size?

Does it have another niche inside, like a little crawl space?

Difficult to say with the info given. Measurements and a picture of the space (ie vanity) would be helpful :)

What is your planned usage for it. I know storage, but what kind of storage? I think I would consider having deep drawers built and have them all be pullouts. Not sure this would fit with what you plan to store there or if you have enough space across to be able to pull them out.

If you could do drawers I would also have 2 large ones that could be divided into laundry sorting. This way you can get undressed and get in the shower and put away your dirty clothes easy and with it already sorted to go into the washer later.

I'd put in oversized deep drawers

I was also thinking drawers -- treat it like a bank of cabinetry, flush to the face, with drawers and shelves for anything you might want to store.

A little confused by what looks like a little framed door at the back of the niche -- is that a thing?

Is that the hatch to the attic or crawl space that is accessed through there? You have to define the problem better, with measurements and additional photos.

Do you have a place to store luggage? A couple of shelves and doors would be an economical solution for that. Otherwise drawers would be useful for out of season clothes.

I'm not home to measure the spot until tonight but here is the floorpan for the space.

Could be a good spot for a safe.

so its about 7 foot wide and 4 ft deep? those would be some massive drawers lol. APX how tall its it? close you your own height or, if you had to guess?

I wouldn't want bi fold doors because as shown the actual door opens into them, I would want something that moves left or right..

Do you have an unwanted child from a deceased sibling that dabbles in magic??

Visually split in half vertically and imagine two sides. Maybe you do either one really big drawer on each side (so two side by side), or four in a horizontal row so that each drawer is deep but maybe not as wide. Consider what you might put in there. Towels? Extra sheet sets? I LOVE the idea of making part of it a safe - great idea. Then on top you could do open shelving and put baskets to store extra toiletries, TP, etc. Stuff you want easy/quick access to but don't necessarily wish to display.

Also, consider if you do any drawers or doors - you'll have to be in the bathroom with the door closed to access whatever is in those drawers or behind doors. If they are open shelves - easier access without having to fully close the bathroom door. Consider that in terms of what you'll put there. Extra sheet sets - you probably only need to access 1x a week, so no big deal to close the bathroom door and open the drawer/door to access sheets. But it would be annoying if you kept your blow dryer there, you know?

Guys she didnt ask how to use it she asked what kind of doors to put on it.............

Are you finishing the floor in there or are you not. If not put in cabinets with deep drawers and not use doors. If you are finishing the floor then just put short cut down doors that open like your drawing. If you want to use cabinet doors you need a frame for them to attach to and they would be too big to just have two like the drawing so you'd need to use multiple cabinet doors.

Without input as to how you want to use it no-one can say what doors would be best.

Doors? These are Push latch, no handles....colored mdf ? birch plywood, stained ?

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I have a similar odd storage space in my home, but not under a stair. I got rid of the awkward short bifold doors and installed a linen curtain.

Too. Maybe plastic bins [no moisture gathering inside] ? If art's style above it blended with the curtain yeh...

Curtain

I think depending on the width, I'd put doors on them with pretty handles and store luggage, etc. in them.

Here’s a though, I hope I can explain it. There’s drywall above the opening, right? What is behind the drywall? Is it possible to push that drywall back 6“ or 8”? Enough to put regular doors, full-size doors, there, then you could have shallow storage up top for toilet paper, shampoo, etc, and open room below for laundry baskets, a small safe (behind the laundry baskets), or other storage.

^^^ that's very interesting thought, I know there are stairs on the other side of that wall I still think the door swing of the actual entrance door might get in the way of any style door. Meaning you have to close the bathroom door to fully open the closet door.... what about a barn door?

I have two bathrooms in my house, laid out exactly the same. On one side is the vanity and toilet; on the other side is a linen closet and tub (so the closet is as deep as the tub). The closet door and bathroom door hinges are in the same corner, so the bathroom door does not need to be completely closed to open the closet door part way.

We've lived with these closets for almost 30 years, and it isn't a huge inconvenience to close one door before opening the other. Our vanity is large, with only one sink, so there is plenty of room to set down a stack of sheets or towels before opening the closet door.

If your are in the bathroom getting something from the linen closet, aren’t you fairly likely to have the bathroom door closed anyway?

The entry door is going to swing against that area, but it will swing against that area whether it has a cabinet door or is open storage. I like the laundry sorter idea. it looks like the original plan was base cabinets with deep drawers. I wouldn't protest that in my bathroom. lol
I would go with drawers over doors.

I had a super deep and awkwardly placed cabinet in my bathroom. When I moved, I was surprised how much stuff had gotten shoved to the back of the cabinet and forgotten.

I like the idea people had of using it to store luggage or Christmas decorations or things that get pulled out once a year. If it is to be a useful for bathroom, I would suggest the drawers since it would allow you to find the things lurking in the back. If you have whimsical little kids, close it off in the bathroom and open it from the side and create a magical little mini-reading room under the stairs (and turn it into storage when they get older).

But at 3ft deep isnt that a bit hard for drawers......asking for a friend lol.

There entire space doesn't have to be used. Don't go beyond the point of diminishing returns.