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Yes, you can replace just the top of a bathroom vanity, which you may choose to do if you love the look of your vintage bathroom cabinets, but the countertops are not your style. Fortunately, it is pretty simple to detach a vanity top from a base for replacement, but you should still shut off the water to avoid a leak. Replacing only the vanity top costs around $400 to $4,300.

When installing an undermount kitchen sink in a granite countertop, use 100% silicone to secure the basin. If you’re worried your sink is too heavy, speak with a countertop professional about how to adhere the sink to the countertop without worrying about issues down the road. Sagging undermount sinks can be a common plumbing problem if they’re not properly adhered, so always make sure you’re using a high-quality material.

For safety when installing a vanity, attaching the vanity to the wall is ideal to prevent it from moving. Typically, sinks must be 4 inches away from bathtubs. Also, most states require that you have 21 inches in front of a sink, but the National Kitchen and Bath Association (NKBA) recommends 30 inches for more comfort.

If you find moisture under your sink, you can clean up the worst of it with paper towels or regular towels. Then, leave the cabinet doors open to allow air circulation. You can also place a fan or dehumidifier near the cabinet to help dry it out a little quicker.