L-shaped floor plan - What is your opinion?

Check if there is anything written anywhere about changes due to the statics

If he doesn't have a backdoor in there (and you trust him not to repeat the difference in other items

That's exactly what I don't know... And I probably can't find out either. I'll just wait for more offers.

Check if there is anything written anywhere about changes due to the static calculations

Yes, there is. But only for the ceiling with an additional cost of €5,000, nothing more. At least, nothing else obvious.

Many have a note that additional costs may arise from changes due to the structural calculations. If something is stated in the fine print, the 5,000 euros can quickly become more.

Thank you for the hint. Then you can actually never rely on a concrete offer, regardless of the house shape, which may cause additional effort in structural calculations if there are always such loopholes... I actually expect a concrete structural calculation to be included in the offer costs. The architect also said this, she had discussed it with the structural engineer. However, since the offer is significantly higher than a second one that arrived yesterday evening, I am not sure to what extent the additional cost for structural calculations is possibly being 'covered up' in other trades.

We built on a slope. Additional structural engineering costs have been included in the
- Reinforcement
- Floor slab
- Base plate