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Begin by clearing everything from under the sink. Place a bucket under the P-trap to catch any residual water. Turn off the hot and cold water supply by turning the handles on the shutoff valves clockwise until they stop. Turn the faucet on to release any remaining pressure and confirm the water is off. Use an adjustable wrench to disconnect the supply lines from the shutoff valves. Next, use channel-lock pliers to loosen the slip nuts on the P-trap assembly and remove it. Use a utility knife to carefully cut the caulk seal between the old sink rim and the countertop. From underneath, locate and loosen the mounting clips holding the sink in place, if any. Finally, carefully push up on the sink from below and lift it out of the countertop. Clean any old caulk or putty off the countertop with a putty knife and a cleaning solvent.

You're viewing a step from: How to Install a Bathroom Sink and Faucet from Start to Finish

Beginner

30 minutes

2/4 Inventory

This guide provides comprehensive, step-by-step instructions for removing an old bathroom sink and installing a new drop-in sink and centerset faucet. The process covers shutting off the water supply, disconnecting plumbing, preparing the countertop, installing the faucet and drain onto the new sink, setting the sink in place, and connecting all new plumbing before testing for leaks.

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Frequently Asked Questions

How difficult is this bathroom sink and faucet installation for a beginner, and how much time should I set aside?

This project is categorized as 'beginner' difficulty, making it very approachable for DIYers. For a first-timer, plan to dedicate 4-6 hours from start to finish, including preparation and cleanup. Rushing can lead to mistakes, so allow extra time for unexpected issues.

What are the most critical safety steps I need to take before starting to remove the old sink and work on plumbing?

The absolute most critical step is to shut off the water supply to the sink, either at the shut-off valves under the sink or the main water supply to your house. Also, place a bucket and towels under the work area to catch any residual water, and consider wearing safety glasses when using tools or working with pipes.

Is a basin wrench, like the TEKTON WRN92004, truly necessary for this project, or can I use regular pliers?

While you might be able to manage with large channel-lock pliers in some cases, a basin wrench (e.g., TEKTON WRN92004) is highly recommended. It's specifically designed for reaching and loosening the difficult-to-access mounting nuts on faucets, especially in tight spaces, making the job significantly easier and faster.

What's the most common mistake beginners make when installing the drain assembly or sealing the sink, and how can I avoid it?

A common mistake is either not using enough plumber's putty (like Oatey 14 oz. Plumber's Putty) around the drain flange, or over-tightening plastic drain fittings, which can crack them. Ensure a generous, even ring of putty under the drain flange for a watertight seal, and hand-tighten plastic connections, then give a quarter-turn with pliers, being careful not to overtighten.