Finish the wall and install the faucet trim, according to the installation instructions. About the Experts Simone Bumpus is a design specialist for Kitchens by Good Guys in Scottsdale, Arizona.

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.