Realistic construction costs & financing planning?

Yes, however, it must be said that the terrace with 50sqm is rather large, roll lawn is also a point that is not necessary, and the awning is probably more upper segment. But still, everything costs money and doesn’t get cheaper. So under 15K will already be difficult in that size range, I think

The costs for the outdoor facilities can also vary greatly. I see your cost estimate in the quoted post as very realistic and rather a lower minimum. For outdoor facilities on slopes, you can quickly add another 50% (or more). Although we do not have a slope and only half the size of a property compared to you, we have planned around 38k for the outdoor facilities. If you – as you yourself say about your terrace roofing – have a few demands here and there, it is spent quickly. And we initially planned the outdoor facilities as a contract work, so labor costs will be added if you only consider the material. What we will ultimately do ourselves can be seen once we know how much money is left after the house construction. From what I have read so far from the OP, the planned budget should be sufficient if done as own work. *Edit: My sister-in-law and her husband, for example, bought garden furniture for just under 30k. I really don't know what to say to that anymore.

My sister-in-law and her husband, for example, bought garden furniture for almost 30k.

That is not an estimate. Those were my actual costs. Or did I misunderstand your post?

For the entire street, right? 10 tables, 100 chairs. :D

No, only for the "designer" corner sofa and the table. I should maybe add that the associated property including the terrace is located in Amiland, but that probably doesn't make it any more understandable in general.