Construction financing of a two-family house in the second row

Thank you very much for the suggestions, that was already very helpful! And yes, the plot is located in the town center. A building ground survey is already planned. The price per square meter is just under €11... Thank you for the remark, I will definitely be open to building only a single-family house! The house will be attached to the boundary with the property with house number 16 (the plan was basically like a kind of semi-detached house, so there would be no eaves towards the boundary).

Which construction methods for prefabricated houses/solid houses are recommendable?

Briefly about the price:

Without a basement: should fit quite well. With a basement: oops, very tight fit. Then the question arises what kind of basement is needed and how the actual additional construction costs (development) will turn out. Just for the basement alone, you could end up in the six-figure range (1,000€/sqm is a good guideline). Then there is not much left for the house including additional construction costs. We won't even talk about exterior facilities, etc.

Welche Bauweisen bei Fertighäusern/Massivhäusern sind denn Empfehlenswert?

Construction method with walls, ceilings, roof and windows ;-)

Otherwise, in the end, it does not matter whether you build monolithically, with ETICS, double-shell with clinker, timber frame or solid concrete. Each has its advantages and disadvantages. But all are basically recommendable. Even self-build with Ytong kit houses can be recommendable.

The house will be attached to the boundary of the property with house number 16

Says who?

(the plan was basically like a kind of semi-detached house, so there would be no eaves facing the boundary)

Then, of course, all my words about uncoordinated semi-detached house construction apply (forum search: Goalkeeperthread). You should consider the idea of a shed roof, ideally with the ridge lower than the firewall.

Which construction methods are recommended for prefabricated houses/solid houses?

Whether a "prefab" house is feasible depends on how accessible the building site is from the rear. Discuss this with the architect (without quotation marks! A construction draughtsman’s plan would be the gateway to disaster).

On the one hand, the topic of prefabricated house vs. solid house, I am still open on this. I have read that a prefabricated house hardly falls short of a solid house in terms of quality. However, there have been a few hints that in a prefabricated house in summer, the heat accumulates a lot and the sound insulation is not so good? Is a solid house still that much more expensive than a prefabricated house? What are your experiences with prefabricated houses, which providers have you built with (Rhein-Neckar district)? What type of heating do you use? What insulation material would you recommend?

Many questions, for which there are subforums with extensive threads that should clarify these questions a bit.

Then the topic of development, how is it if the plot is already developed? Is it connected to the already existing supply lines here?

You have to pay for your own connection; they then tie into the existing supply at the street.

Does the ground necessarily have to be dug up? (From the middle of the street to the new house is about 35m)

Yes, certainly.

I have already designed a first floor plan and I would appreciate your constructive criticism.

Please ask that in the appropriate subforum.

You are dealing with the obligation to fit in and so-called de facto building windows. I would not rely on this only ending with the barn of No. 18;

I think so too. I doubt whether you are allowed to build as you want.

located in the town center. A building ground survey is already planned.

That still says nothing about official buildability.

The sqm price is just under €11…

Even this low value makes me doubt whether this is building land.
A shed is not a “residential building.”

Just this low value alone makes me doubt whether this is building land.
A shed is not a "residential building".

Hello , in my opinion, the 11 euros is the expected rent per m2. That is what I asked about.

Unfortunately, there is too little known about the construction project. It looks great, though. But with boundary development without a setback area, it won't work. Especially since building in the second row is not allowed everywhere.

I had also rebuilt my old collapsed barn. Even before the actual house construction. Solid with 36 cm walls. Because the barn, like yours, is a boundary development and extends into the neighboring property. If I had torn it down, the property would have been lost.

Try drawing your house with at least a 3 m boundary setback. Let's see what remains.

And you really don't want the trouble of a landlord either.