Is this only for getting the house ready to sell, or will you be living there for a while?

Very difficult to answer as we don't have a sketch of the area you propose and not enough info.

If you remove this bedroom, it could cost you money, not only in re-creating it as a WIC but also the loss of a bedroom eg 2 vs 3 or 3 vs 4 bedrooms. Given the very limited info you posted, I would say not to change out a bedroom for a closet. But we really don't know enough to say. Speak to a local Realtor and they will tell you the added value or reduced value.

Wait, you say none of the rooms have closets? I doubt they can be called bedrooms without closets in them. If none of the walls in question are supporting walls, could you create three smaller bedrooms, each with a reach-in closet?

Some areas require closets for a space to qualify as a bedroom.

A sketch would help develop understanding and ideas.

But it sounds as if resale is imminent.
So if at all you can, do nothing.
Clothes can be stored in wardrobes within a room too; a walk in closet isnot the only option. And a third beddroom is often an advantage.

Sorry for not responding to these comments, been away. As far as sketches, it's just a 9x9 square with a door against one wall. Based on these responses I think my best bet is to add regular reach-in closets to the 2 larger rooms and a set of shelves with a rod underneath to the small one. Something a buyer can easily remove if desired. I don't want to sacrifice a potential 3rd bedroom for a walk-in. Thank you all.

You do not mention windows in the 9x9 room in many parts of the country a bedroom must have an exit other than a door. If it does not it would be better to list it as something other than a bedroom. Library, den, or office.

It has a regular sized window on the wall opposite the door. Hey those IKEA Pax units are pretty nice. Thx.

Not only nice, but very reasonably priced too :) Better than a built-in closet in many respects. Especially in a situation like your situation.

@ Dan

Are you currently selling your house, looking to sell it in the near future, or just concerned about resale?

Some general comments. I would be hesitant to give up a small bedroom in a house that I was planning on marketing in the near future, however, if I was going to live in a house I would take reasonable efforts to make the house livable for me. If you want a large walk-in closet in a house you plan on staying in for 7-10 years then go for the closet, and just plan it in such a way that conversion back to a bedroom is possible. Often you are only talking about moving a door.

There are local conditions that might modify that, areas that might be more attractive to young professionals who would value a nice closet more than a third bedroom, etc., so some local advice would probably be beneficial.

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Contrary to popular belief there is no closet requirement almost anywhere in the U.S. It is possible that some community has put an ordinance in that requires bedrooms to have closets, but there will be an exception procedure for that. I have never heard of that, it is largely just a misconception that gets bandied about a lot.

However, there is power in that misconception. You can't be there to correct every realtor who walks into your home about the bedrooms, and so you should find something that makes it obvious how clothes are stored even if that doesn't convey.

I just sold a house with no bedroom closets and no wardrobes. The home was built in the late 1800's and was photographed with acceptable wardrobes in the rooms. So there was obvious evidence of what was possible with wardrobes, however, those wardrobes didn't convey with the home and it sold without a problem.

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Be aware, I believe there is a requirement of at least seven feet of clear floor space between any two points on opposing walls. So if you do install a closet, or even a permanently mounted wardrobe system, be sure you keep it small enough to allow seven feet. PAX frames are 23" without the door and so if your 9' is actually 8'10" you might screw up even by putting in a PAX system in that small bedroom.

Good luck