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I've got this bit next to my back door that looks like it was never properly finished. There doesn't seem to be any structural issue, so I'd feel comfortable fixing it myself.

Trouble is, I have no idea what to do there. Plaster a corner? Put some drywall in? It's a strange shape and I am not sure where to start.

An unfinished corner.

A closer view.

EDIT: As requested, a picture of the top corner and the left side. (This is really a lovely house, overall, I swear! Despite the insanity of a few things like this)

Top right corner

Left side

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Am I correct in seeing the unfinished wall on 2 surfaces? One about 2 or 3 inches wide beside the door and the other wall has about an inch or 2 needing finish? Is that an existing piece of trim that is called cove molding above the area in question? If that was run all the way to the floor would that correct it? In my opinion, it looks like a little mud work is needed, including the area where the existing trim is. Last question, is the partial trim at the top, the same on the other side? – Jack Mar 9 '14 at 18:01
is that exposed concrete or foam next to the door jam? – shirlock homes Mar 9 '14 at 19:09
also, what type of molding is around the top and striker side of the door? – shirlock homes Mar 9 '14 at 19:11
could you add a pic of the upper corner where the top of the door meets the wall? – shirlock homes Mar 9 '14 at 19:28
You'll probably want to match the trim on the left side of the door if there is any. If there is trim there, but you're still unsure what to do on the right side, you should post a picture of the left side so we can see what you already have. – getterdun Mar 10 '14 at 0:35
up vote 5 down vote accepted

This will be a variation of what may have been mentioned already, but this is how I would handle it.

For the tall vertical piece, assemble 2 pieces of 1X material to make an outside corner that will mimic the left side wall where it meets the door. At the top add an additional piece of 1X to fill the void at the wood joist or beam at the top of the door. The idea is to bring the new material out in the same plane so when it is all painted out, it all looks like the same wall around the door. The only difference being new surfaces next to the older surfaces. The illustration will help depict what I mean, take note of the stunning green parts of the drawing that is referred todoor1 enter image description here

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The green is for highlighting purposes, the intent is it will be painted the same color as the wall when done. The beam can be rewrapped to conceal wires too... – Jack Mar 11 '14 at 3:07
I agree with this answer: trim it out. There is no way to use plaster or drywall to make it look natural. Trim is supposed to be a transition, which is exactly what you need in this small area. Besides, thin strips of drywall with corner beads are really hard to get right. I did this next to my main shower due to some old, constricted framing. Took me a week to mud it even, and it still was not close to perfect. My wife hates it. – Snowman Mar 11 '14 at 3:21
Nice mockups! You had a +1 as soon as I saw those. :) – buildsucceeded Mar 11 '14 at 10:14

That looks like you'll need at least two pieces of trim (possibly as many as 4) or one really thick one with the corner chewed out of it to accommodate the bricks/stone sticking out of the corner. The really thick one might actually end up looking the best. Basically build a box that goes from the doorframe to the wall and leaves space for the jutting masonry. You'll probably want to remove the upper white section of board that's remaining from whatever was there before.

Plaster would have the advantage of going over that mess without you needing to adjust the shape of a board to fit it ;-)

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