If you are doing an undermount sink, it will have to be less than about 28" to fit inside the cabinet. If you are doing a drop-in sink, you can probably do a 30".

If undermount, .. in my opinion...here is the math.. the cabinet walls are probably 1/2".. so subtract 1" total and subtract 1/2" clearance on either side so another inch... and the lips of the sink are usually 1" ..... so.... 30 - 1 - 1 - 2 = an interior bowl measurement of 26" is the largest... 28" will fit, but the sink lips will extend above the cabinet walls... making replacement difficult, which can be risky.

27" is a decent size of single sink.

http://www.us.kohler.com/us/Vault%22-29-1-2-x-21-1-4-x-9-5-16-under-mount-single-bowl-kitchen-sink,-stainless-steel-with-shortened-apron-front-for-30-cabinet/productDetail/product:428669/428669.htm?skuId=412314&brandId=797249&pageName=globalSearch&_requestid=6568840

The Vault Apront Front Stainless sink K-3963-NA would be a great choice. The minimum base cabinet width needed is 30".

I have consulted with a kitchen designer who offered that I could cut into the sides of a plywood 30" cabinet and "scoop" out the sides of adjacent cabinets to fit a 36" sink. The left and right edges of the sink are only an inch or so away from the top drawers of the cabinets to the left and right of the sink. My contractor thought it was possible.

sorry, archan2000, that sounds ridiculous...that would extend 3" into each of the adjacent cabinets. there would be no room for drawer slides and if there was, what would you mount the slides to?. Can you show pictures of this actually working?

i was going to modify my cabinetry to put in a larger (undermount) sink, but someone pointed out that should i need to replace the sink at some point it would be impossible to get out without tearing apart my sink cabinet.

Anyone know the model number for the 27.5" Franke?

I'd love to know that Franke model # too. having problems finding a sink for 30" cabinet.

Don't know the Franke model, but here are two sinks that would fit a 30" base. I'm going with the Blanco in my kitchen remodel.

http://www.homedepot.com/p/Elkay-Innermost-Perfect-Drain-Dual-Mount-Stainless-Steel-27-in-4-Hole-Single-Bowl-Kitchen-Sink-HD523566/203247477

http://www.homedepot.com/p/Blanco-Niagara-Undermount-Stainless-Steel-27-5-in-0-Hole-1-1-2-in-Bowl-Kitchen-Sink-440161/100014110

I'm also searching for the largest sink that will fit in a 30" base. I came across the Kraus KHU100-30 and people are saying that this fits into some 30" sink bases. See the comments on Amazon. There is even a photo of it fitting snugly into IKEA's 30" base cabinet.

http://www.amazon.com/Kraus-KHU100-30-Undermount-Stainless-Kitchen/dp/B0032BYM4Y

i showed that one to my plumber but he said it wouldn't work. i ended up going with this one (i am in canada so not sure if you can get it in the states) and we are super happy with it. definitely large enough.

http://www.prochef.ca/en/products/proinox-h75/ih75-us-27188/index.html

I just removed a 33inch sink from a 30 cabinet. It was fine

Measure the double sink basins from outer edge to outer edge. That is the measurement you need. You can generally put a 30 inch into a 30 cabinet. Top mount is fine just scoop the gables at the factory. An undermount 30 is generally 28 wide so it will also fit.

This is why you purchase/order your appliances, sink and faucets before cabinets.

Putting an actually measured 33 or 36 wide sink into a 30 cabinet is not a good idea. It interferes with the dishwasher or cabinets beside it.

Christopher S that sink has a 10 inch deep bowl. Does it show when you open up your sink base or does the apron hide it?

Robin Bonner your plumber was right -it sits so low therefore the plumbing runs really low which can be a real problem under the sink and some municipalities will not allow the trap that low.

I answered the above question because I was presented with this page by a customer. The Tape measure wins out over anecdotes.

my contractor has made a larger sink work by altering adjacent cabinets without effecting function.

Has anyone tried to put the Blanco Precis double bow granite sink in a 30" cabinet? It's 29.75" wide. Do you all think that would work to mount it undermount? http://www.blanco-germany.com/en_us/en_us/sinks/product_catalog/sink.html?sid=1269500751123&filter=true#pros

I'm looking for a cast iron or fireclay sink that will fit into a 30 inch base cabinet. I want an undermount. I found a kohler farmhouse sink but it goes to the very edge of the front of the cabinet. I think that might look odd. It does't have to be a farmhouse sink

Look at the single bowl 25" Kohler Riverby. I have used it a couple of times and it is a beautiful sink. I really like that the drain is off to one side so that it leaves more usable room under the cabinet.

Wish I would have found this thread before buying my sink. Made the mistake of getting a 30" sink base and buying a kraus khf200-30. I can make it fit with a lot of modifications, or I can sell it and buy something else. That something else I'm trying to figure out. I want a 27-28" rectangular undermount. People say they fit the 30 inchers or the kraus 28 which does drop in. The dilemma I have is even though you bring it all the way to the front of the cabinet, because it's 18.5 inches front to back, does that leave room for a faucet centered? 25 inch countertop. I have looked at a few sinks and an 18.5" bowl leaves 4 inches countertop in the front. If there is a backsplash lets say that's 0.5" that leaves maybe 2 inches for the faucet. Is that enough space? I would much rather have the farmhouse because I could slide it forward, but as mentioned above, It looks funny having stainless steel the entire front of a 30 inch cabinet and it's right next to a stainless steel dishwasher that's next to a stainless steel fridge with minimal cabinet dividers in between. Didn't look funny in the renderings, but looks funny in real life. I might go for that Kohler riverby looks nice too

so, how does your kitchen look, I'm thinking about swapping out my 36 inch sink cabinet for a 30 inch, just curious how it looks, also, how does your plumbing and garbage disposal fit, is there enough room for a pull out trash?

For whoever may look for a double sink fitting a 30" cabinet: II searched long and wide and found this which fir our 30" cabinet and with the low divider also allow for washing larger pans: https://www.amazon.com/Ruvati-28-inch-Low-Divide-Undermount-Stainless/dp/B077NJWW2Y/ref=sr_1_22

I am in search of a 22 x 31" double bowl stainless drop in sink. Currently have a 31" single bowl and want to use the same hole.

as archan2000 points out it is possible to do a larger sink but you must know what you are doing, you have to keep in mind the adjacent cabinets, if they have drawers or not, also make sure you support your sink base so it is structurally sound for your stone or quartz top I did a sink base 27 and retro-fitted a 33" sink _void corner on the left