How do I build best for this?

[tobsod]

Hello!
These holes are located above the interior doors, but now that we're replacing the doors, they are no longer needed. What's the easiest way to cover them up?

 

[jonaserik]

If you can get your fingers/hand behind the wall in the hole, insert a piece of board as long and wide as possible. It is screwed/fastened from the outside, so that it ends up at the center of the hole, it can also be two boards, one on each side of the hole. Then a plasterboard is cut round and screwed into the boards. And putty.

 

[tobsod]

If you can get your fingers/hand behind the wall in the hole, insert a piece of wood as long and wide as possible. It's screwed/attached from the outside, so it ends up centered in the hole. There can also be two pieces of wood, one on each side of the hole. Then cut a circle of drywall and screw it into the boards.
And spackle

Thanks! I'll try that.