Help with door jamb heights

My son has been renovating his home. All the Gyprock walls were replaced and all the jambs installed.Luckily no architraves are installed.

Now the tiler has come along and decided (withour too much consultation) that he needs to level out the floor with sand/cement (this being over a timber floor) and in some cases the sand/cement is 30+mm thick. This means that the doors have to be cut down in some cases to 2000mm, which they can't be!

For the normal swinging doors I was thinking about cutting through the new gyprock and removing the header timber and replacing the door jambs to the "higher" dimension but not the header stud. I don't want to have to pay to get the gyprock reset so the minimum amount of disruption here is needed. Will just having a small header fitted or just nailing the top jamb straight to the vertical studs above the door work?

Now for the cavity sliding doors, I guess there is no option now but to remove both sides of gyprock from the cavity unit and re-fitting the cavity unit to a higher level. Right? Or is there another way please.

Viiking.:(


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