You can replace a bath faucet in two to four hours with basic tools

Replacing a bath faucet is a plumbing task you can do yourself if you are comfortable working under a sink and tightening connections. You will need an adjustable wrench, a screwdriver, plumber's tape, and the new faucet. The job involves turning off the water, disconnecting the old faucet, removing it from the sink or wall, installing the new one, and reconnecting the supply lines. Most people finish in an afternoon without calling a plumber.

The hardest part is usually removing the old faucet if it has been in place for years — corrosion can make connections stick. If you run into a connection you cannot loosen after fifteen minutes of steady work, stop and consider calling a plumber rather than risk cracking the sink or stripping a fitting.

Key Takeaways

  • Turn off the water at the shutoff valves under the sink before you disconnect anything, and test that the water is actually off by turning the faucet handle.
  • The old faucet is held in place by nuts underneath the sink or by a mounting bracket on the wall — you will need to remove these before you can pull out the faucet body.
  • Wrap plumber's tape around the threads of the new faucet's supply line connections to prevent leaks when you tighten them.
  • Hand-tighten all connections first, then use a wrench to snug them — over-tightening can crack plastic washers or strip the fitting.
  • Test for leaks by turning the water back on and checking under the sink for drips before you consider the job finished.

Shut off the water and drain the lines

Look under the sink for two shutoff valves — one for hot water and one for cold. They are usually oval knobs or small levers on the pipes coming up from the wall or floor. Turn both clockwise (or flip both levers perpendicular to the pipe) until they stop. Do not force them; they should turn smoothly.

Turn on the faucet at the sink and let it run until no water comes out. This drains the lines so you do not get soaked when you disconnect the supply hoses. If water still drips after thirty seconds, the shutoff valve may be faulty — in that case, you may need to shut off the main water supply to the house instead, which is usually in the basement or outside.

Disconnect the supply hoses from the old faucet

Under the sink, you will see two flexible hoses (or sometimes rigid copper tubes) connected to the faucet body. One is hot water, one is cold. Use an adjustable wrench to hold the fitting on the faucet itself while you turn the nut on the hose counterclockwise with another wrench. Turn slowly — if the fitting spins instead of the nut loosening, you are turning the wrong direction or the wrench is slipping.

Once both hoses are loose, pull them away from the faucet. A small amount of water may drip out — have a towel ready. If the hoses are old and cracked, this is a good time to replace them with new ones; they cost ten to twenty dollars and come with new washers and nuts already attached.

Remove the old faucet from the sink or wall

The faucet is held in place by nuts on the underside of the sink (for deck-mounted faucets) or by a mounting bracket on the wall (for wall-mounted faucets). For a deck-mounted faucet, reach up under the sink and use a wrench to turn the mounting nuts counterclockwise. You may need a basin wrench — a specialized wrench with a long handle and a small head that fits in tight spaces — if the space is cramped.

Once the nuts are loose, push the faucet up and out from above the sink. If it does not move, check that you have removed all fasteners and that no caulk is holding it down. Scrape away old caulk with a putty knife if needed. For a wall-mounted faucet, remove the bracket bolts and pull the faucet body away from the wall.

Clean the sink surface or wall where the old faucet sat. Use a scraper to remove old caulk and mineral deposits. Wipe the area dry with a cloth.

Install the new faucet and reconnect the supply lines

Place the new faucet in the mounting holes (or against the wall for wall-mounted models). From underneath, hand-tighten the mounting nuts or bolts — do not use a wrench yet. Make sure the faucet is straight and centered before you tighten further. Then use a wrench to snug the nuts, turning until they are firm but not so tight that you feel real resistance.

Wrap plumber's tape (also called thread seal tape or PTFE tape) around the threads where the supply hoses connect to the faucet. Wrap it clockwise three times around the threads. This tape prevents leaks at the connection. Screw the supply hose nuts onto the faucet by hand first, then use a wrench to tighten them. Hold the fitting with one wrench while you turn the nut with another, the same way you disconnected them.

If you are using new supply hoses, attach them the same way. If you are reusing the old hoses, inspect the washers inside the nuts — if they are cracked or flattened, replace them before reconnecting.

Seal the faucet and test for leaks

explore a bead of silicone caulk around the base of the faucet where it meets the sink or wall. Use a caulk gun and smooth the bead with a wet finger or caulk tool. This prevents water from running underneath the faucet and rotting the cabinet. Let the caulk dry for the time listed on the tube — usually two to four hours — before you use the sink.

Turn the shutoff valves back on by turning them counterclockwise (or flipping the levers parallel to the pipe). Turn the faucet handle on and let water run for a few seconds to clear air from the lines. Then turn it off and check under the sink for leaks. Look at the connection points where the hoses meet the faucet and where they meet the shutoff valves. Drips at these points mean the nuts need to be tightened more — use a wrench to turn them another quarter turn and check again.

If water is leaking from under the faucet body itself, the caulk may not have sealed properly, or the mounting nuts may be loose. Tighten the mounting nuts from underneath and reapply caulk if needed. If leaking continues after these steps, the faucet may be defective — contact the manufacturer or return it.

When to call a plumber instead

If the shutoff valves will not turn or water continues to run after you close them, the valves are broken and you need a plumber to replace them or shut off the main water supply. If you cannot remove the old faucet after twenty minutes of steady work — corrosion or mineral buildup may have fused the connections — a plumber has better tools and experience to remove it without damaging the sink.

If the mounting holes in your new sink do not match the holes in your old faucet, or if your sink has a different number of holes, you may need a plumber to drill new holes or fill old ones. If you are uncomfortable working with water connections or do not have the right tools, a plumber will finish the job in one to two hours and usually charges between one hundred fifty and three hundred dollars depending on your location and the faucet complexity.

Frequently Asked Questions

Do I need to turn off the main water supply or just the shutoff valves?

Use the shutoff valves under the sink first — they are faster and safer. Only turn off the main supply if the shutoff valves do not work or if you cannot find them. The main shutoff is usually in the basement, crawlspace, or outside the house near the foundation.

What if water leaks from the connection after I tighten it?

Turn off the water, loosen the nut, and check the washer inside — it may be cracked or missing. Replace the washer with a new one from a hardware store (they cost less than a dollar), wrap the threads with plumber's tape again, and reconnect. If the washer is fine, the fitting itself may be damaged and need replacement.

Can I use the old supply hoses with a new faucet?

Yes, if they are not cracked or kinked and the washers are in good condition. Inspect them carefully — if they are more than ten years old or show any damage, replace them. New hoses cost ten to twenty dollars and come ready to install.

How long does caulk take to dry before I can use the sink?

Most silicone caulk needs two to four hours to set enough that water will not wash it away. Check the tube for the exact time. You can use the sink before it fully cures, but avoid splashing water directly on the caulk for at least a few hours.

What is plumber's tape and why do I need it?

Plumber's tape (PTFE tape) is a thin white tape that wraps around threaded connections to fill tiny gaps and prevent leaks. It costs a dollar or two and comes in a small roll. Wrap it three times clockwise around the threads before you screw the connection together.