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Yes, it is often possible to replace an undermount sink without removing the countertop, but success can depend on the countertop material. For materials like granite, the process is relatively straightforward. However, laminate or uniquely shaped countertops might need to be removed or modified.

The process typically involves shutting off the water supply, disconnecting the drain and plumbing pipes, cutting through the old silicone seal, and carefully lowering the sink from below. This requires a good understanding of plumbing and the right tools. If you are not confident in performing the replacement yourself, it is recommended to hire a countertop specialist or a plumber to handle the task.

You’ll only need to replace your sink’s pipes when you start to notice signs of wear like corrosion or leaking. Most pipes last somewhere between 20 and 100 years, depending on the material. Copper and cast iron can last up to 100 years. Galvanized steel and brass generally have a 50-year lifespan. PVC pipes last 25 to 40 years.

The biggest sign that your flange leaks is if you notice water at the base of the toilet. The cause is likely due to a poor flange installation, so you might have issues with loose bolts, an uneven flange, or a cracked plastic flange. Add a deteriorating wax seal to this, and you have a recipe for disaster. The best solution is to shut off the water valve, replace the toilet flange, and seal it with a new wax ring.

It is best practice to hire a plumber to install a bathroom sink and vanity. Even simple installations require basic plumbing work, such as connecting water supply lines and attaching the sink to the drainage system. While an experienced DIYer might manage a straightforward setup, any complex work, like modifying existing plumbing or installing new lines, should always be left to a licensed plumber to avoid the risk of expensive water damage. In most cases, a plumber will handle the installation, provided it is a straightforward job that does not require custom carpentry. It's important to outline your expectations with the plumber beforehand to confirm they can handle the full project.