Uncategorized Bathroom Double Sink Vanity Dimensions / Sink base cabinets are another common sink type found in most bathrooms, though your size is ultimately restricted to the average size of the base cabinet installed in your a popular choice for a master bedroom, a double sink vanity by its name, allows you to have two sinks instead of just one. In many cases the cabinetry not only hides any exposed plumbing but also provides space to hold cleaning.