Estimate of construction costs for a single-family house in the Tübingen area

I'll start "backwards" (in the order of your words):

If a feasible result comes out of this, I am more relaxed and the realization path will emerge in my opinion.

That a "feasible" outcome is seen for your project has been confirmed here several times and without any dissenting voices. So the house will definitely work, and the uncertainty whether it will also be sufficient for the honeycomb frames around the light switches cannot be cleared up in advance.

We sift through floor plans on Pinterest, catalogs and the like, but a really plausible check whether the budget can realize the dream or if it remains a dream that is too expensive - that is our obvious next step to clarify.

Loading yourself up on the Internet with little dream house pictures is in your case only mildly dangerous insofar as the plot is flat and not worryingly tiny and therefore not many ideas will crash against the reality of possibilities. The "setting the course" is the appropriate plausible check – how it works and what it costs you know. Currently, you can still have the result before the summer holidays; your hesitation is "the only handbrake."

No, we don't want that. On the other hand, however, we have a tight budget and pretty volume-intensive ideas.

Volume in terms of building mass or in terms of surcharges for electric window openers, for shower glazing, and a front door with individual polyphonic doorbell tones to distinguish between mother-in-law and Zalando delivery person?
Or are you afraid that you won’t be able to afford the house anymore because the money has already gone for the architect’s fee? – I could tell you that a "service phase 1 to 3" fee for a basic floor plan draftsperson would probably be the safest learning expense.

I'll start (in the order of your words) "backwards":

That a "feasible" approach is seen for your project has been confirmed here several times and without any opposing voices.

We basically see feasibility as well; it's more about adhering to our desired floor plan concept regarding costs --> Architect necessary to plan space-efficiently and realistically.

how it works and what it costs, you know. Currently, you can still have the result before the summer holidays, your hesitation is "the only handbrake."

The notary appointment will take place in June, the soil survey appointment is scheduled for next week. The search for an architect (I'm only using the gender form this once) is now the next step. In parallel, we have appointments with companies like HEFA, Hauser and co to get to know the companies and get a feel for who they are? How do they build? What do they offer, etc. Purely getting to know them.

Volume in terms of building mass

Yes exactly, what square meters are necessary for the desired floor plan. 135sqm? 150sqm? There are, as I assume, rules, standards, DINs, etc. considering the statics and co., which lead to a floor plan draft.


Another question:

Can you generally recommend a "house building fair"? I think it probably won't hurt, although as a layperson it could also be dangerous?

If yes, which ones?
In parallel, we have reworked the "additional costs" and allocated them better, also when they roughly occur. Immediately = before construction starts. I'll move this discussion to another thread but can also continue it here, so I included it.

Green is very certain, red are estimates

Yes exactly, what is the necessary sqm for the floor plan request. 135sqm? 150sqm? There are, as I assume, rules, standards, DINs, etc. taking into account the statics and so on, which lead to a floor plan design. Another question: Can you generally recommend a "house building fair"? I guess it won't do any harm, although it could be dangerous as a layperson?

It cannot be predicted down to the square meter when the house will "feel right," there is no magic formula for that. I have already mentioned a multipart rule several times and regularly: 1. one starts a floor plan design more mathematically than pictorially, 2. when switching to the visual level, one tackles the more complex floor (almost always the upper floor) first. Inspirational floor plans are only as transferable as their room program is congruent: if one needs one more room, one must look for a correspondingly smaller model and also transgenic transfers (for example, between one-and-a-half-storey houses and instead villas) regularly turn out unsatisfactory. House exhibitions or fairs only really become dangerous if one has not previously prayed enough rosaries of the content "we sign nothing."

Your costs for the building application and structural analysis seem too low from experience, at least if an architect and structural engineer are doing it. The development of the connections might be correct or slightly too low. Your items for access path, parking space, and terrace are far too low. Even if you get a digger for free, that is not enough.