It all depends on the cabinet. The 30" is the exterior dimensions of the cabinet - you have to deduct the width of the sides of the cabinet in order to get the interior dimensions of the cabinet. Depending on how the sink is attached, you still could need more than just enough room for the sink to fit. From your photo, it looks like you would be cutting it a bit close and I would be concerned that cutting so close would compromise the integrity of the cabinets. I would feel safer going with a smaller sink so that there is less of a chance for my cabinet to get damaged. Others have done this, perhaps they will chime in with what they did. I had to send to the installers the dimensions and pdf's of my sinks before they came out to template my countertops. Did they ask you to do this?

when we redid our bathroom and put both of our sinks together in the same vanity, i thought i wanted 2 separate mirrors... each sink is about 7 1/2 " away from 12" deep towers on each end of the vanity. after alot of thought, i decided it would be too limiting to have to have a relatively narrow mirror above the master bathroom sinks- we put in a large mirror and framed it with mirror molding from our cabinet co. i was planning to put a sconce in the center of the mirror, between the 2 sinks--eventually, i decided to not even do that- but that was my original plan with the big mirror because one of the main reasons i wanted 2 mirrors was so i could put a sconce between the mirrors. i'm VERY happy we went with 1 mirror!!!-(it's about 60x45- had the shower door co cut and bevel it)

Dave... I will do so when I get home...I'm on vacation this week. What I do know is that I have 1/2" walls in my cabinets and the sink does almost completely fill the opening, but there was no scooping. I have some pictures I can post, but I'm not sure if they will tell you much. Here you can see in the upper left where the "block" was installed for the sink rim to sit on. In this one, in the lower right you can see the small bowl is not quite against the wall of the cabinet. BTW...when I say "exterior" or "overall" width, that includes the exterior rim of the sink as well. So, the 35-1/8" includes the 1" rim all around the sink. The starting point for the 35-1/8" measurement should have actually been 1" over to the left and the ending point of the 10-1/2" measurement should have been 1" over to the right. The overall measurement, rim-to-rim, is 35-1/8". My sink is: 1" rim + 21-3/8" bowl + 1.25" separator + 10.5" bowl + 1" rim = 35-1/8" If I had had a single bowl sink, I could have fit up to a sink with interior dimensions of 33" w/1" exterior rim (so 35" overall/exterior width) w/o scooping

Sorry, my sink bowl is 20" not 22". I measured it right, just typed it wrong. Looking this morning at it again, I guess 17.5" isn't that bad. Last night when I was looking at it for some reason the difference seemed huge. But after a good night's sleep it doesn't seem like much of a difference. :) My current sink is split and the large side is deep (20") and the smaller side is narrow with the faucet behind it. In my mind I was imagining that sink as though the entire thing was the size of the narrow side which I believe was around 16".