Whomever built our house sucked at math, because the space allotted for a vanity is 1/2 inch off from the prefab vanities you can find at home improvement stores such as Lowe's and Home Depot. Don and I decided, after looking on Pinterest, that our best option would be to find an old dresser that Don could transform into a vanity. We happened to find this one at Downeast Outfitters and it fit perfectly into our bathroom space, so we purchased it.
I won't go into great detail about each and every step, because there are many websites with instructions that you can Google if interested. You can see in the photo above that Don did modify the drawers for the plumbing and cut a hole for the sink.
...and he used a few coats of Minwax Indoor/Outdoor Helmsman Spar Urethane Clear Gloss (above) on the top of the dresser to protect it from water.
I like the way the MINWAX Gloss made the top of the vanity a little darker. We also painted the hardware Oil Rubbed Bronze to match the rest of our home.
We both are pretty pleased with the finished product.