ᐅ Costs for Plastering Basement Interior Walls – What Expenses Are Involved?

We only realized today that, according to the contract, the interior walls in the basement (Ytong) will not be plastered. Somehow we overlooked this or, as inexperienced homeowners, did not expect them to leave a “bare” Ytong block wall in the basement. Especially since there are still gaps between some of the Ytong blocks. We’re not exactly perfectionists, but we would simply prefer a plastered wall that we can paint if needed.

Question: The basement is currently completely built. Does anyone know if: a) the walls will be handed over as they are now, or if any further treatment will be done (e.g. to fill the gaps), and b) what approximate costs I can realistically expect if I hire a plasterer to do this? The area is about 60 sqm (650 sq ft).

We would like to resolve this before the electrician installs surface-mounted wiring.