Bathrooms are a place where custom cabinetry can make a HUGE impact. With factory built, store bought vanities, you are stuck with the sizes and layouts they offer. Bathrooms can often be tight spaces where every inch counts.
Take, for example, the two pictures above. This is a 7 ft x 6 ft full bathroom. Originally it had a single sink with a small cabinet below. There was plenty of space along the wall, but because the space between the wall and the door opening was only 18" deep, no standard vanities would fit, especially not ones that would maximize the space.
The solution was a 17" deep cabinet that stretched the entire wall, now with two sinks, twelve drawers and two cabinet openings. That's a big difference!
The other down side of many factory built vanities is the use of particle board. Particle board is essentially wood chips and saw dust, glued and compressed into a board with a thin veneer of plastic or wood glued over top of it to give it the appearance of wood. It can be OK in some situations but not anywhere where there is water. Whether it be on the floor after a shower, from the sink or from the inevitable leaky faucet or drain, there is going to be water in a bathroom. There's just no way around it.
Of course no type of wood is completely impervious to water if exposed for extended periods of time. But with the use of high quality, furniture grade plywood, topped with the correct, high quality finish, your bathroom vanities will hold up to a lot of abuse and withstand water better than any other type of sheet-good (particle board or MDF) available on the market.
Feel free to get in touch about getting a quote for a custom bathroom vanity for your next bathroom remodel.