The standard height for bathroom vanity units would tend to be between 760mm and 815mm, or 30 and 32 inches.
However, with regards to modern bathroom vanities, a common design trend points towards taller models, around the 915mm or 36-inch range – the typical height of a kitchen countertop.
For a closer look into all sorts of bathroom vanity unit design aspects, take a look at our Buyer’s Guide To Bathroom Vanity Units.