The cabinet sides are 3/4" so the inside measurement is 28 1/2" on a 30" sink and likewise, 22 1/2" on a 24" sink. Bear in mind that some of the granite/solid surface installers are accustomed to installing the sink under the granite after it's been installed, requiring that the entire sink, including the flanges be less than the interior width of the cabinet.
However, it is also possible to buy a sink where the flanges are up to 30" (using a 30" cabinet as an example) as long as the bowls are no wider than the 28 1/2". In this case, you'd set the sink down into the cabinet from the top, resting the flanges on the side of the sink cabinet -- then the counter would be installed on top.
What type of sink are you considering -- stainless, cast iron, swanstone, other?
Susan
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