ᐅ Costs for soil replacement, geotechnical survey of the building site, clayey soil

PhoenixDH schrieb:

And one last question so it doesn’t get lost... Where should the drilling be done if the building envelope isn’t fully finalized yet?

Is it specified by the municipality or city exactly where the house should be located? So even if the dimensions of your house aren’t finalized, is there a building permit area or planning permission zone defined by the local authority?

Otherwise, ask the geotechnical engineer. They usually have experience with this.

Alternatively, you can have the geotechnical survey done once you know the size of the house and its position. Unlike undeveloped plots you plan to buy, you already own the land, and you intend to build on it. Therefore, it might be possible to carry out measurements at a later stage.

I made a mistake with the building envelope!
Of course, we have one; it is marked on the development plan. The building site is at the end of a dead-end street.
We only need to stay 5 meters (16 feet) away from the road; the rest of the property can be built on freely, according to the law.

I will now look for providers to have one created, as I have all the information thanks to you.

The geotechnical survey should be conducted at 2-4 key points of your house’s foundation. The main goal is less about whether the house will collapse and more about preventing excessive settlement.

Plan your house, have the soil survey done within the foundation slab area, and provide the foundation recommendations to the earthworks contractor. By the way, it’s worth comparing prices here. The construction company’s own survey may be much more expensive than a regional one. I wouldn’t outsource the foundation slab work. If something goes wrong, you’ll be the one who suffers— for example, being a few centimeters (inches) too far to the left or the sewer connections not fitting properly.

Well, usually a geotechnical site investigation is done before purchasing a plot of land. At this point, it’s probably too late, so you can still wait a while.

For us, there were almost 10 months between drawing up the plans and the start of construction, so there was plenty of time to arrange all of that.

As mentioned, the building plot was inherited, and it is certain that if we build, it will be on that land. So the appraisal was no longer necessary beforehand.

Hello,

PhoenixDH schrieb:
I asked the company responsible for the foundation slab today, and they said the soil report isn’t needed.

Make sure you get that statement in writing!

PhoenixDH schrieb:

Here is the excerpt:

It is recommended to prepare a soil report specifically for your building site, in order to clearly define any potentially necessary measures regarding the foundation.

So the report should be done to be on the safe side and be able to take action, right?

That is a clause that protects the concrete contractor from liability on your part, in case the foundation – due to the absence of a soil report – ends up being problematic.

Best regards, Bauexperte