Is this wall finish considered Level 3 or Level 4 Drywall? The place was built in 1980s, and has very unsmooth appearance, compared to newer places. Just curious if skimcoat would help, and if has to be Level 5 finish? A drywall contractor said Level 5 is very expensive to conduct. I am trying to do a job with the proper budget.
That is a textured finish called "orange peel". It is typically applied over a level 3 finish (taped, a build up coat or "blocked", then skimmed and sanded), and is usually sprayed on by one means or another.
If you small repairs needing to be touched up , it is available in aerosol cans.
If you want to cover the texture, and have a smooth wall, then skim coating everything, which pretty much a level 5 finish , is your only option. Well, there are other options, but that will be your cheapest route if you want smooth wall.