How to Install a Bathroom Faucet

Today I’m going to show you how to install a bathroom faucet without making an expensive call to a plumber. There are many types of bathroom faucets out there from single-hole and single handle faucets, to wall-mounted and bridge faucets. For this project I’ll be installing a wide-spread faucet on a drop-in sink. The sink you choose often dictates which type of new faucet you use so keep that in mind when you begin your project.

This particular faucet is a Moen Oxby widespread faucet which means the sink has 3 holes and the outer holes are more than 4” apart. The install principles will be the same with most widespread faucets. It can take a little patience, but the end product will be worth it. 

#1: Remove the Old Faucet

Once you have the proper style faucet for your sink, step #1 is to remove the old faucet (if you are replacing it with a new one). This is a newly remodeled bathroom so I don’t have an old one to remove in this case. Make sure you remove any old caulk or sealants as well as any old gaskets that may be present so you have a nice clean sink to work with. 

#2: Install the Spout and Handles

Next, install the faucet spout and stem assembly by applying some thread tape to the stem and threading it onto the spout assembly. Apply a small bead of plumbers putty around the base of the spout assembly and Insert the spout assembly into the center hole of the sink. Mount it in place with the included hardware kit and tighten it in place using the included valve socket wrench. 

Next, thread the mounting nut and mounting washer to the valve assemblies and apply a small bead of plumbers putty around the base of the upper washer. Insert the valves assemblies from the underside of the sink and secure them in place with a washer and retaining clip. Make sure the blue colored cold valve goes in the right hole and the red colored hot valve goes in the left hole. Tighten the mounting nuts from underside to tighten the valve in place.

From there, install the faucet handles by threading them onto the valve assemblies and tightening them by hand. 

Slide the lift rod into place in the hole in the backside of the faucet. Next you can start on installing the drain assembly.

#3: Starting the Drain Assembly

Unscrew the top of the drain assembly called a waste seat and apply a bead of plumbers putty around the underside before inserting it into the drain hole in the sink. Apply some thread tape onto the drain assembly and then thread it into the waste seat from the underside and tighten it down. Make sure the threaded hole that protrudes out on drain pipe is facing the back and tighten the drain nut to secure it and the gasket in place making it water tight. You should have some squeeze out of plumbers putty in the sink itself which you can simply wipe away. 

From there you can move onto attaching the lift rod and the sink plug. Add some thread tape to the hole on the backside of the drain assembly, slide the locking nut over the ball rod, and insert it into the hole. Tighten the nut as much as possible by hand. Attach the lift strap to the lift rod and the ball rod and secure it in place with the locking clamp and tighten the screw on the lift rod. You can adjust how the lift rod operates by sliding it up and down the holes on the strapping. Make sure it works for you and then move on to installing the water lines. 

#4: Finishing the Drain Assembly and Water Lines

Attach the diverter hose by snapping the ends over the valve bodies, and the faucet stem assembly. You’ll know they’re seated properly when you hear a click. 

Assemble the P trap assembly by sliding the washer and slip nut over the end of the joint elbow, and wrap the thread in thread tape. Connect the trap, and elbow by tightening the nut by hand. Add the down pipe to the drain assembly by sliding the slip nut and washer over the drain assembly, and slide the trap assembly into the drain pipe in the wall. Once you have everything aligned, tighten the slip nuts at each joint by hand before snugging them up with a pair of channel lock pliers. 

Install your water lines from the valves and connect them to the new valves on the faucet. And lastly, turn the water on at the valves, check to see that the faucet is working properly, and check the drain assembly for any leaks. If you have a small leak, try tightening the nuts further with your pliers. And that’s it, you are done with this project. 

I hope you guys enjoyed this project and I hope you learned something. Plumbing projects can take a little bit to get used to and obviously each faucet is a little different but once you get the hang of the basics, installing a new faucet is definitely something most homeowners can tackle on their own. 

As always I encourage you to leave me a comment down below and let me know what you thought of the project and what type of project you’d like to see me tackle next. If you liked this project, check out my tutorial on unclogging a bathroom sink. Thank you for stopping by, and I’ll see you next time!