Replacement of room doors

I just googled experiences with Meister Portas [...] Apparently, you can expect around €150 or more per door leaf and per renovation

As I said, they probably have several competitors by now; and nowadays, many things are laminated. I can well imagine that one of the local carpenters now also offers new laminations.

We will inquire about this, but if you can get a new door leaf itself for around 100-150 euros, the effort of refinishing it is hardly worth it even for 75 euros, right? Maybe I am calculating this wrong; for a very high-quality door that originally cost 500 euros or significantly more, such an effort is certainly worthwhile. But the doors currently installed are at best mid-range..

I agree with [USER=32530]@Nordlys’s suggestion. Whether with or without a random orbital sander: somehow painting and varnishing yourself is part of economical renovation and modernization. Whether it’s wood or a plastered wall. In the case of doors, it’s a good exercise. If you sand by hand, use a primer, take the door off its hinges to work on it, and paint in one direction with a roller, by the second door you’ll have a bit more practice so that the rest can even be fun, and eventually in the ground floor kitchen, windows, and so on will get a new coat of paint every two years. I would prime the edges with a brush first of all... but you can also learn things like that on YouTube. Cost for one door: €5! Go ahead, you’re now in renovation mode, you can spend what you saved on your parquet flooring. Regards, Yvonne

....where I initially only thought about saving the frames and painting them. The door leaves themselves are not that expensive. Frames do cost a lot, mainly because of labor costs. And changing frames also makes a huge mess. - One thing is also true: Painting a door leaf is not rocket science if time is not an issue. The work steps are all not too difficult. Just be careful. By the way, the dust problem when sanding, if you have to do it indoors, is greatly reduced by using 300-grit wet sandpaper.

And you really think you can get a medium brown, orange-tinted frame perfectly white?

Yes. It was once dark brown.