How to Convert a Two-Handle Kitchen Faucet to One: A Complete Guide

Upgrading your kitchen can be a rewarding experience, and one relatively simple yet impactful change you can make is converting your two-handle kitchen faucet to a single-handle model. Single-handle faucets offer increased convenience, a more modern look, and can sometimes even improve water efficiency. This comprehensive guide will walk you through the entire process, from assessing your existing setup to enjoying your new, sleek faucet.

Table of Contents

Understanding the Basics: Why Switch to a Single-Handle Faucet?

Before diving into the conversion process, let’s consider why you might want to make the switch. Single-handle faucets have gained popularity for several reasons.

Ease of Use: With a single lever, you can control both water temperature and flow with one hand. This is especially useful when you’re multitasking in the kitchen, like holding a dirty dish with one hand.

Modern Aesthetics: Single-handle faucets often feature a cleaner, more streamlined design that complements contemporary kitchen styles. They can instantly update the look of your sink area.

Water Efficiency: Some single-handle faucets are designed with water-saving features that can help reduce your water consumption, leading to lower utility bills.

Easier Cleaning: With fewer crevices and handles to clean around, single-handle faucets can be easier to maintain and keep sparkling.

However, there are also factors to consider. Some people prefer the precise temperature control offered by two-handle faucets. It really boils down to personal preference and the overall design you want to achieve in your kitchen.

Assessing Your Current Kitchen Sink and Plumbing

Before purchasing a new faucet, it’s crucial to assess your existing setup. This will help you choose the right replacement faucet and ensure a smooth installation.

Sink Hole Configuration: Examine your sink to determine the number of holes it has. Most two-handle faucets require three holes: one for each handle and one for the spout. Some sinks may have an additional hole for a sprayer or soap dispenser. Knowing this will help you select a single-handle faucet that either covers the existing holes or requires a deck plate.

Under-Sink Plumbing: Take a look under your sink to identify the supply lines for both hot and cold water. These lines connect to the shut-off valves. Note the type of connections and their condition. You might need to replace the supply lines if they are old or corroded.

Spout Height and Reach: Consider the height and reach of your current spout. Do you need a higher spout to accommodate large pots and pans? Do you want a longer reach to easily access all areas of the sink? Choose a single-handle faucet with similar or improved dimensions.

Sprayer Hose (If Applicable): If your current faucet has a sprayer, you’ll need to ensure your new faucet either has a built-in sprayer or you purchase a separate side sprayer that can be installed in one of the existing holes.

Gathering the Necessary Tools and Materials

Having the right tools and materials on hand will make the conversion process much smoother and more efficient. Here’s a list of essentials:

New Single-Handle Kitchen Faucet: Choose one that fits your sink’s hole configuration and meets your aesthetic preferences.
Basin Wrench: This specialized wrench is designed to reach and loosen nuts in tight spaces under the sink.
Adjustable Wrench: For general tightening and loosening of nuts and bolts.
Pliers: For gripping and manipulating smaller parts.
Screwdrivers (Phillips and Flathead): To remove screws and fasteners.
Plumber’s Tape (Teflon Tape): To seal threaded connections and prevent leaks.
Putty Knife or Scraper: To remove old putty or sealant.
Bucket or Basin: To catch water during the removal process.
Towels or Rags: For cleaning up spills and drying surfaces.
Supply Lines (Optional): If your existing supply lines are old or corroded, consider replacing them.
Deck Plate (Optional): If your new faucet doesn’t cover all the existing holes in the sink, you’ll need a deck plate to cover the unused ones.
Safety Glasses: To protect your eyes from debris.
Work Gloves: To protect your hands.
Penetrating Oil (Optional): To loosen stubborn nuts and bolts.

Step-by-Step Guide: Removing the Old Two-Handle Faucet

Before you start any work, turn off the water supply to your faucet. This is typically done by closing the shut-off valves located under the sink. If you don’t have shut-off valves, you’ll need to turn off the main water supply to your house.

Prepare the Area: Place a bucket or basin under the sink to catch any water that may still be in the pipes. Cover the surrounding area with towels or rags to protect it from spills.
Disconnect the Water Supply Lines: Use an adjustable wrench to carefully disconnect the supply lines from the faucet tailpieces. Be prepared for a small amount of water to spill out.
Loosen the Mounting Nuts: Use a basin wrench to loosen the nuts that secure the faucet to the sink. These nuts are typically located under the sink, near the base of the faucet handles and spout. This is often the most challenging part of the removal process, as these nuts can be difficult to reach and may be corroded. Penetrating oil can help loosen them.
Remove the Old Faucet: Once the mounting nuts are loose, carefully lift the old faucet up and out of the sink. You may need to wiggle it gently to break any seals.
Clean the Sink Surface: Use a putty knife or scraper to remove any old putty or sealant from the sink surface around the faucet holes. Clean the area thoroughly with a damp cloth and cleaner.

Installing the New Single-Handle Faucet

With the old faucet removed and the sink surface cleaned, you’re ready to install your new single-handle faucet.

Install the Deck Plate (If Necessary): If your new faucet doesn’t cover all the existing holes in the sink, install the deck plate according to the manufacturer’s instructions. Typically, this involves applying sealant to the underside of the deck plate and then securing it to the sink with screws or clips.
Insert the Faucet: Carefully insert the faucet into the appropriate hole in the sink or deck plate. Ensure that it is properly aligned and centered.
Secure the Faucet: From under the sink, attach the mounting hardware that came with your new faucet. This usually involves tightening nuts onto the faucet tailpieces. Follow the manufacturer’s instructions carefully to ensure that the faucet is securely mounted. A basin wrench may be required for this step.
Connect the Water Supply Lines: Connect the hot and cold water supply lines to the faucet tailpieces. Use plumber’s tape on the threaded connections to ensure a watertight seal. Tighten the connections with an adjustable wrench, but be careful not to overtighten them, as this can damage the supply lines or the faucet. If you are using new supply lines, make sure they are the correct length and have the appropriate fittings.
Connect the Sprayer Hose (If Applicable): If your new faucet has a sprayer, connect the sprayer hose according to the manufacturer’s instructions. This usually involves attaching the hose to a connector on the faucet body and then securing the sprayer head to the sink or deck plate.
Check for Leaks: Turn on the water supply slowly and carefully. Check all connections for leaks. If you find any leaks, tighten the connections slightly or reapply plumber’s tape.
Test the Faucet: Test the faucet by turning it on and off, adjusting the water temperature, and using the sprayer (if applicable). Make sure everything is working properly.

Dealing with Common Challenges

Converting a two-handle faucet to a single-handle model can sometimes present challenges. Here’s how to handle some common issues:

Stubborn Nuts and Bolts: If you’re having trouble loosening the mounting nuts on the old faucet, try using penetrating oil. Apply the oil liberally and let it sit for several minutes before attempting to loosen the nuts again. A longer wrench or breaker bar can also provide additional leverage.

Corroded Supply Lines: If your supply lines are corroded, it’s best to replace them. Corroded lines can leak or burst, causing water damage.

Incorrect Hole Spacing: If the holes in your sink don’t align with the mounting hardware of your new faucet, you may need to purchase a different faucet or modify the sink. Modifying the sink should be done by a professional plumber.

Leaks After Installation: If you experience leaks after installing the new faucet, check all connections carefully. Make sure the supply lines are properly tightened and that plumber’s tape was applied to all threaded connections. If the leak persists, you may need to replace the supply lines or the faucet.

Limited Under-Sink Space: Working under the sink can be challenging due to limited space. Use a comfortable position and take breaks as needed. A headlamp can help you see better in the dimly lit area.

Finishing Touches and Maintenance

Once you’ve successfully installed your new single-handle faucet, there are a few finishing touches you can add to complete the project:

Clean Up: Clean up any spills and debris from the work area. Dispose of the old faucet and packaging properly.
Tighten Connections Again: After a few days of use, check all connections again for leaks and tighten them if necessary.
Regular Cleaning: Clean your new faucet regularly with a mild soap and water solution to keep it looking its best. Avoid using abrasive cleaners, as they can scratch the finish.
Check Aerator: The aerator, located at the tip of the spout, can become clogged with mineral deposits over time. Clean it periodically by unscrewing it and soaking it in vinegar.

When to Call a Professional Plumber

While converting a two-handle faucet to a single-handle model is a manageable DIY project for many homeowners, there are situations where it’s best to call a professional plumber.

Extensive Plumbing Modifications: If your sink or plumbing requires significant modifications, such as moving pipes or adding new supply lines, it’s best to hire a plumber.
Persistent Leaks: If you’re unable to stop leaks after attempting to tighten connections and reapply plumber’s tape, a plumber can diagnose and fix the problem.
Lack of Experience: If you’re not comfortable working with plumbing, it’s best to leave the job to a professional.
Code Compliance: A plumber can ensure that your installation complies with local plumbing codes.

Enjoying Your New Kitchen Faucet

Congratulations on successfully converting your two-handle kitchen faucet to a single-handle model! You can now enjoy the convenience, aesthetics, and potential water-saving benefits of your new faucet. Remember to maintain it properly to ensure it lasts for years to come. The updated look and improved functionality will surely enhance your kitchen experience.

What are the key differences between a two-handle and a single-handle kitchen faucet?

A two-handle kitchen faucet typically uses separate hot and cold water valves, requiring you to adjust each handle individually to reach your desired water temperature. This design can be less convenient for tasks that require frequent temperature adjustments and might lead to water wastage as you fine-tune the balance. Furthermore, the installation process might involve more complex plumbing connections for each valve.

In contrast, a single-handle faucet combines hot and cold water control into a single lever or knob, allowing for easy one-handed operation and quick temperature adjustments. This design often results in less water wastage and a more streamlined appearance. Single-handle faucets are generally considered easier to install, especially for those with limited plumbing experience, as they require fewer connections.

What tools will I need to convert my two-handle kitchen faucet to a one-handle faucet?

Converting a two-handle kitchen faucet to a single-handle faucet requires a basic set of plumbing tools to ensure a smooth and leak-free installation. Essential tools include an adjustable wrench, a basin wrench (for reaching tight spaces under the sink), a screwdriver set (both flathead and Phillips), a pipe wrench, a plumber’s tape (Teflon tape), and possibly a putty knife to remove old sealant. Having a bucket and towels handy to catch any residual water is also crucial.

In addition to these standard tools, you might need specific tools depending on the type of faucet and sink configuration. For example, if the existing faucet is heavily corroded, penetrating oil might be necessary to loosen stubborn connections. Also, having a flashlight or headlamp is beneficial for improved visibility while working under the sink. Safety glasses are always recommended to protect your eyes from debris.

Can I convert a two-handle faucet to a one-handle faucet myself, or should I hire a professional plumber?

Whether you can convert a two-handle faucet to a one-handle faucet yourself depends largely on your plumbing skills and comfort level. If you are comfortable with basic plumbing tasks, such as disconnecting and reconnecting water lines, and you are confident in your ability to follow instructions carefully, then a DIY approach is certainly possible. The conversion often involves disconnecting the existing water supply lines, removing the old faucet, and installing the new single-handle faucet according to the manufacturer’s instructions.

However, if you are unsure about any aspect of the process or have encountered plumbing issues in the past, it’s best to hire a professional plumber. Incorrect installation can lead to leaks, water damage, and other problems that can be costly to repair. A plumber will have the necessary experience and tools to ensure the conversion is done correctly and efficiently, providing peace of mind.

What should I do if I encounter corrosion when removing the old two-handle faucet?

Corrosion is a common issue when removing old faucets, particularly around the connections and mounting nuts. If you encounter corrosion, the first step is to apply a penetrating oil or rust remover to the affected areas. Let the oil sit for at least 15-30 minutes, or even longer for severe corrosion, to help loosen the rust and grime.

After allowing the penetrating oil to work, gently try loosening the corroded parts with an adjustable wrench or a basin wrench. Avoid applying excessive force, as this could damage the pipes or the faucet itself. If the parts remain stubborn, try tapping the wrench lightly with a hammer to help break the corrosion. If all else fails, consider using a pipe cutter to carefully cut through the corroded parts, but be extremely cautious not to damage the surrounding plumbing.

What type of sink is suitable for converting to a one-handle faucet?

Most kitchen sinks are suitable for converting from a two-handle to a one-handle faucet, but the sink’s configuration and existing holes play a significant role in the installation process. Sinks with three or four holes are ideal, as the center hole can be used for the single-handle faucet, and the extra holes can be covered with a deck plate (escutcheon) that is often included with the new faucet.

If your sink only has two holes, you will need to either drill an additional hole (if the sink material allows) or purchase a single-handle faucet with a base that can cover the two existing holes. Drilling into materials like stainless steel or porcelain can be challenging and may require specialized tools and techniques. Always consider the sink material and the existing hole configuration before choosing a one-handle faucet.

What type of maintenance should be done on a single-handle faucet after installation?

After installing your new single-handle faucet, regular maintenance will help extend its lifespan and ensure smooth operation. Regularly check for leaks around the base of the faucet and the connections under the sink. Tighten any loose connections with a wrench, being careful not to overtighten and damage the fittings.

Periodically clean the faucet’s aerator by unscrewing it and rinsing it under running water to remove any mineral deposits or debris. Also, clean the exterior of the faucet with a mild soap and water solution to prevent buildup and maintain its appearance. If you notice any dripping or reduced water flow, the cartridge inside the faucet might need to be replaced. Consult the manufacturer’s instructions for specific maintenance guidelines for your faucet model.

How do I properly connect the water supply lines to the new single-handle faucet?

Properly connecting the water supply lines is crucial for a leak-free installation of your new single-handle faucet. First, make sure the water supply is turned off at the shut-off valves under the sink. Then, use plumber’s tape (Teflon tape) on the threads of the faucet’s supply line connections to ensure a tight seal. Wrap the tape clockwise several times, overlapping each wrap.

Carefully connect the hot and cold water supply lines to the corresponding connections on the faucet, tightening them securely with an adjustable wrench. Avoid overtightening, as this can damage the fittings. After connecting the lines, slowly turn on the water supply and check for any leaks around the connections. If you notice any leaks, turn off the water supply, tighten the connections slightly more, and recheck.