Installing a new bathroom remodeling vanity is one of the most satisfying DIY projects. It can completely transform your space while boosting functionality and resale value. Whether you’re replacing an outdated cabinet or upgrading to a double sink, this guide walks you through how to install a new vanity yourself—step by step.

???? Tools & Materials You’ll Need

• New vanity and countertop

• Adjustable wrench

• Screwdriver or drill

• Utility knife

• Silicone caulk and caulking gun

• Plumber’s putty

• Level

• Measuring tape

• Bucket and towels (for water lines)

• Supply lines and P-trap (if needed)

• Shims (for leveling)

✅ Step-by-Step Guide: How to Install a New Bathroom Vanity

Step 1: Shut Off the Water Supply

Before removing the old vanity, turn off the water valves under the sink. Open the faucet to release any remaining water.

Pro Tip: Place a bucket and towels under the supply lines to catch any drips.

Step 2: Disconnect Plumbing

Use an adjustable wrench to disconnect the water lines and P-trap (the curved drain pipe). If they’re old or corroded, consider replacing them.

Step 3: Remove the Old Vanity

• Cut any caulk sealing the vanity to the wall with a utility knife

• Unscrew the vanity from the wall

• Carefully pull it away and patch any wall damage before installing the new one

Step 4: Measure and Mark for the New Vanity

Use a tape measure and level to mark where the new vanity will sit. This ensures proper placement for plumbing connections and mounting screws.

Tip: Dry-fit the vanity first to make sure it aligns with your plumbing.

Step 5: Level and Anchor the Vanity

Place the new vanity in position. Use shims under the base if your floor isn’t level. Check alignment with a level on all sides.

Once it’s perfectly level:

• Screw the vanity into wall studs (use wall anchors if needed)

• Don’t overtighten—just enough to hold it firmly

Step 6: Install the Countertop and Sink

If the countertop isn’t pre-attached:

• Apply a thin bead of silicone caulk along the top of the vanity

• Gently place the countertop and press it into place

• Wipe away any excess caulk

Let it cure as directed (usually 24 hours).

Step 7: Reconnect Plumbing

• Attach the faucet and drain assembly to the sink (use plumber’s putty where needed)

• Reconnect water supply lines and the P-trap

• Turn on the water and check for leaks

Important:
Tighten fittings just enough—don’t overtighten, which could crack plastic parts or damage threads.

Step 8: Seal the Edges

Run a thin line of bathroom-grade silicone caulk along the back edge where the vanity meets the wall and around the sink if needed.

This keeps water from seeping behind your vanity.

???? Bonus Tips for a Pro-Quality Vanity Install

• Match plumbing height: Make sure your vanity height works with existing plumbing or be prepared to adjust

• Choose a pre-assembled vanity for easier installation

• Install a backsplash if your countertop doesn’t include one

• Upgrade the faucet while you’re at it—it’s an easy win

???? Your Vanity, Your Style

Replacing your bathroom vanity is more than a cosmetic fix—it’s a functional upgrade that can make your bathroom feel more modern, organized, and valuable. With a little time and the right tools, you can confidently complete this project and enjoy the results for years to come.