ᐅ How much additional cost is expected based on the structural engineer’s calculations?
Created on: 11 Jun 2023 11:17
L
Lauralila88
Hello,
I have to admit that we approached the house construction quite naively...
We have already signed the detailed construction plans, and now the construction company wants us to waive our right to special termination in writing – is that even legal?
Now to the main question: we signed a fixed price contract (turnkey), but the site manager said that the price might change again after the structural engineer's calculations???? I mean, we won’t make any more changes to the plans, and we have already budgeted with the bank based on the known price – is this normal? It feels like buying a pig in a poke!
Best regards
I have to admit that we approached the house construction quite naively...
We have already signed the detailed construction plans, and now the construction company wants us to waive our right to special termination in writing – is that even legal?
Now to the main question: we signed a fixed price contract (turnkey), but the site manager said that the price might change again after the structural engineer's calculations???? I mean, we won’t make any more changes to the plans, and we have already budgeted with the bank based on the known price – is this normal? It feels like buying a pig in a poke!
Best regards
H
hanghaus202322 Jun 2023 12:13WilderSueden schrieb:
The question remains whether the calculation is based on the volume of in-situ soil or the volume of compacted soil. A dump truck is full based on compacted soil volume. I would prefer in-situ soil.
W
WilderSueden22 Jun 2023 13:08Me too. In addition, when calculating, you need to consider work areas and slopes. A 10x10m (33x33 ft) house quickly results in much more than 300 cubic meters. You should also account for excavations of the cistern, driveway, and terrace. Then add a surcharge for loose soil. At 56€ per cubic meter (gross or net?), costs can quickly exceed 30,000€ even though the rough estimate says 20,000€.
H
hanghaus202322 Jun 2023 19:17WilderSueden schrieb:
Me too. In addition, the calculation also has to take into account the working areas and slopes.I thought it was only about the material to be disposed of. 😉W
WilderSueden22 Jun 2023 20:30I have now lost track a bit of whether the ground has already been described in detail, but with a white tank foundation, there is certainly clay soil. This cannot be reused and compacted.
X
xMisterDx22 Jun 2023 21:56WilderSueden schrieb:
I've lost track a bit whether the ground has already been described in detail, but with a waterproof concrete shell ("white tank"), they definitely have clay soil. That cannot be reused and compacted. I’m always a bit surprised by this. Foundations are never actually built on the existing soil, right? Usually, a certain depth is excavated, then gravel or sand is added and compacted. What’s the point of putting the excavated soil back into the foundation pit?
Aside from the fact that you can’t achieve a defined grain size that way... why dig it out in the first place?
The excavated soil either has to be used for filling terrain or it must be removed.
By the way, sometimes it can be cheaper. Around here, large trucks often drive by asking if certain soil piles are still needed. They apparently load it and sell it privately for a low price... bypassing landfills, etc.
But I think that only works in larger new development areas where digging and filling go on for years.
xMisterDx schrieb:
Why bother digging it up at all?Working space. Usually only necessary for basements or underground levels built into a slope. Sand could be filled back in. Clay or contaminated soil cannot.