Hello all need some help/advice/pointers I am currently decorating our bedroom, doing all the normal things like moving lights, adding wall sockets and lifting old floor, I went to remove the UPVC sills all the way round and when I removed the top bit it pulled plaster off and exposed what looks like tiles, all the old cement is also loose and falling away.
My question is how can I repair it or can I pull it all down and replace the bricks and cement, without the rest of the wall around or above the window falling in. I have a plasterer coming on Monday so need to sort it ASAP, any help please, I tried to add a picture but it says it's too big