Learn How to Change Your Kitchen Faucet

Understanding Your Kitchen Faucet Components

Before you start replacing your kitchen faucet, it helps to understand what you're working with. A kitchen faucet consists of several key parts that work together to deliver water to your sink. The spout is the visible tube that water comes out of, and it can swivel or stay fixed depending on your model. The handle or handles control water flow and temperature—single-handle faucets have one lever, while two-handle faucets have separate knobs for hot and cold water.

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Underneath the sink, you'll find the valve body, which is the main part that regulates water flow. This connects to supply lines, which are flexible tubes or rigid pipes that bring water from your home's main supply. The aerator is a small screen at the tip of the spout that mixes air with water to reduce splashing and conserve water. Most faucets use between 1.5 and 2.2 gallons of water per minute, according to the EPA's WaterSense program.

The mounting hardware holds everything together and typically sits on top of the sink or countertop. Depending on your sink, you may have one, two, or three holes where the faucet attaches. P-traps and shutoff valves are located under the sink and control water flow to your faucet specifically. Understanding these parts means you'll recognize what to disconnect and reconnect during installation.

Practical takeaway: Take photos of your existing faucet setup before you begin, showing the overall layout and how supply lines connect. This visual reference will help you remember how to reconnect everything with your new faucet.

Gathering the Right Tools and Materials

Successful faucet replacement starts with having the correct tools on hand. You won't need anything exotic—most items are standard household tools. An adjustable wrench or basin wrench is essential for loosening and tightening connections under the sink. A basin wrench is specifically designed for tight spaces and has a long handle that lets you reach far back. An adjustable wrench works too, though it may be less convenient in cramped areas.

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You'll also need a screwdriver set with both Phillips and flathead options for removing mounting hardware. A flashlight or headlamp helps you see what you're doing under the sink, where lighting is typically dim. Teflon tape, also called plumber's tape or thread seal tape, costs just a few dollars and prevents leaks at threaded connections. Keep old towels nearby to catch water that will drain from the supply lines—expect about a cup of water to spill when you disconnect them.

Before purchasing your new faucet, measure your sink's existing holes. Most kitchen sinks have either a single hole, two holes, or three holes with different spacing. Single-hole faucets are becoming more common and can work with existing two-hole or three-hole sinks with adapter plates. Write down your measurements and take photos of your current setup to bring to the hardware store or reference when ordering online.

Consider getting a supply line kit if your new faucet doesn't include one. These are inexpensive (typically $10-20) and often include everything needed for connection. Some faucets come with everything; others require you to provide supply lines separately.

Practical takeaway: Create a checklist before shopping: adjustable wrench, screwdrivers, flashlight, Teflon tape, towels, and your sink measurements. Gathering everything beforehand prevents frustrating trips back to the store mid-project.

Turning Off Water and Disconnecting the Old Faucet

Safety starts with turning off the water supply before you begin any work. Look under your sink for shutoff valves on both the hot and cold supply lines. These are usually oval or round knobs located where the supply lines enter the cabinet. Turn both valves clockwise until they stop—you don't need to force them. If you can't find shutoff valves under the sink, you may need to use the main shutoff valve for your entire home, which is typically located near your water meter or where the main line enters your house.

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After shutting off the water, open the faucet at the sink to release any remaining pressure and water in the lines. This prevents water from spraying when you disconnect the supply lines. Place towels under the area where you'll be working to catch any remaining water.

Now you're ready to disconnect the old faucet. Start by loosening the supply line nuts where they connect to the faucet or valve body under the sink. Use your wrench to turn these counterclockwise. The nuts may be tight, especially if the faucet is older, so apply steady pressure rather than jerking. Once the supply lines are free, locate the mounting nuts that hold the faucet to the sink from underneath. These may be hidden under the sink rim or may be accessible from below. Loosen these nuts with your wrench until the faucet lifts out from the top of the sink.

If caulk sealed the old faucet to the sink, use a utility knife to cut through it before attempting to remove the faucet. This prevents damage to the sink finish. Some faucets also have a decorative collar or escutcheon plate that needs to be removed first.

Practical takeaway: After disconnecting the old faucet, clean the sink surface thoroughly with a damp cloth to remove mineral deposits, caulk residue, and debris. A clean surface makes installing the new faucet easier and creates a better seal.

Installing Your New Faucet

With the old faucet out, you're ready to install the new one. Start by checking that your new faucet fits your sink's hole configuration. If there's a mismatch, you may need an adapter plate. These plates are available at hardware stores and allow a single-hole faucet to work with a two-hole or three-hole sink, or vice versa. Position the adapter over the holes and secure it according to the manufacturer's instructions.

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Apply a bead of silicone caulk around the base of the sink holes (but not filling them). This prevents water from running under the faucet and causing rot or staining. Lower your new faucet into the hole from the top of the sink. Many new faucets have a collar or gasket that sits on top of the sink, creating a water-tight seal. Position this properly before tightening any mounting hardware.

From underneath the sink, slide the mounting bracket and nuts onto the faucet's threaded posts. Tighten these by hand first, then use your wrench to snug them down. Don't overtighten—this can crack the sink or strip the threads. Tighten just until snug, then give each nut a quarter turn more. The faucet should be stable and not wobble when you push it from the top.

Now connect the supply lines. If your new faucet came with inlet connections on the bottom, attach the supply lines directly to these. Use an adjustable wrench to tighten the nuts. If your faucet connects via a valve body, attach the supply lines to the valve. Wrap Teflon tape around the threaded connection points before attaching the supply lines—wrap it clockwise around the threads three times. This tape prevents leaks at these critical connections.

Some faucets include spray head hoses and diverters. These components direct water between the spout and the spray head. Install these according to your faucet's instructions, as the process varies by model.

Practical takeaway: Before tightening anything permanently, turn the water back on at the shutoff valves and test for leaks. It's much easier to adjust connections now than after everything is sealed up.

Testing and Troubleshooting Your Installation

Turn the shutoff valves back on slowly, starting with the cold water valve. Open the faucet handle at the sink to let air escape from the lines. You may hear sputtering or see water come out in bursts as the air is purged—this is normal. Close the faucet and repeat with the hot water valve. Once both lines are open, test your faucet thoroughly.

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Check for leaks at all connection points under the sink. Look especially at the supply line nuts and the faucet's inlet connections. Small drips are common in the first few minutes as air is still working out of the lines. If water is actively leaking from a nut connection, tigh