Summary
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What size undermount kitchen sink fits in a thirty inch cabinet? It's hard to decide! There are two main types: undermount and overmount. Undermount sinks, of course, have to be mounted under the counter. They need approximately three inches of extra space on each side of the opening. A drop-in sink, on the other hand, doesn't have any extra space. So if you want to install one in your cabinet, be sure to measure carefully.
