Trim Behind Vanity . And in order for them to be even, i needed the same amount of width on both sides. Or i could cut into the trim to seat the legs further back, and hope that the eye isn't drawn down there much (it's not in a major sightline for the bathroom). A Relaxing Retreat Case from casedesign.com In a larger bathroom, the high cost of tile could be a big factor when you’re deciding whether or not to tile under a vanity. If you are unfamiliar with the one room challenge, the gist is that design influencers transform a room in their home in five short weeks. 1 remove all baseboard and trim use a sharp utility knife to cut through the paint along the edges of the trim.