Too few incidental construction costs or is the cost breakdown okay?

So the HOAI is not a benchmark for the costs?

... I would consider talking to a prefab house builder .... because those 53,000 € plus the costs for financing and repayment would be too much for me personally, as they are in a reasonable proportion to the house costs .... besides, the 54,000 € for building services are up for discussion ... please for what? why? how come?

... because they are not in any reasonable proportion to the house costs

.. the "k" was missing there

The previous prefabricated house offers were unfortunately already significantly above the architect's offer at Kfw 70 (despite the high architect fees!) and did not yet include a garage... :(

@ Bauqualle: what value would normally be used for the technical systems? water, wastewater, possibly gas, heating, ventilation, and electrical installations are included

Hello,

I can see... I need to break down the individual items from our offer more precisely:

This doesn’t really make the evaluation any easier because you or your architect maintain a – at least for me – unusual compilation of the costs.

Currently we are still in the preliminary planning, so much is generalized. Own contributions have not yet been deducted, and the architect’s fees are the complete package, so they will also still be reduced.

You can free yourself from this assumption that the architectural costs will decrease because you contribute own work. Whether the production of individual trades is awarded externally or done as own work does not change the chargeable costs as the basis of HOAI.

The architect has been focusing on passive houses for over 20 years and says the values are empirical values from his projects.

Maybe in the first step you can clarify the terminology for us. What exactly does your architect or you understand by a “passive house”? And then furthermore upload the floor plans of the planned new building here. Maybe this way we will get closer to the matter...

@Bauexperte: The exterior walls will be timber frame construction with a wall thickness of 50 cm at least on the ground floor

I am aware of that, or have read it. I wanted to make clear to you where the costs are for a solidly built single-family house of the KfW 70 category. Prefabricated houses are generally – at least when not from low-cost providers – significantly more expensive ;)

Incidentally, with your architect’s offer it is such that the costs – as you rightly noted – will still be specified. According to all experience, however, rather upwards than downwards ... which also lies in the nature of the matter itself.

Rhineland regards

The previous prefabricated house offers were unfortunately already significantly above the architect's offer at KFW 70 (despite the high architect costs!) and did not yet include a garage... :(

.. I can't imagine that, because prefabricated house builders are usually cheaper... does the architect guarantee the total production costs?

.. I can't imagine that, because prefab house builders are usually cheaper ... does the architect guarantee the entire production costs?

If you have it done properly, and not just with thin cardboard, it gets more expensive :) We had both options offered to us, and then decided on the more expensive variant because it had more advantages for us.