tips please for blocking up a doorway

[schmokin1]

Hi all

I have a 1920s house with internal walls of ashcrete block type construction, and I am moving a doorway. The blocks are thinner (3 inches thick) than modern blocks so it would be a PITA to block up the hole with the same material as the rest of the wall.

Therefore I'm planning to put in a stud frame, plasterboard, and skim over. Questions:

Can I leave in the original door frame as it is beefy?

One edge is painted with gloss paint and it will be a ballache to get it off. Can I prime it with something to make plaster stick to it?

Any other tips?

Cheers all

Schmo

[flyingjase]

I'm assuming you are talking about an internal doorway?

We recently blocked up an external doorway, well I say we, the builder did the work and he used those grey blocks and rendered the outside. He plasterboarded it inside.