Thanks for all the tips! Adding some details - It's the only full bath in a 3b1.5b house, located on the second floor. Right now it's just my husband and I living under the roof and we don't always get ready at the same time. There's a linen closet right next to the bathroom. Since we are doing a gut remodel, we can potentially bring the wall that's next to the vanity down to be in line with the master bed, to fit in a 72" double sink vanity.

So my bathroom has an alcove that measures 63”. I currently have a vanity I’m looking at that will measure 60” for the cabinet and 61” with the countertop. That means I’ll have about a 1” gap on each side of the wall.

How would you fill in that gap on both sides? I understand about putting a filler piece of wood on the side but what about the counter space area? All of the sidesplashs that match I’m seeing around about 0.75” thick meaning that there will be a .25” gap still leftover technically.