This article has been viewed 148,450 times. The national average cost to repair a sink or faucet is $194. If you can’t figure out where a leak is coming from and/or how to fix it, shut off the water supply lines and call a plumber. Work slowly and carefully so you don’t cut into the countertop, especially if it’s made of laminated wood. Do I need to configure this or install without clips? Bathroom vs. kitchen sinks. Use a plastic putty knife for scraping, then clean up any residue with a rag dipped in mineral spirits. What you do know is the leaking has to stop. For starters measure the bathroom sink for its length, width, and depth. Then, install the faucet and drain on the new sink and apply silicone caulk to the underside of the new sink’s rim. line to drain the sink. For a complete update, replace the sink, countertop and faucet the same time as the vanity cabinet. Preparing the Old Sink and Buying the New One, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/20\/Replace-a-Bathroom-Sink-Step-1-Version-3.jpg\/v4-460px-Replace-a-Bathroom-Sink-Step-1-Version-3.jpg","bigUrl":"\/images\/thumb\/2\/20\/Replace-a-Bathroom-Sink-Step-1-Version-3.jpg\/aid1358075-v4-728px-Replace-a-Bathroom-Sink-Step-1-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"