Single-family house with >180 sqm / basement / garage

My gut feeling tells me you will have to weigh:

1. Between basement and masonry double garage -> you can't have both.
2. Between a bit more living space and better standard -> you can't have both. And by a bit more I mean e.g. 30m² and not 60m²

And don't forget the outdoor area and don't budget only 5-10k€ for it. When the house is finished, you will want the outdoor area done as well. Favors from friends are also overrated when it comes to the outdoor area. Approach it with common sense and everything will be fine. Not exactly like in the original post but financially healthy.

Can't you save more with a prefabricated basement or prefabricated garage?

Is it possible to save more with a prefabricated basement or prefabricated garage?

A little. But it will not cover your lack of financial resources. Partially finished does not make you happy and entails follow-up costs that may also not be covered.

Make a room program - you won’t be the first to build without a basement.

And then go to a general contractor who will calculate all of this for you.

Don't build a city villa, but a 1.5-story house with a slightly higher knee wall.

With the desired size, the additional floor space requirement is likely to make the search for a plot more difficult.

Would you go through a developer in the first step?

A developer is someone who sells a (often in consultation with the buyer) developed plot. I assume you mean a general contractor (as opposed to individual awarding of trades)?

Can you save money with a prefabricated basement or prefabricated garage?

Yes, time (significantly) – money, however, not. Prefabrication doesn't save work, only the time spent on the construction site. Prefabricated garages as double garages generally do not exist; they are assembled from two partial buildings. With a common gate, this means they consist of a front and rear half. The only advantage of a prefabricated garage is as a single garage for the building setback, where the savings on wall thickness (= >> more clear width) can be well used.

Currently, the fine ounce garage generally costs a fortune.

A developer is someone who sells a developed property (often in consultation with the buyer). I assume you mean a general contractor (as opposed to individual awarding of trades)?

Then I have to ask stupidly again... A general contractor is something like Heinz von Heiden or Town & Country? Or exactly not these?

Hello,

we have exactly 198 m² with two children. With upscale fittings, we paid just under 400k, including all additional costs, kitchen, solid double garage, outdoor facilities, etc., without the land. If I were to start again today, the house would have a basement with a workshop, but two years ago the construction sum with a basement seemed too high to us – it would have cost 65k.

In BW you can probably only build for 400k with "basic" fittings and without a basement. If it comes down to that, the attic should be well usable as storage space, i.e. with a "proper" door and stairs.

Then I have to ask a stupid question again...Is a general contractor something like Heinz von Heiden or Town & Country? Or precisely not these?

Those are general contractors.