Cost of enclosed space. First draft discussed with architects

Regarding your numbers.

@Surveying: I just included it as an item. But the municipality pays for it.
@Second notary fees for the land charge ordering: Thanks for the note. I used some calculator and assumed the land charge without the land price.
@Electricity/telecom/water connection: Do you mean the connection from the property boundary to the house? True, I forgot the multi-utility connection.
@Removal of soil. Everything will be stored on the property. We have about 2.5m slope from north (street) to south (end of garden), so I do not expect removal but filling. That’s why 35k€ are planned for the outdoor area excluding carport.
- We were at just under 2,800 euros for 2 inspection shafts. Thanks for the info
- Soil report with 6 drillings up to 7, depth for us was 2,400 euros including chemical analysis. Ok
- Energy consulting we are similar. If you actually build KfW 55, you get 50% from KfW as a grant back. Important point I didn’t know. That means I effectively pay only 2,500€?

That was quick.

The 132m² are calculated without the basement, right? Whether the construction costs are accurate or not, I can only believe, not directly verify. The total value seems to me to be not too low at >300,000€. The indication of costs per converted room is always a value where you have to trust the architect. We have the "luxury" of a fixed price. Ultimately, it would also be important to look at the specifications as detailed as possible and up to the move-in readiness.

There is also a separate collection thread about construction costs that many have already responded to. In principle, the costs seem plausible to me. The garden depends on whether you really let that much be done.

For kitchen and furniture, I would budget more. Have you considered an upgraded bathroom equipment? Usually, you get a toilet and sink. If you want a different sink or a washbasin cabinet underneath, it gets four digits more expensive right away.