Is skim coating cheaper than drywall?

If concrete is almost flat, yes. With large level differences, drywall is often faster and more predictable.

Can I stay in the apartment during work?

Yes, but cutting and sanding create dust. Empty the room and cover furniture well.

Usually 1–2 days for framing and boards, plus taping, drying and painting time.

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Flat suspended drywall ceiling in Israel | KABLAY