Boarding up an internal door

I want to board up an internal door, so that it effectively disappears and just looks like the rest of the wall. I'm quite ok about removing the door, frame, architrave etc - that seems fairly straightforward.

Then I intend to fit a stud wall, faced with plasterboard. I'm going to insulate the stud space and face it with wall board. Presumably at this point it will need plastering to tie it into the existing walls (or is there another way??)

My question is, given that it will need it, how much allowance should I make for the plaster skim coat, ie how much should the plasterboard be recessed compared to the finished wall

Thanks in advance

jack of all

Allow about 3 mil or 1/8" for skim coat. It would be good practice to chip off an maybe an inch or so back of existing skim coat to the ope surround, prime with PVA bonding/ sealer and use a self-adhesive scrim tape to cover the joint of the old and new construction to control cracking. Even with the above preparation you are likely to get a slight shrinkage crack as the plaster dries out.

mfceiling

A bit of bonding compound over the scrim before skimming usually stops or at least limits the cracking.