Yes, you can fit a vanity unit to an existing sink, especially if you plan to custom-build the vanity. With a prefabricated vanity, you’ll likely need to make a few adjustments. It depends on the type of sink, the size of the sink, and the existing plumbing. If you plan to retrofit a sink into a prefabricated vanity, make sure you take precise measurements and that your sink is compatible with the vanity you select. Prefabricated units have a precut sink hole, so you’ll need the size to match your sink.

You’ll need a backsplash behind your pedestal sink in your bathroom. Because pedestal sinks mount directly to the wall and usually have smaller basins with narrow rims, it’s easier to splash and get water on the wall or floor. You’re better off having a backsplash while brushing your teeth or washing your hands. 

Deteriorated seals, O-rings, or gaskets are common culprits behind a leaky sink after you’ve turned off the water—especially if your sink is older than 15 years. Inspect each of these mechanisms in your sink for signs of corrosion or looseness, then replace the worn-out part to fix it. Older sinks may be worth replacing if several of the parts are worn-out.

The average cost to hire a plumber is typically between $45 and $200 per hour, with a common average rate around $125 per hour. This cost can vary based on your location, the plumber's experience, and the complexity of the job. Rates are often broken down by experience level: an apprentice may charge $45 to $90 an hour, a journeyman $60 to $110 an hour, and a master plumber $80 to $200 an hour. While hourly rates are standard, some plumbers may charge a flat fee for routine projects or offer project-based pricing. It's also common for plumbers to charge a minimum service or trip fee. For reference, some typical flat-rate costs for common jobs include: drain unclogging ($220), leaky faucet repair ($270), burst pipe repair ($400), toilet repair ($300), and water heater repair ($600). Note that these rates are for standard service hours; emergency, holiday, and after-hours calls will cost significantly more.