How to Choose a Bathroom Sink Faucet: 3-Hole Buying Guide

Match the sink’s hole count and spread: 3 holes at 4 inches take a centerset faucet, and 3 holes at 8 to 16 inches take a widespread model.

One wrong measurement sends a faucet back in a box — the difference between a 4-inch and an 8-inch spread is what decides whether the new fixture drops onto the deck or sits in it. Whether a centerset or widespread faucet fits your bathroom sink comes down to two numbers you can read with a tape measure in under a minute, plus a few under-sink details most buyers only discover after the box is open.

Measure The Hole Spread Before Anything Else

Faucet shopping starts under the sink, not in the aisle. Measure center-to-center — from the middle of the left hole to the middle of the right hole — because that number, not the sink’s overall width, determines which faucets fit.

Kohler’s buying guide frames the decision this way: hole count and hole spacing come first, style second. Three holes at 4 inches is the classic centerset pattern. Three holes spaced 8 to 16 inches apart is the widespread pattern. Measuring from the hole edges instead of the centers is the single most common mistake, and it produces a number that fits nothing on the shelf.

While you’re down there, check the hole diameter. A minimum hole size of 1-3/8 in. (35 mm) is listed for a 3-hole faucet installation, and requirements vary by model, so confirm the spec sheet before buying.

Which Faucet Type Fits Your Sink?

For a 3-hole sink, centerset faucets fit 4-inch spreads, widespread faucets fit 8-to-16-inch spreads, and a single-hole faucet with a deck plate can cover the two unused holes if the plate is sized to the sink deck.

Centerset models remain the compact, budget-friendly pick because the spout and both handles sit on one base plate. Widespread faucets separate the spout from each handle, which spreads across the wider holes and leaves more room to wipe down the deck. The single-hole plus deck plate route works, but the faucet body and plate must be sized to your actual sink deck and hole pattern — a mismatched plate leaves gaps a drop of water will find.

If you’d rather compare specific fixtures side by side before committing, our tested roundup of the best 3-hole bathroom sink faucets covers models by spread and finish.

Install It Without Flooding The Vanity

Installation runs in a fixed order: shut off both supply valves, open the old faucet to release pressure, remove it, clean the mounting surface, set the new faucet, and reconnect the lines.

The details that trip people up happen before the new faucet goes in. Check the underside of the sink for room to fit mounting hardware, supply lines, and any pull-down hose weight — a deep sink bowl on a shallow cabinet leaves less space than expected. Countertop and sink deck thickness matters too, since the mounting hardware only has so much thread to grab.

Hot water connects to the left and cold to the right. Getting that backward is a two-minute fix, but it’s easier to route correctly the first time. In older cabinets with limited hand room, thread the supply lines through the faucet body before you seat it against the sink.

Once everything is tight, turn the water back on and check every connection point for leaks, including the supply line nuts and the faucet base. A dry paper towel wiped along each joint tells you in seconds. Home Depot’s installation walkthrough covers the same order if you want the step sequence beside you while you work.

Frequently Asked Questions

Can I put a widespread faucet on a 4-inch sink?

No. Widespread faucets are built for 3 holes spaced 8 to 16 inches apart, so the handle bases won’t line up with a 4-inch pattern. A 4-inch sink needs a centerset or mini-widespread faucet instead.

How do I measure if I only have two of the three holes open?

Measure from the center of one open hole to the center of the other. If only the outer holes are exposed, that distance is still your spread; a single-hole faucet with a deck plate can cover the third if you prefer that look.

Do I need to shut off the whole house to replace a faucet?

No. The shutoff valves under the sink stop water to that fixture alone. Close both, then open the old faucet to drain pressure before you start removing anything.