Taking over the house - Payout to the siblings

Thank you for your answers. They have already helped me. When an appraisal is made, the renovation costs incurred are taken into account in the form of a lower value.

Regarding my parents' living situation: There is this paid-off house and a paid-off (and rented) apartment: However, my mother does not want to live in this apartment, so another one will be purchased.
Who will take over the house is also not yet clear. It will still take a few months until this is settled.

The appraisal determines the market value. Whether someone would want to install Ideal Standard or Goldhahn is irrelevant for the current value.

Terminating a rented apartment due to personal use is nowadays very, very difficult and therefore a subordinate option.

Here you would go to the expert committee of the district and order the valuation report there. Then three people come, an architect or engineer who assesses the building condition, a real estate agent who assesses the market value, and a surveyor engineer who assesses the land registry and land register. These three inspect the property and then agree on a report with a well-founded value. This service must be paid for, but in SH it is a great method to determine the property value. Possibly this option also exists in all other federal states. Karsten

When an appraisal is made, the renovation costs incurred are taken into account in the form of a lower value

Yes; a renovation backlog is included in the value of the property. However, this reduction is by far not sufficient to bring the object into the condition

I deal a lot with [Gutachterausschüssen] and have even worked on a [Gutachterausschuss] myself. I don't think much of the committee, find an appraiser and real estate agent from the region, they can best assess the building fabric and market activity.

Here you would go to the expert committee of the district and order the appraisal there.

We also commissioned an expert committee of the district for a house from an inheritance, with the result that today we are discussing how much more the house is worth than the expert committee determined... They already set the value extremely low; realistically, the house is worth at least 50% more.

One could also choose the perhaps not quite refined way of letting a broker come and have the house appraised. In our case, we will play with open cards and consult the broker from our house bank for an assessment. If we then sell our house on the market, he will also receive the contract. If not, we will sell the house within the family at a certain discount from his valuation...