Interesting. This is how ceilings are done here, but I haven't seen a private home with walls like that. Offices, yes.

This might be one of the reasons why Czech construction costs are so high. Expensive material everywhere.

It looks like 'placo' is what USians call drywall or sheetrock. (pressed gypsum with a paper backing). We'd call those rails studs; low density residential construction is usually wood studs, but I've got a project going with metal studs because with current pricing trends it makes more sense; metal studs also require armoring electrical though, and there's some other issues depending on use case.