Foundation positioned incorrectly, what to do?

Hello everyone,

unfortunately, we discovered today at our new construction that the foundation was positioned incorrectly on the property. The slab has not yet been poured. Because an incorrect boundary stone was assumed, the foundation or the formwork is positioned 3 meters too far back on the property. We briefly considered accepting this and submitting a new building application but ultimately decided against it due to the lack of a garden.

The site manager immediately admitted the mistake. The foundation is now to be "shifted" 3 meters forward. If I understood correctly, a piece will be added at the front and connected to the rest. At the back, a new piece will also be added and connected – according to the site manager, the 3-meter protruding "rest" can remain since a terrace at the level of the sliding element is planned there anyway. The wastewater pipes, etc., will naturally also be shifted.

I am a layperson and, to be honest, still glad that the slab hasn’t been poured yet. Nevertheless, I am concerned whether this is the right approach? Or does everything actually need to be removed and redone? I don’t want to cause unnecessary effort and am satisfied with a reasonable solution. So what is structurally okay and justifiable? How is something like this handled in practice?

Best regards

You are not alone layman, your "site manager" obviously is too (or his brain is accidentally also three meters off). His problem is that his budget authority probably doesn’t allow for more; and his boss will be very satisfied with the "solution": a serious mistake indeed, but with obvious effects only well after the warranty expires. You should protest this botched job by all means! It is not only structurally nonsense to place the house on two slabs; but also energetically, because the misplaced slab section creates a first-class thermal bridge. I’ll call in ...

Actually, the correct procedure would be to have the staking done by the surveyor; the fact that the site manager is allowed to set it out personally is new to me. With us, the final staking plan was required as a subsidiary condition in the building permit.

...to place the house on two floor slabs; but also energetically, because the misplaced floor slab section creates a first-class thermal bridge...

look here :) (characters characters characters)

The floor slab has not yet been poured

The correct procedure would actually be to have the staking done by the surveyor; it is new to me that the construction manager is allowed to lay it out by hand. With us, the fine staking plan was required as a subsidiary condition in the building permit.

I would even strongly recommend catching up on it or at least checking and confirming it.

Wait. Before going into such a massive explanation here.

It is about the strip foundations under the formwork blocks. NOT about the slab. This has not been poured yet.