How to replace a bathroom faucet step by step

Replacing a bathroom faucet yourself takes about 45 to 90 minutes if the shutoff valves work and the old faucet comes off cleanly. The job is a four-step sequence: shut off the water, disconnect the supply lines and drain, pull the old faucet, then set the new one and test for leaks. If any of those steps stalls - a seized shutoff, a corroded nut, a cracked sink hole - stop and call a licensed plumber rather than forcing it.

This guide walks through the full process the way our technicians do it on service calls across Sioux Falls, including the tools that actually matter, what replacement costs in 2026, and the mistakes that turn a one-hour job into a flooded vanity.

How long does a bathroom faucet replacement take in Sioux Falls?

A straightforward bathroom faucet replacement in Sioux Falls takes 45 to 90 minutes for a DIYer and 30 to 60 minutes for a plumber. The clock starts when you open the vanity doors and ends when you have hot water running at the new fixture with no drips underneath.

Three things stretch that timeline. First, older homes - a lot of the housing stock around McKennan Park and the Whittier neighborhood dates to the 1920s through 1950s - often have shutoff valves that no longer close fully. Second, if the old faucet has been leaking into the countertop for months, the mounting nuts may be rusted solid. Third, if the sink has three holes and your new faucet uses one, you need a deck plate or a different faucet.

Budget the whole afternoon for your first one. Your second one will take half as long.

Tools and parts you need before you start

Gather everything before you shut the water off. Running to the hardware store mid-job with the supply lines open is how people end up with water on the floor.

You will need:

• Adjustable wrench and a basin wrench (the long T-handle tool that reaches the mounting nuts behind the sink)
• Phillips and flathead screwdrivers
• Bucket or shallow pan, plus old towels
• Plumber's tape (Teflon) and a small tube of silicone caulk
• New faucet, new supply lines, and a new drain assembly if yours is corroded
• Flashlight or headlamp - vanity cabinets are dark

Buy braided stainless supply lines rather than plastic. They cost $8 to $14 each at any Sioux Falls hardware store and they outlast the faucet. If you are replacing a faucet on a pedestal sink or a vessel bowl, add a basin wrench extension - the reach is longer than a standard vanity.

If your shutoff valves are the old multi-turn style and they weep when you turn them, that is a separate repair. Our team handles faucet installation Sioux Falls SD and can swap the valves at the same visit so you are not doing this twice.

Step-by-step bathroom faucet replacement

Work in this order and you will not have to backtrack. Each step assumes the previous one is complete.

1. Shut off the water and drain the lines

Close both shutoff valves under the sink - turn clockwise until snug. Open the faucet to confirm the water stops. If it does not, close the main shutoff for the house, usually in the basement or utility room.

Once the water is off, open the faucet handle to release pressure, then disconnect the supply lines from the shutoff valves. Have the bucket ready. Expect a cup or two of water from each line.

2. Disconnect the drain and supply lines

Disconnect the pop-up drain rod from the back of the faucet, then loosen the drain nut underneath with the basin wrench. Remove the drain assembly and set it aside. If the drain tailpiece is corroded, replace it now - a $12 part that saves a second trip.

Disconnect the hot and cold supply lines from the faucet inlets. If the nuts are frozen, apply a penetrating oil and wait ten minutes. Do not force them; a cracked inlet on a brass faucet body means the whole faucet is scrap.

3. Remove the old faucet

From underneath, loosen the mounting nuts that hold the faucet to the sink. On a standard vanity, these are two plastic or brass nuts on threaded shanks. Use the basin wrench - a regular wrench will not fit.

Once the nuts are off, lift the faucet out from above. If it is stuck to the countertop, run a putty knife around the base to break the old caulk seal. Clean the sink surface and the mounting holes before you go further.

4. Install the new faucet

Set the new faucet in place with the gasket or a thin bead of silicone under the base. Thread the mounting nuts from underneath and tighten them evenly - snug, not gorilla-tight. Over-tightening cracks porcelain sinks and deforms plastic mounting hardware.

Connect the new supply lines to the faucet inlets and to the shutoff valves. Wrap the threaded connections with plumber's tape. Hand-tighten, then a quarter turn with the wrench. Reinstall the drain assembly and reconnect the pop-up rod, adjusting the linkage so the stopper seals and opens fully.

5. Test for leaks

Turn the shutoff valves back on slowly. Open the faucet and let it run for a full minute - hot first, then cold. Check every connection underneath with a dry paper towel. Any moisture means a loose fitting; tighten a quarter turn and recheck.

Fill the sink, then pull the stopper and watch the drain connections. If the trap weeps, tighten the slip nuts by hand. Run the water for five minutes and check again. A dry paper towel after five minutes means you are done.

What does faucet replacement cost in Sioux Falls in 2026?

Typical 2026 pricing in Sioux Falls runs $150 to $450 for a plumber to supply and install a standard bathroom faucet, or $120 to $250 in labor if you supply the fixture. A high-end widespread faucet with a matching drain can push the parts cost past $300 on its own.

DIY cost is the faucet plus about $30 in parts - supply lines, tape, silicone. A mid-range bathroom faucet at a Sioux Falls retailer runs $60 to $180. A widespread faucet with separate handles runs $150 to $400.

What drives the price up on a service call is not the faucet - it is what we find underneath. Corroded shutoff valves, a rusted-out drain assembly, or a cracked sink all add labor. If you are also dealing with a slow drain in that bathroom, that is a separate issue and our drain cleaning Sioux Falls SD service handles it in the same visit.

Common mistakes to watch out for

The mistakes that cause the most damage are almost always about force and water pressure, not technique. Here is what we see on callbacks.

• Over-tightening the mounting nuts. Porcelain cracks. Plastic mounting hardware strips. Snug plus a quarter turn is enough.
• Skipping the supply line replacement. Reusing a 15-year-old plastic line under a new faucet is asking for a leak in six months.
• Not testing under full pressure. A connection that holds at a trickle may weep at full flow. Run both hot and cold wide open.
• Forcing a seized shutoff valve. If the handle will not turn, stop. Forcing it snaps the stem and you have water you cannot stop without the main shutoff.
• Ignoring a soft cabinet floor. If the vanity base is spongy from an old leak, the new faucet will not fix that. The leak detection and repair Sioux Falls SD work comes first.

One more: do not caulk around the base before you have tested for leaks. If you have to pull the faucet again, you will be scraping silicone for an hour.

When to call a professional

Call a plumber when the shutoff valves do not close, when a mounting nut is seized or stripped, when the sink itself is cracked, or when you have already replaced the faucet and it still drips. Those four situations are where DIY turns expensive.

We also get called when a homeowner starts the job and finds something worse underneath - a rotted vanity floor, a corroded drain line, or a shutoff valve that snaps off in their hand. Our team handles faucet repair Sioux Falls SD and full replacements, and we carry the common parts on the truck so most jobs finish in one visit.

If you are in an older home - say, a 1940s bungalow near Augustana or a mid-century ranch out toward the Tea exit - the plumbing behind the wall is often the real story. We check the shutoffs and the drain connections before we touch the faucet. That is what keeps a small job small.

For homeowners who want the work handled end to end, we offer Plumbing Sioux Falls SD across the whole metro, from a single faucet swap to a full bathroom rough-in.

Frequently Asked Questions

How do I replace a bathroom faucet in Sioux Falls SD?

Shut off both supply valves, drain the lines, disconnect the supply lines and drain, remove the mounting nuts with a basin wrench, lift out the old faucet, then set the new one, reconnect everything, and test under full pressure for five minutes. Plan 45 to 90 minutes.

What tools do I need to replace a bathroom faucet in Sioux Falls South Dakota?

An adjustable wrench, a basin wrench, Phillips and flathead screwdrivers, plumber's tape, silicone caulk, a bucket, and towels. Buy new braided stainless supply lines - $8 to $14 each - rather than reusing the old plastic ones.

How long does it take to replace a bathroom faucet in Sioux Falls?

Most homeowners finish in 45 to 90 minutes. A plumber typically completes the swap in 30 to 60 minutes. Add an hour if the shutoff valves need replacing or the old mounting hardware is corroded.

Should I hire a plumber to replace a bathroom faucet in Sioux Falls SD?

Hire a plumber if the shutoff valves do not close, a mounting nut is seized, the sink is cracked, or you have already tried and it still leaks. For a standard swap on working valves, DIY is reasonable and saves $120 to $250 in labor.

Can I replace just the faucet without replacing the sink?

Yes. The faucet mounts to the sink deck independently. Just match the hole configuration - a one-hole faucet needs a deck plate to cover a three-hole sink, and a widespread faucet needs three holes.

Get help with Plumbing in Sioux Falls

If your shutoff valves will not close, a nut is seized, or you would rather not spend your Saturday under a vanity, our licensed plumbers handle bathroom faucet replacement across Sioux Falls - usually in a single visit.

Call Emergency Plumbing Sioux Falls at +1 713-655-1138 and we will get your bathroom back to dry and working.