’s putty around each handle base and the spout (or use included gaskets).
2. Drop the spout and handles into their holes—hot on the left, cold on the right.
3. Install mounting nuts from below on each piece. Hand-tighten, then snug plus a quarter turn with the basin wrench.
4. Connect handles to the spout using the included flexible connectors. Hand-tighten compression fittings, then a half turn with a wrench. Don’t overtighten—you’ll deform the ferrule and chase a slow leak for days.

Step 6: Connect the Supply Lines

Attach the flexible supply lines from faucet tailpieces to shut-off valves:

• 3/8-inch compression nut → faucet tailpiece (the threaded stub coming down)
• 1/2-inch compression nut → shut-off valve on the wall

Hand-tighten first, then a quarter to half turn with the adjustable wrench. Don’t crank on these—overtightening compression nuts is the top cause of weeping connections.

Gotcha: Hot on the left, cold on the right. It’s code and convention. Double-check before you tighten.

If valve threads look rough or you get a tiny drip, wrap 2–3 turns of Teflon tape clockwise around the valve threads before reconnecting. Teflon goes on valve threads, not compression nut threads—compression fittings seal via the ferrule.

Step 7: Check for Leaks

Turn the shut-off valves back on slowly. Don’t yank them open—gradual turns avoid hammering the lines with full pressure.

Keep the faucet open and let it run 30 seconds to flush air. Then close the faucet and inspect every connection underneath with your flashlight: supply lines at both ends, mounting nuts, faucet base.

Run a dry paper towel around each connection. Dry towel = you’re good. Damp? Tighten that nut another quarter turn and recheck.

Gotcha: A drip that won’t stop at a compression fitting usually means the ferrule isn’t seating right. Loosen, check that the brass ferrule ring is straight on the pipe, and re-tighten. If it’s deformed, cut it off with a mini tubing cutter and replace—about $1 each.

Let the water run five minutes while you keep checking. Some leaks only appear once lines are fully pressurized and warm.

Step 8: Clean Up and Test the Sprayer

If your faucet has a pull-down sprayer, test the retraction by pulling the head down and releasing. It should snap back smoothly. If it hangs, adjust the weight on the hose—slide it to about 6–8 inches below the faucet body and re-tighten its set screw.

Remove the aerator from the spout (unscrew by hand or with a gentle wrench grip wrapped in a rag), run water 30 seconds to flush debris, then reinstall. You’re done.

Common Problems and Quick Fixes

Corroded mounting nuts. Penetrating oil, wait, retry. If destroyed, cut off with a Dremel and metal cutting wheel—keep the wheel away from the sink.

Holes too far apart for the new faucet. An escutcheon deck plate bridges the gap. Most single-handle faucets from Moen, Delta, and Kohler include one; universal plates run about $10.Water hammer after installation. Turn off the main supply, open the lowest faucet in the house to drain, then turn the main back on. This recharges the air chambers.

Low water pressure. Remove the aerator and check for debris. Also verify the shut-off valves are fully open—some need several full turns counterclockwise.

Hot and cold reversed. You swapped the supply lines. Turn off water, swap, tighten. Five-minute fix.

You just saved $150–$300 in plumber fees. The hardest part was probably that one mounting nut—and you got through it. Next time, half as long.

Related guides:

• How to Fix a Leaky Kitchen Faucet
• How to Replace a Kitchen Sink Drain
• How to Install a Garbage Disposal
• How to Shut Off Water to Your Whole House