Revisions log for Answer #2990

It seems to me that the door shown is rather veneered. Actually, it wouldn't be much of a hassle to replace the door(s). If the trim is not glued in, the frame can even be removed without damage, even without damaging the plaster.

I wouldn't recommend painting it, because it will fail at the rebate and the corners. If you want to paint white, then paint the frames and door leaf.

First remove all fittings as far as possible (including the lock), then carefully remove dirt and grease with a gentle cleaning agent and sand the old paint with sandpaper (180 grit). Then clean again (dust-free) and fill any missing areas. If necessary, sand again and make it dust-free again. Prime and then apply a coat of varnish.

What I would do then is to change the handle set, but it's a matter of taste. You see, there is a lot of work to do.