My prep sink is in an 18" cabinet and has a garbage disposer. I squeezed in a door mounted compost bin with a swing-away lid in front, a water filter to the side, and a HUGE bottle of dish soap for the neverMT in the back. It's a pretty dense arrangement.

My cabinet is only 12" wide but it houses a prep sink that has a 7.5" wide x 16"long bowl with a Moen Woodmere pullout spray prep faucet, so we have hoses. Because the cabinet is less than 12" wide, we installed a non- permanent rack storage unit for vertical storage of our cookie sheets, cutting boards and serving tray underneath. There's still enough room to add a half shelf above all that along each side for shallow pans or such to lay flat, but we haven't made those yet.

I have plenty of space underneath mine for various supplies i.e. dish soap, sponges, hand soap, disposal pusher, etc. I have a separate trash bin in the next cabinet. There would only be room for a very small garbage bin under my prep sink.

Mine is in a 24" cabinet. I will have trash and recycling in a 17"deep pullout, and hopefully enough room for a neverMT as well. All the cabinetry is in, but the prep sink has not yet been installed - I think everything should fit though.

What's a neverMT???

As I'm looking around on GW, I'm noticing lots of people saying they would want trash and disposal and soap with their prep sink. That's A LOT in a sink base. We are big composters and I literally almost never use our current garbage disposal. It get's used, just not a lot (like maybe once a week?) so I'm wondering if skipping the GD and doing a trash or compost (or both?) plus soap makes the most sense for us, and doing GD at the main clean up sink instead? I've read a lot of people regretting not having a GD at their prep sink though...

NeverMT is when you attach your soap dispenser plastic hose connected to a huge jar of soap under your sink, instead of having to take apart your soap dispenser and fill up that dumb tiny bottle every time it goes empty. You can go months or years without swapping out that bottle :) You can buy a kit or just get the parts from Lowe's or HD. Example: http://im-3.eefa.co/ci-dispnmt-soapdispenser-size-s3.jpg

Sorry, no input on the GD or compost since we do neither.

I compost everything I can (won't do dairy or meats), but still use the GD about every other day so I don't have to worry about the nasty bits in the sink. When I was a kid and it was my turn to do dishes I dreaded picking the gunk out of the strainer at the end. So now that I'm an adult I just say 'no' to strainer baskets!

My prep sink cabinet is 22" wide. I do have a garbage disposal & still have room for a medium sized trash can & a second set of frequently used cleaning supplies for use on that side of the kitchen. Having a second set saves steps. I have other stuff (vases, etc) stored in the back of the cabinet.

We have a septic system so I don't put a lot of stuff down either disposal but I like being able to grind the small bits. During the reno, I was using a sink in our basement & not having a disposal bothered me, which led to the decision to put one at the prep sink.

Edit: fouramblues described perfectly why the basement sink without the disposal bothered me.

LOL, I used to gag as a kid whenever I had to empty the sink strainer! Thankfully, I've been able to conquer that one, but I can completely relate to those who get grossed out by it.

In the cabinet under our last prep sink, I kept liquid measuring cups and salad spinner since I always used these along with water. There were other things under there too, but I've forgotten what...

Mine is in a 24" cabinet. It has a tip out drawer for sponges and drain stopper. Under the sink is the garbage disposal and the large deep sink itself. On the floor of the cabinet, I store all the general kitchen cleaning supplies (granite cleaner, stainless steel cleaner, wood cleaner, etc, essentially all cleaning supplies except dish soap/dish washer supplies that are under the main sink), and a basket to collect dirty kitchen towels and rags.

Mine will be in an 18" cabinet and have a compact gd, a tip out tray and a small pullout trash.

You can have a lot of function if you plan for it -- just like the rest of the kitchen. I have a 27 inch wide, 21 inch deep cabinet with a 16 inch sink with disposal and soap dispenser with Never MT and a tilt out that I don't know that I would do again. I used a corner drain sink and told the plumber to keep the plumbing to that side and not run it all over the cabinet. I have a large pet food bin and room for canned food and treats as well as some cleaning supplies. Would work for a trash pullout too, but I put one beside the sink. At the cleanup sink, I put the trash and recycling underneath so I could have 2 DWs. Great trade off for us.

I have a pullout sprayer on my prep sink. I highly recommend that. I wouldn't have a sink without a way to spray it clean. I also have a garbage disposal and am very glad we do, but we do not compost. I use it very often. Several times a day. I also have a built in soap dispenser and the air switch for disposer. I don't have much room underneath. I wanted a built in trash system, but didn't get one (long story). So, I have a small trash can underneath (we have a trash pullout in another spot). Not near the kitchen now, but I bet my cabinet is about 18 inches wide.

I'm with FourAMBlues. Even if you want to compost pretty much everything, you're still going to have bitty-bits that're going to be stuck to plates and pots ... and if you have a garbage disposal, you can just wash them on down ... otherwise, you're going to have to clean them out of the sink.

We compost as much as possible but I am so glad we have a disposal in the prep sink for the same reason others have stated. Under our prep sink is mostly garbage bags, cleaners/soaps, and some colanders. It's not as organized as it could be but it works for me. :)