Step-by-Step Guide: How to Replace a Bathroom Faucet in 2025

Replacing a bathroom faucet might seem like a complicated plumbing job, but with the right tools and a step-by-step approach, it’s a simple DIY project that most homeowners can complete in a few hours. Whether you’re upgrading to a modern faucet with water-saving features or replacing an old, leaky fixture, this guide will walk you through the entire process in an easy-to-follow, beginner-friendly way.

In this guide, you’ll learn everything you need to know about removing an old faucet, installing a new one, and ensuring a leak-free finish. We’ll cover what tools and materials you need, how to prevent common installation mistakes, and when to seek professional help. By the end, you’ll have the confidence to replace your faucet without hiring a plumber!

What Tools and Materials Do I Need to Replace a Bathroom Faucet?

Before getting started, it’s important to gather all the necessary tools and materials. Having everything on hand will save time and help you avoid frustration during the installation process.

Essential Tools for Faucet Replacement

✔ Adjustable Wrench – Used to loosen and tighten the nuts on the water supply lines and faucet connections. A standard wrench works, but an adjustable one is better for different nut sizes.

✔ Basin Wrench – This is a must-have tool for working in tight spaces under the sink. It allows you to reach the mounting nuts that secure the faucet to the sink.

✔ Plumber’s Tape (Teflon Tape) – A thin, flexible tape that helps prevent leaks when connecting water supply lines.

✔ Phillips & Flathead Screwdrivers – Used for removing screws from faucet components or securing mounting brackets.

✔ Bucket & Towels – A bucket will catch any leftover water from the pipes, while towels help keep the work area dry and prevent water damage.

✔ Plumber’s Putty or Silicone Caulk – These sealants help create a waterproof barrier at the base of the faucet, preventing leaks around the sink.

Materials Needed for a New Faucet Installation

✔ New Bathroom Faucet – Choose a faucet that matches the number of holes in your sink. Standard sinks come in single-hole, centerset (3-hole, 4-inch spread), or widespread (3-hole, 8-inch spread) configurations.

✔ Water Supply Lines – These flexible tubes connect the faucet to the water valves under the sink. Some new faucets include supply lines, but if yours doesn’t, you may need to purchase them separately.

✔ Sink Drain Kit (if replacing the drain too) – Many new faucets come with a matching drain assembly. If your old drain is worn or doesn’t match the new faucet, replacing it is a good idea.

Do I Need a Basin Wrench to Replace My Faucet?

Yes, a basin wrench is one of the most useful tools for replacing a bathroom faucet, especially if your sink has limited space underneath. Unlike a standard adjustable wrench, which requires room to maneuver, a basin wrench is specifically designed for tight spaces where it’s difficult to reach and turn mounting nuts.

Why is a Basin Wrench Important?

When installing or removing a faucet, you need to loosen or tighten the mounting nuts that secure the faucet to the sink. These nuts are typically located directly behind the sink basin, in a narrow and hard-to-reach area. A standard wrench or pliers might not fit into this space, making it frustrating and time-consuming to complete the job.

A basin wrench has a long handle and a pivoting jaw, allowing you to:

✔ Reach deep, awkward spaces without straining your hands or arms.
✔ Grip and turn nuts securely, even when you don’t have a clear line of sight.
✔ Apply torque easily, making it more effective for loosening old, corroded, or overtightened nuts.

How to Use a Basin Wrench Correctly

1. Adjust the Jaw Position: The wrench head has a spring-loaded, adjustable jaw that can grip nuts of various sizes. Set the jaw so it grabs the nut firmly when you turn the handle.
2. Position the Wrench Handle: Insert the long handle into the tight space behind the sink and align the jaw with the nut.
3. Turn in the Correct Direction: Rotate the handle counterclockwise to loosen and clockwise to tighten. The wrench’s head automatically grips the nut as you apply force.
4. Continue Turning Until Secure or Loose: If removing an old faucet, keep turning until the nut is fully loosened. If installing a new faucet, tighten the nuts securely but avoid over-tightening, which could crack the sink.

How Do I Remove the Old Bathroom Faucet?

Before installing a new faucet, you first need to carefully remove the old one while avoiding damage to the sink, plumbing connections, and surrounding fixtures. This process involves shutting off the water supply, disconnecting the existing water lines, and loosening the mounting hardware. If your faucet has been in place for a long time, you may encounter corroded nuts, mineral buildup, or stuck components, which can make removal more challenging. However, with the right approach and tools, you can safely remove your old faucet without unnecessary complications.

Steps to Shut Off the Water Supply

Turning off the water supply is a crucial first step in the faucet removal process. If you skip this step, you risk water spilling out uncontrollably, which can lead to leaks and water damage under the sink. Follow these steps carefully:

1. Locate the Shut-Off Valves

   • Look under the sink for two small, round or oval-shaped shut-off valves. There should be one for the hot water line and one for the cold water line.
   • If you cannot find these valves, or if your home does not have them, you may need to turn off the main water supply to your house.

2. Turn the Valves Clockwise to Close Them

   • Use your hand to turn each valve clockwise until it stops. This will shut off the water supply to the faucet.
   • If the valve is stiff or hard to turn, use pliers or a wrench to help, but avoid using excessive force to prevent breaking the valve.

3. Drain Any Remaining Water in the Pipes

   • Turn on the faucet and let the remaining water run out. This will release any built-up pressure in the pipes and prevent water from spilling when you disconnect the supply lines.

4. Place a Bucket or Towels Under the Sink

   • Even after turning off the valves, a small amount of water may still be in the pipes.
   • Position a bucket or an absorbent towel under the shut-off valves and supply lines to catch any drips or leaks when disconnecting the plumbing connections.

Once you have successfully shut off the water and drained the pipes, you can move on to disconnecting the faucet.

Removing the Old Bathroom Faucet and Supply Lines

Once the water is off and the area is prepared, the next step is to disconnect the water supply lines and remove the faucet assembly from the sink.

1. Disconnect the Water Supply Lines

   • Use an adjustable wrench to loosen the nuts that connect the hot and cold water supply lines to the shut-off valves.
   • Turn the nuts counterclockwise to remove them. If they are stuck due to mineral deposits, try using a penetrating oil like WD-40 and let it sit for 10–15 minutes before attempting again.

2. Loosen the Mounting Nuts Under the Sink

   • The faucet is secured to the sink with mounting nuts, which hold it in place. These nuts are usually located behind or beneath the sink basin, in a tight and hard-to-reach area.
   • Use a basin wrench to reach and turn the mounting nuts counterclockwise. If the nuts are difficult to remove due to corrosion, apply penetrating oil and let it sit before trying again.

3. Lift the Faucet Out of the Sink

   • Once the mounting nuts are fully loosened, gently lift the old faucet up and out of the sink. If the faucet is stuck due to old sealant or mineral buildup, use a putty knife or plastic scraper to break the seal without scratching the sink surface.

4. Clean the Sink Surface

   • After removing the faucet, you may notice leftover plumber’s putty, silicone residue, or mineral deposits around the mounting area.
   • Use a mild cleaning solution and a non-abrasive sponge or cloth to wipe away any buildup. If there’s stubborn residue, white vinegar or baking soda can help dissolve it.
   • Dry the area completely before installing the new faucet to ensure a smooth and watertight fit.

Dealing with Stubborn or Corroded Fittings

If your old faucet has been in place for many years, you may encounter rusted, corroded, or stuck fittings that make removal more difficult. Here are some tips to help:

✔ Apply Penetrating Oil – Spray WD-40 or another penetrating lubricant on the stuck nuts and let it sit for 10–15 minutes. This helps break down rust and mineral buildup, making the nuts easier to loosen.

✔ Use a Basin Wrench for Extra Leverage – A long-handled basin wrench allows you to grip and turn mounting nuts that are hard to reach.

✔ Gently Tap the Nuts with a Hammer – A light tap can help loosen rusted connections. Avoid hitting too hard, as this could damage the sink or pipes.

✔ Use Heat for Metal Nuts – If penetrating oil doesn’t work, try using a hairdryer or heat gun to warm up the metal. Heat can cause the metal to expand slightly, loosening the stuck connection.

✔ Cut the Nuts Off as a Last Resort – If all else fails, use a hacksaw or rotary tool to carefully cut through the old mounting nuts. Be cautious not to damage the sink or plumbing.

Once the old faucet is completely removed and the sink surface is clean, you are ready to install the new faucet and transform your bathroom with an upgraded look.

What’s the Process for Installing a New Bathroom Faucet?

Preparing the Sink for the New Bathroom Faucet

Before installing the new faucet, make sure the sink surface is dry and free from debris. If the faucet requires a gasket, plumber’s putty, or silicone sealant, apply it to the base of the faucet as directed in the manufacturer’s instructions.

Step-by-Step Guide to Install a Bathroom Faucet

1. Position the Faucet: Insert the faucet into the mounting holes on the sink. Make sure it is aligned properly before tightening.
2. Secure the Faucet: From underneath the sink, attach the mounting nuts and tighten them using a basin wrench. Do not overtighten, as this may crack the sink.
3. Attach the Supply Lines: Connect the hot and cold water supply lines to the corresponding shut-off valves. Wrap Teflon tape around the threads for a leak-proof connection.
4. Reconnect the Drain (if replacing it): If your new faucet includes a pop-up drain assembly, follow the manufacturer’s instructions to install it properly.

How Do I Ensure Proper Installation and Prevent Leaks?

Once the faucet is installed, turn the water supply back on slowly and check for leaks.

✔ Inspect the connections under the sink and tighten any loose nuts.
✔ Run the faucet for a few minutes and check for drips around the base.
✔ If there’s a slow leak, apply more plumber’s tape and retighten the fittings.

Can I Replace a Bathroom Faucet Without Professional Help?

Yes! DIY faucet replacement is a manageable project for beginners.

✔ Pros: Saves money, gives you control over the installation, and can be done in 1–2 hours.
✔ Cons: Requires some plumbing knowledge, and tight spaces can make installation tricky.

If you run into persistent leaks or corroded pipes, it may be best to call a professional plumber.

What Should I Consider When Choosing a New Bathroom Faucet?

When shopping for a new faucet, consider:

✔ Faucet Type:

• Single-handle: Easy to use and modern.
• Widespread: Stylish and traditional.
• Wall-mounted: Saves counter space.

✔ Material & Finish: Choose brass, stainless steel, or chrome for durability.

✔ Water-Saving Features: Many modern faucets have low-flow technology to reduce water waste.

By selecting a high-quality faucet and following this guide, you can upgrade your bathroom with a functional and stylish new fixture that lasts for years.

Insideast: Premium Brass Bathroom Faucets for a Timeless Upgrade

When replacing a bathroom faucet, choosing a high-quality fixture is just as important as proper installation. If you’re looking for a faucet that combines durability, elegance, and timeless craftsmanship, Insideast offers a premium selection of brass bathroom faucets designed to enhance both modern and traditional bathrooms.

Why Choose Insideast Brass Faucets?

✔ Solid Brass Construction – Unlike standard faucets that use lower-grade metals, Insideast faucets are made from 100% solid brass, ensuring superior durability and corrosion resistance. This means your faucet won’t just look beautiful—it will stand the test of time.

✔ Timeless Aesthetic – Whether you prefer an antique-inspired unlacquered brass finish that develops a natural patina or a brushed gold faucet with a modern matte texture, Insideast provides stunning designs that suit any bathroom style.

✔ Easy Installation & Compatibility – Designed to fit standard bathroom sinks, Insideast faucets are compatible with single-hole, centerset, and widespread configurations, making them an excellent choice for both DIY homeowners and professional plumbers.

✔ Luxury Finishes – Insideast offers a variety of high-end finishes including brushed brass, polished brass, and vintage gold, ensuring that your faucet complements your existing décor while adding a touch of sophistication.

🔗 Explore the Insideast Bathroom Faucet Collection to find the perfect match for your new installation.