Hi all,
I recently noticed a big crack in my wall and it has opened up so much that I can see light from the other side. Previously it was a smaller crack but we hired a odd job contractor to plaster over it many years ago. Now, the plaster is coming out and we can see the deep crack underneath.

Room 2



This the view from the other side of the wall - Room 1



There's another hairline crack (horizontal + vertical) on the opposite wall of Room 1.



Is it as serious as I think it is - like need to get expert to check and vacate the room (second story) asap?

This existing house for 30 years...no renovation done recently but the hairline cracks started long ago...😔

Ask contractor check or need to get specialised engineer?