Vigo Davidson Single-Hole Bathroom Faucet The single-hole design of this Vigo faucet is convenient to install and takes up just 1 3/4 inches of space on your sink. It’s compact for smaller ...

So if you have a three-hole sink with the outside holes 4 inches apart, you should be able to install a single-handle bathroom faucet. However, a deck plate to cover all the holes is usually needed.