I'm evaluating a repair task at an older neighbor's house. His dining room has a wall with a single window in the middle of it., and the window was blocked-off about 20 years ago when he had a garage added on the other side of the wall. The window was blocked-off by simply covering the opening with a piece of wooden panelling and then painting the whole wall and window frame the same color. The old couple seemed to think it was fine and have lived with it for two decades. Now, it is time to fix this thing right. It looks pretty ugly, and makes it hard to hang artwork.
My strongest inclination is to remove the window frame and completely replace the wallboard on this (13 x 8 foot) wall. That would leave no interior evidence that there was ever a window in that location, however I am wondering how easy it is to get the new wall to blend seamlessly with the two existing intersecting walls and ceiling. If I sand the edges of those existing walls and do the normal inside-corner treatment (tape and mud), can it look good? My experience is limited to new wallboard joining with new wallboard. Any gotchas?
My option is to treat the window opening like a very large damage hole. Put some wooden bracing in to support the patch, cut a 3 x 5 piece of wall board and place it into the opening and mesh and mud the edges before prepping and painting the whole wall. The wooden bracing would have to be very sturdy so that the patched section of wall would be as strong as the rest of the wall. I'm thinking that this might be a bad idea.
Any opinions?
Ed