I have the double 60" Fairmont Windwood vanity with two Kohler Archer sinks. I just checked and front to back the vanity is 21" (plus 3/4" for the drawer front). The countertops were just put on yesterday - here's a picture of the one in the other bathroom, which is a 48" single, but it's otherwise the same (all Fairmont Windwood, all Kohler Archer sinks).

I'm putting two sinks into a 56" vanity for my girls' bathroom (4 girls share it). I'm installing Kohler Caxton, but can't decide whether to install the small or medium size. I noticed in the Kitchen-Bath store that on the medium Caxton, the granite over-hang was more than I would have expected for an undermount sink, especially at the upper drain hole edge. In effect is to give you a little more counter space. Plus, you couldn't see where the sink met the granite. That "line" was covered by the overhang. The bath shop gave me a pair of templates for each sized sink, I will figure out which works best. We are replacing these really ugly, whipped avacado looking cultured marble shell shaped sinks, which each measure 19" across. The Caxtons measure about 16.5 and 15 inches from side to side. Any change is a good one and will result in more counter space regardless of which sink size I choose.

We are doing a 56" and doing one sink. Depending on your sink choices you might look for a larger then average sink size. Kohler makes some sq sinks, and others that are larger then the standard oval type sink. I want to put a 30x36 mirror over this vanity and DH says that mirror is too small. (lights going over the top because of elect. mistake. (I was going to put on sides) I think it will be about right. Any thoughts?? P.s. and I can't turn it to the 36x30 because it has a small trim on the bottom.

Mine is 65", and only has a wall on one side, but I'm still very happy that we converted from one sink to two. I shared your concerns, but for us, this arrangement is working out well. First, we have a small bathroom, and storage space is limited, so I purchased oversized medicine cabinets. They are not elegant, but they take the stress off of limited counterspace. Second, we "tweaked" the location of the sinks a little, which made a big difference. Ours is a fairly standard dual vanity, with a bank of drawers in the center, and a cabinet on each end, each holding the sink. Normally with this set-up, the sinks are each centered over the cabinet on each end, so you have only a few inches of counterspace on the ends, but lots in the middle. Rather than having the sinks centered over the outer cabinet (so that the middle of the sink is lined up with where the doors meet), our sinks are actually slightly set *inward*. My contractor had to cut into the "walls" of the center drawer bank a little to pull this off. He thought I was crazy, but it makes a big difference- if we had not done this, I'd constantly be elbowing the wall and feeling crowded. If you have a wall on each side, I think it's even more of an issue. This might be easier to visualize with a photo..... The last thing I did was get fairly small sinks. How much room does it take to wash hands? I found American Standard sinks that are 11x14, but still 5" deep. (I like the depth for the occasional handwashing of a small delicate garment.) The sinks are small enough that the counter feels very roomy. Try going into a showroom where they have stock 60" dual vanities, and stand in front of it imagining a wall on each side. For me, it is workable, but only with the sinks custom fit like we did.....just something to think about!