Typically a custom vanity costs about twice as much as a prefab vanity because there are more subcontractors involved in making and putting the vanity together. Plus, you need to purchase materials separately from various vendors (vanity base, counter top, sink, & hardware).

With the most common design being a top-mount or under-mount sink, that means most vanities will be measured to the surface of the countertop. Standard bathroom vanity height starts at 32” and goes up to 36”, with 34” typically leaning towards the new universal average.