The first step in this easy renovation is toremove the old vanity, which takes less than an hour.

Installing a new vanity is easiest with a unit that includes a countertop with an integrated sink.

The vanity cabinet is separate from the top.

Newly installed bathroom vanity with white countertop and single sink

The Spruce / Kevin Norris

Once the cabinet is secured, the countertop-sink unit is dropped in, usually with the faucet pre-installed.

The final step is making the water supply and drain connections.

Some vanity sets include a separate backsplash piece.

bathroom vanity and tub

Ann Marie Kurtz / Getty Images

This is typically installed with caulk or adhesive after the countertop is secured.

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Mark the center of the stud.

Materials and tools to replace and install a bathroom vanity

The Spruce / Kevin Norris

If the vanity is boxed in by a sidewall, also find the wall studs in the sidewall.

Use a level to draw a straight line at the marked height.

Place the vanity cabinet into position.

Electronic stud finder placed on light blue wall to find wall stud

The Spruce / Kevin Norris

Confirm that the cabinet is level both side-to-side and front-to-back using the line you drew.

If necessary, use wood shims slipped under the cabinet to level it.

If there is a sidewall, you will fasten that to the wall after fitting a filler strip.

Wood shim placed under new cabinet to level

The Spruce / Kevin Norris

Cut out the profile with a coping saw or jigsaw.

Test-fit the filler strip and adjust as necessary.

Sand and finish the wood strip to match the base cabinet.

Side of vanity cabinet fasted to wall with wood shims and spacer blocks

The Spruce / Kevin Norris

Some vanity kits come with filler strips made of the same material as the cabinet.

Place two wood shims between the wood spacer blocks and the wall.

This will draw the side of the cabinet snug against your spacing blocks and shims.

Vanity top installed on cabinet with sink attached

The Spruce / Kevin Norris

Place a small amount of construction adhesive onto the top corners of the cabinet.

Set the countertop/sink assembly in place onto the cabinet so it overhangs evenly on all exposed sides.

Some vanity kits come with brackets that screw to the bottom of the countertop from beneath the sink.

Water supply lines connected to bottom of sink faucet and drain

The Spruce / Kevin Norris

Use these in addition to the construction adhesive if they were included.

Caulk the Joints

Apply a bead of silicone caulkwhere the countertop meets the wall.

Let the caulk cure for 24 hours before using the vanity.

White backsplash installed behind sink faucet with construction adhesive

The Spruce / Kevin Norris

Caulk applied to vanity and backsplash joints

The Spruce / Kevin Norris