Extension or knee wall height increase?

An extension to the living room is expensive but once the foundation is in place, an additional floor is no drama according to the company, so you can manage with a bit more. Then I would of course also directly expand the bedrooms on the upper floor.

A conservatory would of course be the cheapest solution and also the most logical, but is something like that possible? It’s supposed to be integrated into the living room, so the outer load-bearing wall is partially removed.

I have now made some inquiries; if the extension costs me about €80,000 and the conservatory + knee wall only €30,000, then of course I would go for the cheaper option.

So my parents had "only" offers around 40k just for a conservatory extension without knee wall heightening, but elsewhere in Germany there seem to be different prices.

In our neighborhood, someone is currently building a two-story extension; they have planned 100k with a lot of own labor.

Winter garden + knee wall only €30,000 then I would of course go for the cheaper option.

Please separate the two parts. I quickly googled and a warm winter garden (as part of the living room) costs roughly €1,500-2,000 per square meter. So for you that would be €15,000 - €20,000 without the complications with the load-bearing exterior wall. I doubt that someone would increase the knee wall from 80cm to 200cm (120cm difference) for €10,000. When I look at my own offers, for example, I have the same house once as a half-story upstairs with about 1.50m knee wall and once as a full story, and there is about €15,000 difference. But that is much easier in new construction because the roofer doesn’t care whether he works a meter higher or lower. You, on the other hand, have to take down the roof, raise the wall, install windows (or do you want 2m walls without windows?), insert a new ceiling for the attic, and redo the roof. That will definitely cost you significantly more.

I have now made a few inquiries if the extension costs me about €80,000 and the conservatory + knee wall only €30,000, then of course I would go for the cheaper option.

I strongly doubt the prices right away for two reasons: firstly because of the amount, and secondly if the roof raising is supposed to be the cheaper option. N.E.V.E.R !!! Who did you even make a "few inquiries" to? I don’t recall the names right now because steel prefabricated houses are an absolute niche - but to my knowledge there are only about half a dozen providers Europe-w-i-d-e (!) ; and as I already said: you can only take the original builder from them because each has their own "system" and I firmly assume that none of them would want to rebuild the work of one of their competitors - even if you have all the construction plans, no.

The title of the thread also fits our current situation: A single-family house from 1960 can be purchased cheaply, living area 106 sqm. "Problems":
- Bathroom on the 1st floor too small, only has a bathtub, no shower.
- Upstairs "only" 2 (large!) bedrooms, which could become 3 small ones through room division
- Knee wall on the 1st floor is actually 0cm, but was artificially raised to 80cm with built-in drywall panels (is basically storage space between the knee wall and the roof!)
- Poor/no insulation of the roof in the area of the current knee wall (so behind the drywall panels / in the storage space)
--> Therefore: The roof should be stripped and newly insulated and covered anyway, possibly at the same time "living space enlargement"

Has anyone done this? Roof stripping, dismantling the roof truss, building up 1m, new roof with suitable insulation?
What cost range could this be in? The ridge should remain at the same height, a pure roof raising is not an option due to the lack of insulation.

The title of the thread also fits our current possibility:

No, it does not, and I also do not yet see whether you have the possibility as you imagined. It’s best if you submit your conversion request as an independent post. This is about a kneewall, whereas you have a dwarf wall. Unfortunately, despite all linguistic confusion, these are by no means the same, but only something seemingly similar in a completely different way ;-) and by the way, "11ant Drempel" / "11ant Kniestock" should enlighten you on this. That is already a classic that I have dealt with repeatedly. In your gable view, I believe I can recognize saddle roofs. That is a strong indication of a roof construction that will require at least significant course corrections for your plans. But more on that, preferably in your thread on the somewhat different topic after all.

No, it does not, and I also do not yet see the possibility as you imagined. It is best if you post your conversion request as an independent thread. This is about a knee wall, whereas you have a dwarf wall. Unfortunately, despite all linguistic confusion, these are by no means the same, but only something seemingly similar in a completely different way ;-) and by the way, "11ant Drempel" / "11ant Kniestock" should give you enlightenment on this. This is already a classic that I have dealt with repeatedly. In your gable view, I think I can recognize counter battens. This is a strong indication of a roof construction that will likely require at least significant course corrections to your plans. But more preferably in your thread on the truly different topic.

Ok, thank you very much, I will do that, thanks for the hint.