It would be good to give us a bit more info. I would make the shower wider than 37" for sure you have lots of space in there

Also ..in general…a closet connected to a bath is not ideal…as it is not accessible while bathroom is in use and moisture in a closet with no air circulation…can develop mold and other unpleasant odors

Yes. That shelving situation is where the ceiling has a weird box….see dotted line.

Unfortunately…there isn’t much we can do about the closet location. Hopefully a good fan will take care of mold/odors

Looks like you have room to increase the shower depth in the proposed location.

How big is the closet?

Start by researching the standard sizes for shower bases. It's always less expensive to purchase one and have it installed than having one built on site from scratch.

do you want a seat in the shower.

Is it possible to put a door to the closet from the bedroom instead of from the bathroom? That might give you more hanging space (depending on layout) and it would ensure access to the closet when the bathroom is in use, as well as preventing possible moisture issues.

Thanks guys! No seat in the shower. Starting to consider an acrylic or cast iron pan with tiled walls(not as pretty but seems more practical). The closet is 7x 5 1/2 ft.

Can you show the bedroom . Can the door to the bathroom be moved? If the dotted line represents a drooped ceiling, can it be removed?

Are you wanting windows?

I would prefer a longer vanity than a bigger shower.

This is a nice-sized bathroom -- plenty big for comfort, but not ostentatious.

I would make the shower wider than 37" for sure you have lots of space in there.

Yes, 37" is big enough, but if the choice is wasted space in the middle or enlarging the shower, I'd say enlarge the shower.
Is that shelving situation hiding something you can’t move? It’s too narrow and deep for good storage; longer vanity would be better.

Agree. I'm all about good storage, but that turning-the-corner thing doesn't seem to work, as it creates a difficult-to-reach corner ... I'd rather see a tall linen closet at the end. I once had a 16" wide tall linen closet, and that thing could hold SO MUCH.

As for a longer vanity, I like the idea ... a 5' vanity, while technically able to hold duplicate sinks, is better suited to a single sink /a bank of drawers on each side. Consider, though, that the toilet is directly across from this vanity ... keep this in mind as you place mirror/s. No one wants to sit on the toilet looking at himself in the mirror. (That's pretty important.)

Also ..in general…a closet connected to a bath is not ideal

I think this is more of a fear on this board than a real life problem.
Start by researching the standard sizes for shower bases.

Agree. Shower bases cost less, last longer and are guaranteed to have a good slope towards the drain. Their one negative is that you must choose from a limited number of standard sizes.

With a shower that large, I'd like to see a long ledge rather than storage niches, but do consider your in-shower storage needs.

Be sure, too, in this fairly large shower, that you place the hand-held shower head in such a way that it can be used to spray the whole shower for ease of cleaning.

I would prefer a longer vanity than a bigger shower.

I don't think this Houzzer has to choose.

Some basic questions:

- Where will a person exiting the shower reach for his towel?

- Where is the trash can? Will you need a second trash can by the toilet? My old house required two trash cans per bathroom, and it irritated me every trash day.

- Where is your hamper?

- Have you considered some storage AT the toilet? Right now you'll need to store toilet paper, and -- as you age -- you may have medical needs that would be made easier by such storage (both of my grandparents did). Maybe a set of shallow shelves /shallow cabinet between the toilet and the shower -- or a narrow pull-out pantry shelf. Or you could add a small/shallow piece of furniture on the back wall /across from the closet door. You have the space -- 36" is considered a comfortable width for a toilet, and you have a little more.

- Have you considered adding shower grab bars now? You may not need them, but it'll cost very little, and then you won't need to worry about ruining your waterproofing later when you do need them. They make grab bars that don't look industrial, and it could save you big later.