ᐅ Soil survey and land surveying when planning a building extension

Hello everyone,

I need your expertise. For a planned extension to an existing single-family house, is a soil survey and a site survey required?

When the single-family house was originally built, no soil survey was conducted by the owner.

What do you recommend? Is it absolutely necessary or advisable for personal protection? Or can it be omitted under these circumstances?

I look forward to your responses. Thank you very much and best regards.

Aside from the fact that it might be mandatory: this generally forms the basis for all structural calculations and is therefore also relevant for liability. Honestly, I wouldn’t save money on this.

We had to have the property surveyed for our extension because there was no official plan available for our plot. Our neighbor still had one from 1938, which the authorities reluctantly accepted.

Always get a soil survey when building. You should never cut corners in the wrong area. What you save on the soil survey will likely cost you twice as much later on either in an oversized foundation for safety or in repairing settlement cracks.