Custom, made to fit, but I don't like them. They are (most often) frame-less, particle board boxes, and to me personally just don't look or feel as nice as some of the semi custom cabinets (like Medallion, Brookhaven, etc.) Our last house we bought Medallion, and purchased with Lowes. The cabinets were beautiful, but the ordeal we went through with Lowes is another story! This time around, we are again choosing Medallian, but working with a local kitchen cabinet maker who is also a Medallian distributor. Price-wise - he said either way they would cost us about the same.

Usually there is an overhang on both sides if the cabinet is freestanding. If the cabinet is against a wall on one or both sides, there will not be an overhang there. I had this situation in an old house where one side didn't have an overhang. For a 24" cab, the top is usually 25", meaning a half of an inch overhang on each side. Hope this helps.

Thank you so much for your advice! Do you have a pale gray or taupe recommendation that you've used in the past that would work well?

Are you replacing the floor tile completely? If not, you may have a problem. The current tile may end at the vanity edge. With the new mirror, be sure to use only water - no glass cleaner - to clean it. I know that with mine, using glass cleaner will void the warranty. Cleaners wicking up behind the glass is said to be the cause of the loss of silvering you see on the edges of mirrors. A spritz of water and a microfiber cloth does the trick. With so many designers insisting that you should not put two sinks in a 60" vanity, there must be more than a few to see. Just for grins, check out Wayfair, where you can do a search for a vanity that size, then specify one sink. See what is out there to buy online if you have not looked already. Once you have seen them, you can look for local distributors of that line if you do not like to purchase such large items online.