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Yes, you can install a farmhouse sink on an existing countertop—but there are some caveats. You’ll need to precisely measure. It’s best to choose a sink that’s the same dimensions as your existing sink, since your contractor won’t have to cut the countertop. Otherwise, pay close attention to the depth of your counter (the front to back measurement). You don’t want to install something that’s so big it sticks out beyond your countertop and cabinetry.

Today’s standard sink stopper size is 1.5 inches. However, you can still find different sizes if your house uses an older sink stopper. Other sizes you can find in most hardware stores include one inch, 1-1/4 inch, 1-3/8 inch, 1-5/8 inch, 1-7/8 inch, 2 inch, 2-1/4 inch, 2-3/8 inch, and 2.5 inch.

Hairline cracks—tiny cracks in the surface—in porcelain sinks can happen due to age, chemical damage from cleaning products, dropping heavy objects on the sink, thermal shock from drastic temperature changes, stress during repairs, and manufacturing errors. Hairline cracks often start very small and grow longer and wider over time. While they may appear problematic, hairline cracks don’t indicate structural problems and may not impact the performance of sinks. However, they can eventually cause water leaks and mold growth if left to grow.

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.