A double vanity needs width before it needs anything else. Below about 60 inches the two basins crowd each other and you end up with two cramped stations instead of one generous one, so everything here starts at 60 and runs to 96 inches.
What you gain is not just a second bowl. It is two faucets, two mirrors if you want them, and the end of the morning queue in a shared bathroom. It is the single upgrade most couples say they notice every day.
Check the wall first. A double vanity wants its plumbing roughed in twice, and the spacing is set by the cabinet rather than by you. Every product page lists the exact width and the basin centers, and we will send a specification drawing before you commit if you ask.
