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First, shut off the water lines and disconnect the supply lines to the sink. Use a bucket to catch water from the supply line and p-trap. Loosen and remove the p-trap (the center part of the curved pipe).
Use a utility knife to loosen the caulk between the vanity and the wall. Rock the vanity carefully to loosen and remove it without risking damage to the surrounding wall.
Use a cordless screwdriver to carefully remove screws that attach the vanity to the wall. Remove the old vanity and move it out of the way.
Tip: When replacing vanity, replace the sink and countertop to match the new.
Locate the wall studs that will be used to anchor the new vanity and mark the studs with pencil. Make the marks slightly higher than the new vanity top.
Position the vanity and make sure it is flush against both walls. Use shims and a carpenter's level to assist with placement and make sure the vanity is even.
Locate the wall studs and drive 2-1/2" wall board screws to anchor the vanity to the wall.
Tip: If you haven't been able to locate a wall stud, be sure to use wall anchors.
Note: You might consider adding a new faucet to match the new vanity, sink and countertop. If you decide on a new style, be sure to install the new faucet before installing the new vanity top.
Apply tub and tile caulk to secure the vanity top to the vanity. Position the countertop on the vanity.