It looks very much like those are supporting columns. Someone has removed that wall in the past, and the beam and posts are there to support the wall they removed. The wall can always be put back there, if you want to close it in, but, yes, there will be floor problems, unless that floor is original, and is underneath those enormous columns. If the floor went down after the wall was changed to what it is now, then its unlikely their is floor under anything there.

You are certain they are not load bearing?

Call a contractor. if you want to use it as a bedroom, you need to CLOSE the opening to accommodate either a single or double door, and that will need to be a deep enough wall to cover the footprint of low knee walls, and not expose a sub floor

No matter what, you will need a contractor. As to a pocket door/single ? You will need total removal of knee walls.

In other words? You are building a New Wall. In any scenario.

If there is no very near bath? I would not plan a bedroom, I'd leave it alone and make a smashing looking office.

Have you tried taking off the baseboard inside the room to see where the floor ends?

Whether you want a bedroom or an office will determine just how closed off the room will be. A bedroom will require a lot more privacy than an office. You could add wallboard to the open area above the half wall/columns, and then French doors for an office or solid doors for a bedroom.

We actually had a similar situation in our vacation home--the master bathroom was open to the bedroom, with a half wall and column on one side and a cased opening on the other. We closed off the are above the half wall, and added doors on the other side. It didn't require any demolition.

French Doors with a Transom

Fill side walls with drywall.

First issue: It is not a good bedroom unless a bath near the space. Even then......as an adult guest I'd not love the nearness to non private areas of the house.

Second: It seems large enough for a good looking office space, with even a pullout sofa for a FAMILY guest, or grand kids.

Third: Don't destroy the entire entry with a cobble together . You need a contractor and a trim sub.

If you need the space for either of these functions? A thing worth doing, is worth doing well. It has a flip side of the entry with a dining room opposite? You don't want a left side that comes from another part of planet EARTH. Such as incongruous metal doors and a filler. Sorry..no

Show the opposite side, draw and measure this space, clarify the goal as I do see a Peleton : )

Thanks, Bev, for providing a visual for my ideas!

It should be fairly easy to infill those openings between the columns and adjacent walls. If it becomes a bedroom you will want walls that a solid and soundproof. Should also be easy enough to install some wall and a door between the columns as well.

The problem with pocket doors is that you'll have a problem with all that trim. Easier and attractive to hang a door between the columns and fill in the rest of the wall. A barn door won't fit with your style. If you don't need all that space, you could put some heavy curtains on a ceiling track to divide the room.

IMO first you find out the purpose of the columns then tell us a bit about the style of the rest of the house IMO even if those are supporting thye ar monstor size IMO and look silly with the wide tops jutting into the rooms . No matter what those can be much smaller and cleaner looking then a good contractor can build aw all and add nice french doors for access and you can have an office and a nice sofa bed for the odd guest .

I agree that the columns are too large for the space. The house is in New England and has traditional aspects such as the molding and grided windows However, it is also quite contemporary with a double story family room that is open to an adjoining kitchen. My personal style leans towards contrmparay/transistional -I like clean lines, open spaces, and mid century style furniture.