You can also consider a semi-recessed sink that protrudes a bit from the counter. Mine is made to be accessed by a wheelchair, so comes out further than a lot of them do. You can find lots of semi-recessed sinks from European manufacturers like Duravit and Nameeks. Mine is from Sbordoni and my counter is 16” deep. But you don’t even need to do that. There are hundreds of 18” deep vanities out there these days. Many are “console“ style like this one: But there are plenty of floating vanities and regular vanities available that are only 18” deep. SignatureHardware.com has a bunch. Or go to the for sale part of Houzz, or to QualityBath.com, Build.com, or any bathroom site and adjust the search parameters to 18” deep and the width you want to see what is available. You absolutely do not need a wall-mounted faucet. As for how much space you need for clearance around the sink and faucet, it all depends on who is doing the countertop. If you are having a local stone company do the top, ask their rules. I tried to work with a couple of the companies near me befor buying my sink and just gave up. Sales people often have set numbers for where it “should“ go and cannot answer questions for non-standard sizes. I tried writing very specific questions to the actual stone cutters to help me figure out which sink to buy and got nowhere. No one would answer at the place that had my quartz. That is how I ended up with a walnut counter. My carpenter is a genius and I knew he could cut those angles for me. You may find it easiest to buy a vanity with the top included. I did not have that option because I needed to wheel a chair underneath my vanity.

My parents house is like that, but there’s a wall with a wide doorway into the area with the vanity, so it’s open but also easy to close off by just putting a curtain rail up. It’s also oriented to the room such that if you only use enough light at the vanity to wash your hands for a midnight potty run, it really isn’t enough to bother someone in the bed if you place the bed sensibly. Getting ready in the morning would be trickier if you needed to do makeup and so on so needed proper lighting, so that’s where a screen or a curtain would come in.

I got the cabinets through Home Depot (20% off) they are not higher end but they have held up extremely well and we’ve been happy with them. I don’t remember the brand, but the color is cognac on maple. They’re standard kitchen cabinets. We got 2 regular drawer banks, 1 extra wide drawer bank, 2 sink cabinets and the closet you can see in the picture for about 1800 w/the discount. We bumped the shower wall 6 inches into the bedroom to make the shower bigger, pulled the cabinets out from the wall a couple of inches to provide more counter top. And curved the edge the counter for interest. Just for fun, this is what we had to start with. The tub was rusted and there were two doors, 1 from the hall & 1 from the master bedroom, we closed up the hall door. I think we got our moneys worth. LOL As for the labor, I found my Contractor through a plumber I had hired to put in a kitchen faucet. I asked if he had someone good he could refer and he referred Matt to me. Matt had his own company but just him and his guys. All of his work was by word of mouth, he didn’t advertise or push for business, he didn’t need to. I think I got fair pricing from him because he didn’t have the overhead a lot of the larger companies might have. He wasn’t the least expensive and he wasn’t the most expensive. Finding someone who was willing to work on our schedule and not having to have it done ASAP is what really helped me to be able to keep our costs at a minium for both labor and materials.

If you post the current layouts with detailed measurements and any must-haves, nice-to-haves, etc, you can get a lot of great advice here from professionals and other folks with talent in design. You may have difficulty finding someone who will do a plan for you who is not also involved in doing the work. Or you may be able to find a designer who'll do a plan for a set fee. Just remember when you start remodeling anything, there are always 1000 decisions and problems that pop up along the way. Are you prepared to deal with that as a DIYer?