A dripping kitchen faucet can waste water, leave mineral stains in the sink, and make an otherwise quiet kitchen surprisingly annoying. Replacing it is often a manageable DIY job, even if you’ve never worked under a sink before—as long as you choose a compatible faucet, shut off the water properly, and take your time with the connections.
The trickiest part is usually not installing the new faucet. It’s getting comfortable access to the old one, where the mounting nuts may be cramped, rusty, or hard to see. Here’s how to replace a kitchen faucet step by step, what tools to gather, and how to spot the problems that are better handled by a plumber.
Table of Contents
Before You Start: Check That the New Faucet Will Fit
Kitchen faucets aren’t all mounted the same way. Before buying one, look at the holes in your sink or countertop and compare them with the faucet’s installation requirements. A mismatch can mean extra work or a faucet that simply won’t fit.
Count the holes and measure the space behind the sink. Many sinks have one, two, three, or four holes. A single-handle faucet may use one hole, while a faucet with separate handles or a side sprayer may need more. Some faucets include a deck plate, also called an escutcheon, that covers unused holes, but it won’t work with every sink layout.
| What to check | Why it matters |
|---|---|
| Number and spacing of sink holes | The faucet must match the existing holes or include a suitable plate to cover them. |
| Space behind and below the sink | A tall handle, pull-down hose, or bulky mounting hardware may not fit in a tight area. |
| Supply-line connections | The faucet hoses need to connect to your shutoff valves, sometimes with compatible adapters. |
| Sink or countertop thickness | Some mounting hardware has limits on how thick a surface it can secure. |
It also helps to check whether the new faucet comes with supply hoses and a gasket. Don’t assume it does. Read the installation instructions before you begin; faucet designs vary, and the manufacturer’s directions take priority over general advice.
Tools and Supplies You’ll Need
Gather everything first. Once you’re wedged under the sink, stopping to hunt for a wrench gets old quickly. Most standard replacements call for:
- Adjustable wrench or open-end wrenches
- Basin wrench for reaching mounting nuts in tight spaces
- Screwdriver, if the faucet hardware requires one
- Bucket or shallow pan
- Towels or rags
- Flashlight or headlamp
- Putty knife or plastic scraper, if you need to remove old sealant
- Plumber’s putty or silicone sealant, only if the faucet instructions call for it
- New faucet and compatible supply hoses, if they aren’t included
A basin wrench is especially useful because its long handle and swiveling jaw can reach the nuts holding the faucet to the sink. You may be able to do the job without one, but a standard wrench often can’t fit into the narrow space behind the basin.
How to Replace a Kitchen Faucet
1. Clear the cabinet and protect the area
Remove cleaning supplies, trash bins, and anything else under the sink. Put a towel in the cabinet and place a bucket beneath the shutoff valves. A little water will remain in the hoses even after you turn the supply off, so the bucket prevents an avoidable mess.
Keep a phone nearby if you want to take photos of the existing connections. A quick picture can help you remember which hose connected to the hot-water valve and which connected to the cold-water valve.
2. Shut off the hot and cold water
Look for two shutoff valves under the sink: one for hot water and one for cold. Turn each handle clockwise until it stops, without forcing it. Then open the faucet handles to release pressure and drain water left in the lines.
If there are no shutoff valves, or a valve won’t close, stop before loosening any connections. You may need to shut off the home’s main water supply or have a plumber repair the valve first. A partly working valve can let water keep flowing while you’re trying to remove the faucet.
3. Disconnect the old faucet’s supply lines
With the bucket in place, use a wrench to loosen the connections where the faucet hoses meet the shutoff valves. Turn carefully and support the valve if needed; twisting or stressing old plumbing can damage it. Let any trapped water drain into the bucket.
Make a note of which line is hot and which is cold. If the supply hoses are badly corroded, kinked, or cracked, replace them rather than reusing them. Flexible hoses should not be stretched tight or bent sharply when installed.
4. Remove the old faucet
Reach behind the sink and find the mounting nuts or bracket that hold the faucet in place. Loosen them with a basin wrench or the tool specified in the faucet instructions. If the hardware is stuck, apply steady pressure rather than yanking on the faucet or plumbing.
Once the mounting hardware is off, lift the faucet and its hoses out from above. If it won’t budge, check for a remaining clip, nut, or sealant. Forcing it can scratch the sink or damage a countertop surface.
Some old faucets have a separate sprayer hose or weight underneath. Disconnect those parts as well, and note how they were routed before removing them.
5. Clean the sink surface
Scrape away old putty or sealant with a plastic scraper or putty knife, taking care not to gouge the sink. Wipe the area clean and dry it. A smooth, clean surface helps the new gasket sit flat and reduces the chance of water seeping beneath the faucet base.
Check the sink around the mounting holes. If the metal is badly corroded, the countertop is cracked, or the holes are damaged, a new faucet may not seal or secure properly. That’s a good point to pause and get advice before installing it.
6. Fit the new faucet and secure it
Read the faucet’s instructions to see whether the gasket goes on the faucet, the sink, or both. Some models require sealant; others use a built-in gasket and specifically warn against adding putty. Follow the directions rather than applying sealant automatically, since the wrong material can interfere with a gasket or stain certain surfaces.
Feed the faucet hoses through the correct sink hole or holes. From underneath, install the mounting washer, bracket, and nut in the order shown in the instructions. Tighten the hardware until the faucet feels secure and sits straight, but don’t overtighten. Too much force can damage the sink, threads, or faucet base.
If your faucet uses a deck plate, make sure it sits flat and covers the unused holes before tightening the faucet. Check the handle’s movement and the faucet’s alignment from above while you still have room to adjust it.
7. Connect the hoses and any sprayer
Attach the hot and cold supply lines to their matching shutoff valves. Many faucet hoses are marked or color-coded, but check the manual rather than relying on color alone. Tighten each connection as directed. Some fittings seal with a washer and should not be wrapped with thread-seal tape; adding tape where it isn’t needed can prevent the fitting from sealing correctly.
If the faucet has a pull-down or side-sprayer hose, connect it using the supplied fittings and clip. Make sure the hose moves freely and won’t snag on the cabinet, cleaning products, or drain pipes. For a pull-down faucet, the counterweight needs enough clear space to move as the hose extends and retracts.
8. Turn the water on slowly and check for leaks
Close the faucet handles, then slowly turn the hot and cold shutoff valves counterclockwise. Look closely at every connection underneath the sink while the lines pressurize. If you see a drip, shut off the water and check that the fitting is aligned and tightened according to the instructions.
Run both hot and cold water for a few minutes. This helps flush air and loose debris from the lines. If the faucet has an aerator, the small screen at the spout, the manufacturer may recommend removing it while flushing and cleaning it before putting it back. Follow the faucet directions for that step.
Finally, test the sprayer and pull-down hose. Look underneath again after using them, then check the cabinet a few hours later. A slow leak can take time to show up, especially if it only happens when the faucet is running.
Common Problems and What to Do
- A shutoff valve won’t turn: Don’t force a stiff or corroded valve. It may break or start leaking. Shut off the main supply if you know how to do so safely, then arrange for the valve to be repaired or replaced.
- The old mounting nut won’t loosen: Improve your view with a flashlight and make sure you’re turning the right part. A basin wrench can help. If the nut is severely rusted or the plumbing shifts when you apply force, stop before causing damage.
- The new faucet wobbles: Check that the faucet is centered and that the mounting bracket and nut are installed in the correct order. Tighten evenly, but don’t crank down on the sink.
- A hose connection drips: Turn off the water, dry the connection, and inspect the washer or fitting. A cross-threaded, missing, or damaged washer is a common cause. Reconnect it straight and follow the manufacturer’s tightening instructions.
- Hot and cold are reversed: Turn off the water and check that each supply line is connected to the correct valve. Some faucets also have cartridge or handle settings described in the manual.
When It’s Better to Call a Plumber
Replacing the faucet is a reasonable DIY project when the shutoff valves work, the pipes are in good shape, and the new faucet fits the existing sink. Call a plumber if you find active leaks, badly corroded pipes, a broken shutoff valve, damaged sink mounting holes, or connections that don’t match and can’t be adapted safely.
It’s also sensible to get help if you can’t identify the home’s main shutoff, the plumbing moves when you loosen a fitting, or you’re unsure whether a connection is sealed correctly. One careful service call can cost less than repairing water damage from a rushed installation.
Read more related posts:
- How to unclog a sink drain Without Harsh Chemicals
- 10 DIY fixes for a leaking bathroom faucet actually work
- 10 ways to unclog a bathroom drain without harsh chemicals work
Frequently Asked Questions
How long does it take to replace a kitchen faucet?
A straightforward replacement may take a couple of hours, but the time varies. Tight cabinet space, corroded mounting hardware, or incompatible connections can add a lot of work.
Do I need plumber’s putty to install a kitchen faucet?
Not always. Many faucets use a built-in gasket and don’t require putty. Use only the sealant recommended by the faucet manufacturer, especially with stone or other surfaces that may be affected by certain products.
Can I reuse the old supply lines?
Only if they’re in good condition, compatible with the new faucet, and the manufacturer allows it. Replace hoses that are cracked, rusty, kinked, or too short; new hoses are often inexpensive compared with the damage a failed line can cause.
Why is my new faucet leaking under the sink?
The most common causes are a loose or misaligned hose connection, a damaged washer, or a connection that was cross-threaded. Turn off the water, dry the area, and inspect each joint. If a valve or pipe is leaking, not just the faucet connection, stop and get plumbing help.
Conclusion
To replace a kitchen faucet, confirm the new model fits, shut off the hot and cold water, remove the old faucet, clean the sink, and install the replacement according to its instructions. Take extra care with old shutoff valves and hose connections, then check for leaks both while the faucet runs and after it has been sitting. With the right tools and a patient approach, you can handle a standard replacement without calling a plumber—and know when a plumbing problem is beyond a simple faucet swap.
