ᐅ Ground source heat probe in a former mining area

Hello,
we are considering buying a house from a developer. The standard option includes a gas heating system plus solar thermal panels, while an upgrade to a ground source heat pump with KfW55 standard would be possible for an additional cost. Due to the repayment subsidy and other effects on the house planning, the ground source heat pump might be cheaper or, at the same cost, allow for an approximately 4 kW photovoltaic system.
So, we are basically weighing gas heating plus solar thermal versus ground source heat pump plus 4 kW photovoltaic. We are generally in favor of the ground source heat pump, but the house will be built in a former mining area. The mining company has provided confirmation that no problems are expected. However, what if the probe fails due to underground shifting? The mining company would likely avoid liability, and even if they did not, a legal process would take a long time. This means having to commission a new borehole at one’s own expense, which probably wouldn’t be cheap.
Does anyone have experience with this? What are the costs for a new borehole/probe once the house is completed, and are there any known cases in former mining regions?

DamDumDob schrieb:

But what if the probe gets damaged due to underground shifts? The mining company will try to avoid liability, and even if not, a legal process would take a long time. This means you would have to arrange a new drilling at your own expense, which likely isn’t cheap.
Are there any experiences with this? How much does a new drilling/probe cost after the house is built? Are there similar cases in former mining regions?

If mining damage occurs and no mining damage waiver is registered in the land registry, the mining companies or their legal successors will handle the damages smoothly and promptly. Although there might initially be some disputes and appraisers from the companies, in the end, the process usually goes very smoothly.
Also, the probe will be your smallest problem if, for example, the house suddenly becomes tilted or something similar (experienced personally within the family in the Ruhr area).

I’m not talking about major damage that would cause the entire house to lean, but rather minor issues that might not be noticeable on the surface yet could damage underground probes. Our construction project is also planned in the Ruhr area. The concern is that the mining company may not acknowledge this, and we fear that obtaining judicial proof would be hardly possible.