Demolition of property and new construction at another location - PFC contaminated soil

Good day everyone,

we have been searching for a house/land for quite some time. Now we have found something. It is a nearly 700 sqm corner plot. On the plot there is a non-basement existing building (100 sqm living space) with double garage from around 1950. The house has severe moisture damage. Therefore, demolition is the preferred option for us.

Since the house is currently located in the southern part of the plot, we would like to demolish it and realize the new building in the northern part. However, there is a special feature regarding the plot. It is a PFC-contaminated site. It was completed in 2018. Since then, all excavated material must be disposed of as hazardous waste.

Is it now possible, after demolishing the existing building, to fill the open ground area with the excavation from the new building? This way, there would be no disposal costs. At least the responsible building authority gives approval for this, since the excavation does not leave the plot.

Is this also possible in practice? What else do you think should be considered in such a relocation of the building site? Electricity and telephone are currently connected via a rooftop pole and will then be converted to underground cabling.

Thank you very much in advance and best regards

Contaminated sites... a sensitive topic!

Before you get involved, I would demand a written approval for reuse from the authorities, usually the environmental office, if it exists in the municipality. I could imagine a problem with the groundwater there.

All excavation must definitely be sampled in such cases and then properly disposed of. You will have the same problem with the garden design.

It takes good nerves and above all a thick wallet. It quickly becomes six-figure.

I would stay away from that. Especially the issue with the groundwater can hang over your head the entire time. In the worst case, a authorities might want a complete replacement of the soil in a few years if they find out that it is seeping into the groundwater.

I would keep my hands off that. Especially the issue with the groundwater can hang over your head the whole time. In the worst case, a government agency might want a complete replacement of the soil someday in a few years if they find out that it seeps into the groundwater.

This is a whole area that is contaminated. It is already in the groundwater as well. That is why there is the restriction that groundwater may not be used for irrigation. Actually, nothing more should come from the authorities. The issue has been known for over 5 years anyway.

What else do you think should be considered when relocating the building site in this way?

Does the building envelope allow it? Basically, the same applies as for new construction: floor area ratio, distance areas, building envelope, building application, etc.