Replacing a kitchen faucet is one of those repairs that looks simple from above the counter and gets more technical the moment you kneel under the sink. I like this job because it rewards patience more than strength: if the fit is right, the shutoffs work, and the connections are sealed correctly, the new fixture goes in cleanly and stays dry. This guide covers the practical sequence, the parts that matter, the mistakes that create leaks, and the cost range you should expect in a U.S. kitchen.
Key points before you start
- Measure the sink holes first. Hole spacing and faucet style have to match, or you will end up forcing a bad fit.
- Shut off water and power before anything comes apart. Open the faucet after closing the valves so pressure bleeds off safely.
- Plan on flexible supply lines and the right connectors. The shutoff side is often 3/8-inch compression in U.S. kitchens, but the faucet end varies by brand.
- Keep a basin wrench and bucket within reach. Tight cabinet access is what usually turns a quick swap into a frustrating one.
- Expect about 1 to 2 hours for a straightforward replacement. Corroded nuts, worn valves, or cramped access can push that longer.
Match the faucet to the sink layout before you buy anything
The biggest mistake I see is buying a faucet for the finish and ignoring the hole pattern. In U.S. kitchens, the sink usually dictates the format: one hole, two holes, three holes, or four if there is a sprayer or soap dispenser. The distance between the hole centers is the spread, and that number matters more than the style photo on the box.
| Sink layout | What it means | What usually fits best |
|---|---|---|
| Single-hole | One opening in the deck or sink | Single-handle faucet, often a pull-down model |
| Three-hole | Common on older sinks, sometimes with a sprayer or accessory hole | Single-hole faucet with a deck plate, or a faucet built for that spread |
| Eight-inch spread | Separate handle and spout placement measured center to center | Widespread or other faucet made for the same spacing |
| Four-hole setup | Extra opening for a sprayer, soap dispenser, or filtration accessory | Faucet kit that includes the accessory, or a deck plate to cover unused openings |
My rule is simple: measure center to center, not edge to edge, and do it before you shop. If you want a single-hole faucet but your sink has three openings, a deck plate usually solves the cosmetic problem. If the new faucet needs a wider spread than the sink offers, there is no elegant workaround. Once the fit is right, the actual swap becomes much easier.
The actual swap works best as a clean sequence
I treat this as a sequence job, not a brute-force job. If you work in order, the risk of breaking a valve, stripping a nut, or flooding the cabinet drops fast. I also take a quick photo of the plumbing before disconnecting anything, which is the same habit Lowe's recommends because the under-sink layout never looks as obvious when you are putting it back together.
- Clear the cabinet and shut everything down. Remove cleaners and supplies from under the sink, put down towels, and set a small bucket nearby. Turn off the hot and cold shutoff valves. If there is a garbage disposal or outlet under the sink, cut power to it as well. Then open the faucet handles to release pressure in the lines.
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Disconnect the supply lines. Loosen the nuts at the shutoff valves and catch the remaining water in the bucket. Hold the valve body steady while you work so you do not stress the pipe behind the cabinet. If the lines are stiff or corroded, stop and inspect them instead of forcing the connection.
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Remove the mounting hardware. A basin wrench is the tool that saves this job. It reaches the retaining nuts that are almost impossible to grab by hand. If the old hardware is rusted, a penetrating oil can help, but give it time to soak before you try again.
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Lift out the old faucet and clean the deck. Once the mounting hardware is off, the faucet should come free. If old caulk or putty is holding it down, break that seal gently. Clean the sink surface thoroughly so the new gasket or deck plate sits flat.
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Dry-fit the new faucet first. Feed the new lines through the hole or holes before you tighten anything. If the faucet comes with an escutcheon plate, use it only when the layout needs it. On three-hole sinks, the plate covers the unused openings and helps seal the top surface.
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Secure the faucet from below. Tighten the mounting nut and screws evenly so the faucet sits centered and does not twist. Pull-down faucets also need the hose weight installed with enough clearance to move freely under the sink. If the weight hits the trap or cabinet wall, the hose will not retract properly.
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Reconnect the water and test slowly. Attach the supply lines, then reopen the shutoff valves gradually. If the faucet uses threaded male pipe threads, wrap PTFE tape clockwise, starting a thread or two back from the end. Do not use tape on compression fittings. Run both hot and cold water, then check every joint with a dry paper towel.
That process sounds long on paper, but a good replacement is mostly about discipline. Once the old faucet is out, the rest is assembly work. The final leak test is where you either finish cleanly or discover the next problem before it becomes a wet cabinet.
The small parts that decide whether it holds or leaks
The faucet finish gets all the attention, but the small parts decide whether the installation lasts. I spend most of my mental energy on the hardware nobody sees after the job is done. If any one of these items is wrong, the repair can look finished and still fail later.
| Part | What to check | Why it matters |
|---|---|---|
| Supply lines | Length, connector type, and condition | Too short strains the fit; too long invites kinks or messy looping |
| Shutoff valves | That they close fully and reopen smoothly | A weak valve can turn a faucet swap into a larger plumbing repair |
| Deck plate or gasket | Whether it matches the hole pattern and seals flat | It hides unused holes and keeps water from sneaking under the fixture |
| Basin wrench | Enough reach to grab the retaining nuts | It is the difference between a controlled removal and a miserable one |
| PTFE tape | Use only on threaded male pipe threads, not compression joints | Wrong placement can actually create leaks instead of fixing them |
| Pull-down weight | Free swing under the sink | If it binds, the hose will not retract cleanly |
For most U.S. kitchen setups, the shutoff side is commonly 3/8-inch compression, but the faucet end is brand-specific. Some faucets include built-in hoses or PEX-style lines, while others need separate braided connectors. My advice is blunt: buy the faucet, read the spec sheet, then buy the lines that match the exact connection pattern. That order prevents a lot of pointless returns.
The mistakes I see most often on kitchen faucet swaps
Most failed installs are not dramatic. They are small, preventable errors that compound under pressure. Once you know where the job usually goes sideways, you can avoid them without overthinking the rest.
- Buying before measuring. The finish can be perfect and the fit can still be wrong. Hole spread and deck clearance come first.
- Reusing tired supply lines. If the old lines are stiff, corroded, or too short, replace them. Saving a few dollars here is rarely worth a callback.
- Overtightening compression nuts. A snug connection is enough. Cranking harder can deform the fitting or make the leak worse.
- Using PTFE tape where it does not belong. Tape belongs on tapered threaded connections, not on compression fittings that seal metal-to-metal.
- Forgetting power to the disposal or outlet. Under-sink work is cramped enough without a live appliance in the way.
- Skipping the cleanup under the old faucet. Old putty and buildup keep the new gasket from sitting flat, which is how slow leaks begin.
- Ignoring pull-down hose clearance. A hose weight that hits plumbing or cabinetry will make the faucet feel broken even when it is installed correctly.
- Stopping after the first dry test. Some leaks show up after pressure settles or after the hose moves a few times.
The best part of this repair is that the mistakes are easy to identify if you slow down long enough to look. That brings the cost question into focus, because the real decision is not whether the faucet can be installed, but whether your sink area is friendly enough to justify doing it yourself.
What the job usually costs in the U.S. and when I would hire help
For 2026, a basic professional kitchen faucet replacement is not a trivial line item. Homewyse puts a typical national estimate at about $539 to $861 per faucet for a full replacement, with installation-only estimates around $467 to $773, depending on site conditions and options. A popular single-handle pull-down faucet itself often lands around $212 to $465 before you add lines, hardware, or premium features.
| Option | Typical outlay | Best when |
|---|---|---|
| DIY replacement | Faucet cost plus small parts, often well under a few hundred dollars if the faucet is basic | The shutoff valves work, the cabinet is accessible, and the sink layout already matches |
| Hire a plumber | About $467 to $773 for installation-only, or $539 to $861 for a full replacement estimate | The old faucet is seized, the valves are suspect, or access under the sink is cramped |
The last checks I would not skip
The faucet is not really done when it is bolted in. It is done when it has survived a slow, careful test and stayed dry long enough to prove the seals are holding. I always run through the same short checklist before I call the job finished.
- Run cold water first, then hot, then both together.
- Move the spray head or pull-down hose several times so you can see whether the hose tracks smoothly.
- Wipe every connection with a dry paper towel and look for dampness, not just dripping.
- Check underneath again after 10 to 15 minutes, then once more later in the day.
- Look at the cabinet floor the next morning, because slow leaks often show up there first.
A kitchen faucet replacement goes well when the fit is correct, the water is shut off cleanly, and every connection is tightened with restraint instead of force. If you keep those three ideas in view, the new fixture feels like a proper upgrade rather than a plumbing gamble, and that is exactly the result I would want in my own kitchen.
