I'm wanting to stud wall this opening, I don't think it will fall down as I can't imagine the wood is providing any strength? It goes same direction as floor joists upstairs and has a wall above it.
The wood architrave should only be decorative - looks a similar setup to our house. I closed ours in as it had a through lounge. My joists go from side to side too so can’t imagine it will have any loading. I also have a wall above mine although when it was a through lounge there was some kind of lintel up there with a bit of wall each side - exactly what’s there to the right of the door now with the same on the other side.
Glazed doors ,side panels and architraves aren't going to be structural so if removing them and replacing them with a stud wall weakens the structure I will eat my hat .
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