ᐅ Foundation incorrectly positioned – what is the recommended course of action?

Hello everyone,

Unfortunately, during our new build today, we discovered that the foundation was positioned incorrectly on the plot. The concrete slab has not been poured yet. Because an incorrect boundary marker was assumed, the foundation formwork is located 3 meters (10 feet) too far back on the property. We briefly considered accepting this and submitting a new building permit/planning permission, but ultimately decided against it due to the lack of a garden.

The site manager immediately admitted the mistake. The plan now is to move the foundation forward by 3 meters (10 feet). From what I understand, a section will be added at the front and connected to the rest. At the back, another new section will also be added and connected—the 3 meters (10 feet) of overlapping “remainder” can stay, according to the site manager, as a terrace at the level of the sliding door is planned there anyway. The wastewater pipes and other utilities will, of course, also be relocated.

I am a layperson and honestly relieved that the concrete slab hasn’t been poured yet. However, I am wondering if this is the correct approach. Or should everything actually be removed and redone? I don’t want to cause unnecessary work and am satisfied with a reasonable solution. What is structurally sound and acceptable in such a situation? How is something like this typically handled in practice?

Good luck

You are not the only non-expert here; your "site manager" obviously is one too (or his thinking is accidentally off by about three meters). His problem seems to be that his budget authority doesn’t extend much further; and his boss will be very happy with the "solution": a serious mistake, but with obvious consequences only well after the warranty period expires. You should strongly protest this poor work by all means!

It’s not only structurally flawed to place the house on two separate concrete slabs, but also problematic from an energy efficiency standpoint because the misplaced slab section creates a prime thermal bridge. I’ll call in @Jann St...

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The proper procedure would actually be to have the stakeout performed by a surveyor; it is new to me that the construction manager is allowed to carry it out personally. In our case, the detailed stakeout plan was required as a condition in the building permit / planning permission.

11ant schrieb:

...to place the house on two separate slabs; but also from an energy perspective, because the misplaced slab section creates a perfect thermal bridge...

see here 🙂 (symbols symbols symbols)

lars909 schrieb:

The slab has not been poured yet

sergutsch schrieb:

The correct procedure would actually be to have the site layout done by a surveyor. I am not aware of the construction manager being allowed to set it out personally. In our case, the detailed site layout drawing was required as a condition in the building permit / planning permission.

I would even strongly recommend having it completed afterwards or at least checked and confirmed.

Hold on. Before going into too much detail here.

This is about the strip footings beneath the formwork blocks. NOT about the slab foundation. That has not been poured yet.