Update Your Vanity TopStep 1
Measure the vanity base with a tape measure and write down the measurements. Buy your new vanity top according to these measurements. The vanity top you choose will depend on the space available and your personal taste. Some vanity tops have the sink bowl built in, while others have an opening cut out, ready to accept the sink bowl of your choice.
Turn off the main water supply to the bathroom.
Disconnect the drain pipes from the existing sink unit using a pipe wrench. Then disconnect the supply lines from the existing faucet assembly on the sink using an adjustable wrench.
Reach inside the vanity base and use a screwdriver to remove the securing clips holding the vanity top in place. Lift the old vanity top from the sink base and set it aside.
Check existing drain pipes and water supply lines for damage. Replace them if necessary before you begin installing the new vanity unit.
Place a level on the top edges of the vanity base and check that it's level from side to side and front to back. Place shims under the vanity base as necessary to make the unit level. Cut off excess shims using a utility knife so that it's even with the side of the base.
Place the top on the vanity base and center it. Secure the top to the base using a screwdriver and the hardware that came with the vanity. Install the new faucet assembly on the vanity top following the manufacturer's instructions for the brand and model you're using.
Connect the water supply lines to the new faucet assembly and tighten the fittings with an adjustable wrench. Connect the tailpiece on the sink to the drain pipe, and tighten the locking collar using an adjustable wrench.
Don't overtighten the collar because you may damage the drain pipe or sink bowl.
Place a bead of caulk around the edges of the vanity top using the caulking gun. If your bath vanity top has a separate sink bowl, place a bead of caulk around the edges of the sink bowl as well. This will prevent water from leaking onto the vanity top and damaging it.
Turn on the bathroom water supply. Run water into the sink bowl and check the drain pipes and water supply lines for leaks.
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