We just did a bathroom remodel and only have an 18" deep vanity. We did lots of research, but were having a hard time finding a decent sized sink to fit until we came across this one.  In a review we read somewhere, someone said they used it on an 18" vanity, so we decided to try it. Even though it's on the small size, the rectangular shape, straight sides, and depth makes it feel large. The sink is a perfect fit for the vanity. The only negative is we wish the bottom of the bowl was sloped a bit more. Other than that, it's great.