Location of city villa or single-family house on 500 m2 plot - rectangular

think about asking the planning office for the heat load calculation if they know a specialist company, or posting the order on myHam...er, maybe you'll be lucky, there are companies that fill their gaps there

What just came to my mind while I am waiting for the credit note offer from the GÜ. Actually, I have a contract with him in which he also owes me heating and sanitation. That he only has a subcontractor for that is not my problem. Of course, it is not in my interest to let the GÜ hang like that now. But if the credit note is not adequate, I already have a kind of leverage, right?

If you have an offer with the individual trades, the credit note is already quantified; with a total sum, he can design the credit note at his discretion. He has offered a heating system according to DIN that works.

Well, if the subcontractor doesn't want to carry out the work anymore, he can offer it to me, but he cannot execute it. Also, the main contractor offered me the most efficient heat pump possible, but said I should sort it out with the subcontractor. Now he has no interest at all. Whatever.

I have now ordered from the TGA engineering office the room heating load calculation, heating installation plan, pipe network planning for drinking water and heating, and ventilation system design with volume flows. I'm curious.

Small update:
The offer for soil replacement has arrived and was better than expected. Even another civil engineer said (thanks again to ) that he couldn’t really do it cheaper or faster. Since a compaction report from an independent lab would have been required for subcontracting, we have now commissioned the general contractor with the replacement.

One question about the excavation: I don’t want to remove the excavation for now. Is it then advisable to separate it somehow? Because the top layer is topsoil and underneath there is rather humic sand? Can you actually do anything with humic sand? There is always a risk of settling, but I think as a layer under the topsoil, where there is lawn (so no paving, terraces or other structures), it doesn’t matter, right?

After the demolition, it turned out that the plot is on average lower than the street land and the neighboring plots (the previous owner had concreted over more than half of the plot), so the excavation material can also be used well there, right?

I would do it the same way, paths and structures firmly on RC, fixed edges at the borders and in between make the garden with the existing soil and topsoil above it