Project Guide

How to Install a Bathroom Vanity

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Measure the Area
A person measures the vanity area.

Before replacing your bathroom vanity, measure your space to ensure that you buy the right size vanity.

Tip:  Double vanity installation requires more space and plumbing considerations. Consult manufacturer's instructions for details. If you're installing a bathroom vanity with top, include the countertop in your measurements. 

Choose Your New Vanity and Faucet
A blue bath vanity with open drawers.

With so many types of bathroom vanities to choose from, it’s important to decide if you prefer a vanity with or without an attached top and whether or not a bathroom faucet is included. From Carrara marble to granite and laminate, it’s important to choose the countertop material that works best for your lifestyle. Think of durability (granite and marble), style and your family’s needs while making your decision.


Tip: When shopping for a bathroom vanity, focus on the style of the counter. Hardware can be quickly and easily changed out to match your decor style.

Remove the Old Vanity
A person holding a vanity top for a new bathroom vanity.

An important step in learning how to install a bathroom vanity is understanding how to install bathroom vanity plumbing. This next step will guide you through the plumbing details. 

  • When removing a bathroom vanity, begin by locating the water shut-off valves, typically under the sink, and turning off the water supply. If your valves are not located underneath the sink, be sure to turn off the main water valve. Once the water is off, quickly turn the faucets on to alleviate any water pressure built up in the pipes.  
  • Place a small bucket under the tubes to catch any water. Using an adjustable wrench, loosen the slip nut, or mounting nut, at the top of the P-trap (the drain pipes, named for the shape they make).
  • Next, using the same wrench, disconnect the water supply lines. 
  • Use a utility knife to cut the sealant along the backsplash and carefully pull on the sink or vanity top to remove it from the wall. 
  • Remove the sink top from the vanity base. Some tops use glue or brackets to adhere to the vanity top, so you may need to use your prybar to release the sink top from the base.   
  • Finally, use your drill to take the screws at the base of the vanity out and remove it from the wall.
  • Check with your local recycling and trash collection to be sure you dispose of your old vanity properly. 
Install the New Vanity
A man installing plumbing connections under a new vanity.
  • Position the new vanity into place and trace its outline on the wall.
  • Use a stud finder to locate the studs and mark them. 
  • Level the vanity and shim at the floor if necessary.
  • Measure, mark and drill holes for drain and supply pipes.

Tip: Some vanities will come with pre-drilled holes for easier installation. Always follow the manufacturer’s directions for installing a bathroom vanity. 

Attach To the Wall
A man installing parts under the sink of a bathroom vanity.
  • Attach the vanity to the wall using 3-inch drywall screws. If the holes are not completely lining up, or you want a more secure install, use wall anchors to attach the vanity to the wall. 
  • Check the level again before trimming the shims with a utility knife. 
  • If there are large gaps at the wall or floor, attach quarter-round moulding along the wall or floor edge with finishing nails.
Install the Faucet
A person attaches a faucet to a vanity.
  • Assemble the bathroom faucet and drain on the sink before you attach it to the vanity. 
  • Place the plastic gasket on the faucet. Then, while holding the faucet from underneath, screw on fastening nuts. 
  • Insert the faucet into the designated holes on the vanity top. 
  • Attach water supply lines to the new faucet with an adjustable wrench. 


Tip: Some vanities will come with a built-in faucet. Follow the manufacturer’s instructions and install and secure the bath faucet to the vanity top.

Secure the Vanity Top
A man secures a vanity in a bathroom.

If you have chosen a bathroom vanity base, or a vanity without an attached top, you will need to dry-fit the vanity top over the vanity. Be sure to follow the manufacturer’s instructions to secure the vanity top to the vanity. 

  • Make sure the wall is straight and there are no gaps between the wall and vanity. 
  • Apply silicone caulk to the top of the cabinet.
  • Set the vanity top into position and firmly press down. 
  • Check to make sure the vanity top is level and flush to the wall. If your vanity does not come with adjustable legs, use shims under the base until vanity is level on each side.
  • Add backsplash if necessary.
Reconnect the Water Supply
Someone reconnecting the water supply under a sink.
  • Reconnect the faucet supply lines to the water supply and reconnect the P-trap. 
  • Turn on the water supply and test for leaks. 
  • Install the pop-up drain.

When replacing a bathroom vanity, it's important to find the style that works for you. Shop our entire selection of bathroom vanities to discover your perfect design. If you're ready for a new bathroom vanity but aren't ready to install it yourself, let our professional bathroom installation services do it for you.