How to Replace a Bathroom Faucet: A Step-by-Step DIY Guide
About This Project
This comprehensive guide demonstrates how to replace a bathroom faucet yourself. The project begins by emphasizing safety and turning off the water supply using the shut-off valves located beneath the sink. Next, using an adjustable wrench, disconnect the supply lines from the old faucet, taking care to collect any residual water in a bucket or with towels. After disconnecting the lines, remove the old faucet. This often requires the use of a basin wrench to loosen the mounting nuts underneath the sink. Once the old faucet is removed, take time to clean the sink surface. Next install the new faucet ensuring a proper seal and secure connections. Sealant, such as plumber's putty, is sometimes used in this step. After installation, turn the water supply back on slowly and carefully check for leaks at all connections. Finally, test the functionality of the new faucet to ensure proper operation.
Best for experienced DIYers and homeowners with some experience.
Tools & Materials
Crescent 12 in. Chrome Adjustable Wrench AC212VS
Towel
TEKTON 10 in. to 17 in. Telescoping 7/8 - 2-1/2 in. Basin Wrench WRN92004
Simple Green 1 Gal. Concentrated All-Purpose Cleaner 271010613005
Oatey 9 oz. Stain-Free Plumber's Putty 31177
Crescent 12 in. Chrome Adjustable Wrench AC212VS
Since the introduction of the original Crescent wrench in the early 1900s, the Crescent brand has become synonymous with adjustable wrenches. Crescent Adjustable Wrenches feature a large knurl for easy
Towel
Absorbs moisture and dries surfaces.
TEKTON 10 in. to 17 in. Telescoping 7/8 - 2-1/2 in. Basin Wrench WRN92004
Uniquely designed for easy, one-handed operation in confined areas, the TEKTON Telescoping Basin Wrench takes the frustration out of under-sink work. Ideal for larger nuts and retaining collars on faucets,
Simple Green 1 Gal. Concentrated All-Purpose Cleaner 271010613005
EPA Safer Choice Certified Simple Green All-Purpose Cleaner is a powerful cleaner and degreaser designed for effective and environmentally safer use on all washable surfaces. The biodegradable formula
Oatey 9 oz. Stain-Free Plumber's Putty 31177
For setting frames, faucets and basket strainers, use this Oatey 9 oz. Stain-Free Plumber's Putty on granite, marble, quartz, sandstone and other natural, porous materials. Will not crack or shrink. Cleans
Steps
Shut Off the Water Supply
5 minsBefore you begin, safety first! Locate the hot and cold water shut-off valves under your sink. Turn both valves clockwise until they stop, effectively cutting off the water supply to the faucet. Then, turn on the faucet briefly to release any remaining water pressure in the lines.
Watch: Shut Off Water Supply
Disconnect the Faucet Supply Lines
10 minsUsing an adjustable wrench, carefully disconnect the water supply lines from the old faucet. Place a bucket or towels underneath to catch any dripping water. Remember to note which line is hot and which is cold.
Watch: Shut Off Water and Disconnect Faucet Line
Remove the Old Faucet
15 minsNow, it's time to remove the old faucet. Usually, this involves removing mounting nuts located under the sink. A basin wrench is often helpful for accessing these nuts. Different faucet types may require additional tools like screwdrivers. Once the nuts are removed, carefully lift the faucet out of the sink.
Watch: Remove Old Faucet
Install the New Faucet
30 minsCarefully follow the manufacturer's instructions for installing your new faucet. This typically involves attaching the new mounting hardware, connecting the supply lines, and applying sealant as needed. Take your time and ensure all connections are secure.
Watch: Install New Faucet Body
Common Problems
Difficulty reaching and tightening faucet nuts in tight spaces.
Solution: Long arms are an advantage when working in deep, narrow cabinets. If needed, you can tighten the nuts with a basin wrench.
Scratched porcelain sink when removing old caulk.
Solution: An old credit card or gift card makes a great scraper that is less likely to scratch a porcelain sink.
Water leaks under the sink due to a faulty faucet seal.
Solution: Apply plumber's putty to the base of the new faucet to create a watertight seal.
Forgetting a crucial step can lead to a leaky faucet or a frustrating installation.
Solution: Read the instructions carefully before you begin.
Difficulty reaching and tightening supply line nuts after faucet installation.
Solution: If your faucet's supply lines are not pre-attached, it's much easier to attach them before mounting the faucet to the sink.
Can't tighten faucet nut in tight space.
Solution: The installation tool provides leverage to tighten the nut in the confined space under the sink.
Confirm the water is completely off by turning the faucet handle. A small trickle is normal, but a steady flow means the valve is not fully closed.
Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.
Frequently Asked Questions
Why is a basin wrench listed as a required tool for this project?
A basin wrench is crucial because it's specifically designed to reach and loosen the mounting nuts that secure the faucet from underneath the sink. These nuts are often in very tight, awkward spaces where a regular adjustable wrench simply cannot fit or get enough leverage.
What should I do if the old faucet's mounting nuts are corroded and won't budge?
First, try applying a penetrating oil to the corroded nuts and let it sit for 15-30 minutes to help break down the rust. If they still won't turn, you may need to use a small hacksaw or a specialized nut splitter designed for plumbing to carefully cut through the nuts. Always wear eye protection when doing this.
Is 3 hours a realistic time estimate for someone who's never replaced a faucet before?
While 3 hours is a good estimate for an experienced DIYer, beginners should budget a bit more time, perhaps 4-6 hours. This allows for unexpected challenges like stubborn old parts, cleaning time, and carefully familiarizing yourself with the new faucet's instructions without rushing.
After installing the new faucet and turning the water back on, I have a small leak under the sink. What should I check first?
The most common culprits for leaks are loose supply line connections or improperly tightened mounting nuts. Gently but firmly tighten these connections with your adjustable wrench. If the leak persists, you may need to disassemble the connection, inspect the washers/gaskets, and reassemble with plumber's tape or a fresh application of plumber's putty if applicable.
Do I always need to use plumber's putty when installing a new faucet?
Many modern faucets come with integrated rubber gaskets or O-rings that create a watertight seal, making plumber's putty unnecessary. However, if your faucet didn't include these, or if you're working with an older style, a thin, even bead of plumber's putty under the faucet's base can provide an excellent, watertight seal.
How can I ensure my new faucet will be compatible with my existing sink before I buy it?
Measure the number of mounting holes on your sink and the distance between them (center-to-center). Most faucets are either single-hole, 4-inch center set (3 holes), or 8-inch widespread (3 holes). Also, check the thickness of your sink deck to ensure the new faucet's threaded shanks are long enough to pass through and secure properly.
What's the most important safety precaution I need to take during this project?
The absolute most critical safety precaution is to completely shut off the water supply to the sink before starting any work. This is typically done using the shut-off valves directly beneath the sink. Double-check that the water is off by turning on the old faucet to ensure no water comes out, preventing accidental flooding.
