It's really a matter of personal preference - my GC suggested I get the deepest I could but when I looked at 10" deep sinks, I found them way too deep - I think the one I ended up with is 7" or 8" and it's just right for me. If you have 3cm granite it will add 3cm (1 1/4) to the depth of the sink.

It's really a matter of personal preference. Our sink is 10" deep (then add the granite thickness for the total depth--and granite thickness varies--2cm-3cm seems average). We are very happy with our sink depth. There are numerous threads with plenty of opinions as to the sink depths the various posters prefer. Do a search at the bottm of the kitchens forum, and you you should pull up a bunch of those threads.

Hi, I have struggled with this also. I ended up ordering an 8" deep undermount double bowl sink, I will have a 1" high grate in one bowl. The granite is ~3/4" thick and the top of the counter will be 36" high. I am 5'6" of average porportion.

I went around to different stores with my measuring tape and pretended to wash dishes. Other things that effect my comfort are: width of counter between me and the sink (~3"); height of faucet (I have to slouch to get hands under my mom's faucet); and how far the stream of water is from the outer edge of the counter (12-13" feels comfortable for me). I still need to pick the faucet.

I would prefer less countertop between myself and the sink, but granite requires 3".

That's a really good question!

The best answer is to try someone's sink if at all possible. The granite will add whatever depth it is, so a 2cm granite will add 3/4", a 3cm granite will add almost 1 1/4" of depth.

My deep sink is 9", with 3/4" granite, and I have no grid. I am 5'6". I wouldn't want it any deeper. I guess if I had a 1" grid/grate I could go another inch, but you still have to clean the sink without the grid sometimes I assume. The beauty of a deep sink is the dirty dishes it hides- an added bonus I hadn't anticipated!