How to Replace a Bathroom Faucet: A Complete DIY Guide

Replacing a bathroom faucet is one of the most accessible plumbing projects for homeowners. The process requires no soldering, minimal tools, and typically takes 60–90 minutes. Whether you’re dealing with a dripping faucet, upgrading for aesthetics, or installing a new vanity, this guide walks you through every step.

Before You Buy: Matching Your Faucet Configuration

Bathroom faucets come in different configurations based on how many holes they use in the sink:

• Single-hole faucets: Use one hole for the faucet body; the handle is built into the spout assembly
• Center-set faucets: Use three holes; the two handle holes are 4 inches apart (center to center), and the spout fills the gap
• Widespread faucets: Use three holes with 6–16 inches between them (measured center to center)
• Two-handle faucets: Some use two separate holes with no center spout hole

Count the holes in your existing sink and measure the spacing before purchasing a replacement.

Recommended faucets:

• The Moen Banbury Two-Handle Bathroom Faucet is a reliable center-set option with Spot Resist finish and Moen’s lifetime warranty
• For a single-handle upgrade, the Delta Arvo Single Handle Faucet is a popular choice with easy installation

Tools and Materials

• Basin wrench (essential for reaching nuts under the sink)
• Adjustable pliers
• Plumber’s putty or supplied gasket
• Teflon tape
• Bucket and towels
• Flashlight
• Penetrating oil (for corroded nuts)

Step 1: Shut Off the Water Supply

Locate the shutoff valves under the sink — one for hot, one for cold. Turn them clockwise to close. If there are no under-sink valves, shut off the main water supply to the house.

Turn the faucet on to release pressure and drain the supply lines.

Step 2: Disconnect the Supply Lines

Place a bucket or towels under the sink. Use pliers to unscrew the supply line nuts from the faucet inlets at the bottom of the faucet. Also disconnect from the shutoff valves if replacing the lines (recommended — old plastic lines crack over time; replace with braided stainless steel).

Step 3: Disconnect the Drain Linkage

Bathroom faucets typically include a pop-up drain stopper mechanism connected to a lift rod on the back of the faucet body.

1. Reach under the sink and find the pivot rod (a horizontal rod running through the drainpipe)
2. Squeeze the spring clip and pull the pivot rod out to free the stopper
3. Loosen the screw on the clevis strap and remove the lift rod from the faucet body

You can reuse the existing drain assembly or replace it with the one included with your new faucet.

Step 4: Remove the Old Faucet

Under the sink, unscrew the mounting nuts that hold the faucet to the sink deck. These are often in an awkward spot — a basin wrench makes this much easier by gripping and turning nuts in tight spaces. The Ridgid Basin Wrench is a plumber’s staple and worth owning for any sink or faucet work.

If the nuts are corroded, apply penetrating oil and wait 10 minutes before trying again.

Lift the old faucet out from above and clean any old putty or silicone from the sink surface.

Step 5: Install the New Faucet Deck Plate (if applicable)

Many center-set and widespread faucets come with a deck plate that covers multiple holes and creates a clean look for sinks with more holes than the faucet uses.

Apply plumber’s putty around the underside edge of the deck plate (or use the supplied rubber gasket — check your faucet instructions) and press it onto the sink.

Step 6: Install the New Faucet

1. Feed the water supply tubes and lift rod through the center hole in the sink
2. Press the faucet body down onto the sink, over the deck plate if used
3. From below, slide on any mounting hardware (varies by brand)
4. Hand-tighten the mounting nut(s), then snug with pliers or the basin wrench — do not overtighten on porcelain

Step 7: Connect the Supply Lines

Attach new braided stainless steel supply lines to the faucet inlets and to the shutoff valves. Hand-tighten, then snug with pliers (¼ turn past hand-tight). Don’t use Teflon tape on compression fittings, but do use it if the connection uses threaded male NPT fittings.

Step 8: Reconnect the Drain Stopper

Install or reconnect the pop-up drain assembly:

1. Insert the pivot rod into the drainpipe and thread it into the stopper ball
2. Connect the clevis strap to the lift rod
3. Adjust the clevis strap position so the stopper opens and closes fully when the lift rod is raised and lowered
4. Tighten the set screw on the clevis

Step 9: Test Everything

Turn the shutoff valves back on slowly. Let the lines fill and check:

• All supply line connections for drips
• Under the faucet body for sealing
• The drain stopper for proper operation
• Both hot and cold water flow from the faucet
• The aerator for full, even flow (remove and clean it if the flow is reduced after installation — debris often dislodges during installation)

Common Issues After Installation

• Drip from supply line connection: Tighten an additional ¼ turn
• Water spraying from aerator: Remove and clean the aerator screen
• Stopper won’t stay up: Adjust the clevis strap to a higher hole
• Faucet handle tight or stiff: Check for debris in the cartridge; the cartridge may have been installed incorrectly

Conclusion

Replacing a bathroom faucet takes most homeowners about 90 minutes on the first attempt. The most physically challenging part is reaching the mounting nuts under the sink — a basin wrench makes that manageable. With the right faucet for your sink’s configuration and a methodical approach, you’ll have a leak-free installation and a refreshed bathroom sink.