How to Replace a Bathroom Sink Faucet: A Step-by-Step DIY Guide
About This Project
This project details how to replace a bathroom sink faucet. The first step involves turning off both the hot and cold water supply lines underneath the sink to prevent leaks during the replacement. Next, disconnect the old supply lines from the faucet and the angle stops, using an adjustable wrench and bucket to catch leaks. Then, remove the old faucet's mounting nuts, typically located underneath the sink, with a basin wrench or an adjustable wrench before lifting out the old faucet. With the old faucet removed, install the new one following the manufacturer's instructions, and secure it from underneath the sink. Connect the supply lines and secure the faucet before checking for leaks around the base. Finally, turn the water supply back on slowly and check all connections for leaks, running both hot and cold water for a few minutes to make sure everything works correctly.
Best for experienced DIYers and homeowners with some experience.
Tools & Materials
Adjustable Wrench
Unger 6 Gal. Heavy-Duty Plastic Bucket DB02
Husky Basin Wrench 16PL0127
Oatey 14 oz. Plumber's Putty 311662
Plumbers Tape
Adjustable Wrench
Fits various nut and bolt sizes with its adjustable jaw.
Unger 6 Gal. Heavy-Duty Plastic Bucket DB02
The Unger 6-Gallon Heavy-Duty Professional Cleaning Bucket holds more than 6 Gal. of liquid. The bucket can accommodate a scrubber up to 14 in. L. This bucket features measurement marks and 2-pour spouts
Husky Basin Wrench 16PL0127
Husky's 11 in. Basin Wrench is made from heavy-duty steel and has a reversible head for accessing faucet nuts in tight spaces. The 180 pivoting head holds its position at any angle to access hard-to-reach
Oatey 14 oz. Plumber's Putty 311662
The Oatey 14 oz. Plumber's Putty is an easy-to-mold setting compound designed for use with stainless-steel sealing applications such as frames, faucets and strainer baskets. Not for use on plastic, marble,
Plumbers Tape
Ensures leak-proof pipe joints.
Steps
Common Problems
Twisting pipes in the wall can cause leaks or damage.
Solution: You may need to use a second wrench to hold the valve steady while loosening the fitting to prevent twisting the pipe in the wall.
Be careful not to damage the shutoff valves or the pipes in the wall. If a connection is corroded, apply penetrating oil.
Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.
Connections are too tight to loosen with a standard wrench.
Solution: Use a basin wrench if the connections are tight.
Leaky faucet base due to misaligned or missing gaskets.
Solution: Ensure any included gaskets or seals are properly placed on the faucet base before inserting it into the countertop to create a watertight seal.
Leaky connections when installing a new faucet.
Solution: Be sure to use the appropriate gasket or sealant to prevent leaks.
Avoid over-tightening the mounting nuts, as this could damage the sink or the faucet.
Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.
Faucet spout is misaligned, requiring disassembly and reinstallation.
Solution: Ensure the faucet is facing the correct direction before fully tightening the mounting nut.
Frequently Asked Questions
Do I really need a basin wrench for this project, or can I just use an adjustable wrench?
While an adjustable wrench can sometimes work for easily accessible nuts, a basin wrench (like the Husky Basin Wrench 16PL0127 mentioned) is highly recommended. It's specifically designed to reach and loosen mounting nuts in tight, awkward spaces under the sink, making the removal of the old faucet much easier and less frustrating, especially for beginners.
What's the most crucial step to prevent water damage during the faucet replacement?
Absolutely ensure both the hot and cold water supply lines are completely turned off at the angle stops beneath the sink before you begin any work. Test by briefly turning on the old faucet to confirm the water flow has stopped. Keep the Unger 6 Gal. Heavy-Duty Plastic Bucket ready to catch any residual water when disconnecting lines.
What should I do if the old faucet's mounting nuts are rusted or impossible to loosen?
For stubborn or rusted nuts, first try applying a penetrating oil like WD-40 or Liquid Wrench and let it sit for 10-15 minutes to help loosen them. If they still won't budge, you may need to carefully use a hacksaw blade or a rotary tool with a cut-off wheel to cut through the nuts, taking extreme caution not to damage the sink or supply lines.
The project lists the difficulty as 'beginner', but an estimated 3 hours seems long. What makes it take that much time?
The 'beginner' difficulty refers to the straightforward nature of the tasks, not necessarily the speed. The 3-hour estimate accounts for potential real-world challenges such as tight working spaces, rusted nuts, properly reading new faucet instructions, and thorough leak testing. Rushing can lead to mistakes, so taking your time to be meticulous is key.
After installing the new faucet, I'm noticing small drips around the base. What should I check first?
First, ensure the mounting nuts underneath the sink are securely tightened, but avoid overtightening them, which can damage components. Verify that any rubber gaskets or O-rings supplied with the new faucet are correctly seated between the faucet base and the sink surface. Sometimes, adding a thin bead of plumber's putty or silicone caulk under the faucet base can provide an extra seal against drips.
Can I reuse my existing supply lines, or should I always replace them with the new faucet?
It is strongly recommended to replace old supply lines with new ones when installing a new faucet, even if they appear to be in good condition. Older lines can degrade over time, leading to leaks, and new lines provide better peace of mind. Many new faucets even come with fresh supply lines, and buying new ones is a relatively inexpensive way to prevent future issues.
