single. otherwise you'll have two tiny sinks and no counterspace.

why two sinks in a small vanity? it must be a small bath? unless you have 5 kids sharing this room at one time, one sink is fine.

If you've got adequate storage like recessed medicine cabinets, built in side storage shelves and a vanity drawer space, perhaps a single long trough sink? They probably look best in a modern/minimalist style bath and only if you don't need much space for items on the counter itself.

Unless you're sharing the bathroom with someone else and it will come to blows if you don't have your own sink basin, please do just 1 sink in that size vanity.

I have 2 sinks in a 60 inch vanity, and even that feels tight to me. I've spent the last ~6 years wishing I only put in 1 sink and used the extra space for more drawers.

Appreciate the feedback, I currently live alone, but I am always thinking of resale or meeting someone someday! The bathroom will have a water room with a freestanding tub and shower. I am adding a room on top of the living room.

I'll say single sink 100% of the time. It's just practical, as it allows for drawer storage space; that's more important than a duplicate sink. Go with one nice sink on one side /a decent-sized drawer on the other side.

In this case, a 4' vanity cannot support two sinks. Not unless you're talking about those mini-Ikea sinks.

As for resale, even people who really want duplicate sinks don't want poorly-designed duplicate sinks.

The second vanity that Beth posted is a good example -- each person can have a stack of drawers, even if they have to share a basin. Ikea does do vanities with two sinks, but I've only ever used them in kids' baths.

Single sink with plenty of counter space for hair tools and makeup. I don’t know your gender, but these days, it doesn’t matter. Plus, if down the road you sell, someone who does their hair and makeup in the bathroom will appreciate it.