Building plot - who should assess it?

To what extent would an expert opinion or an assessment affect your intention to buy? I would base the effort regarding the people to be consulted for a second opinion on that. It is not entirely clear to me what you are hoping for. It sounds as if you would buy anyway because of the market situation if you get the contract. Then one could take care of the further assessments step by step in due course. Or are you hoping for a better negotiating position?

Yes, I believe that... we don't know anyone in the construction industry who would do that now. 70% rebuild! But we haven't received the contract yet and the price depends on all of that (

To what extent would an appraisal or an assessment affect your intention to buy? I would base the effort regarding the people involved for a second opinion on that. It is not entirely clear to me what you are hoping for. It sounds as if you would buy in any case due to the market situation if you get the contract. Then one could take care of the further assessments step by step at the appropriate time. Or are you hoping for a better negotiating position?

Hello Klausi, well, it's about knowing how much still needs to be done on the house, for example—or not—so whether demolition is definitely an option. All of that influences the purchase price. The price is fixed; it's only about how much more needs to be offered (has to). By the way, all the bricklayers (masters) have refused. They would not be suitable. I think we'll send an appraiser through, provided we get the contract. The only downside is that then we won't know how much it's actually worth, but we can't spend €400 for an appraisal at every house viewing ;) Buying a house without an appraiser would be risky, especially since we have an idea....

In prospect with an old house. We are primarily interested in the plot; we would possibly rebuild the house.

All of that influences the purchase price.

Well, if it’s about an old house and demolition is being talked about, then one assumes a very old house without intrinsic value and calculates accordingly: with demolition costs.
If you buy an old house itself, you actually expect to fully invest in renovation. In the past, a value for the house was used that was calculated from the market value.
A used property is also calculated this way, where you only have to modernize.

So, what exactly this is about isn’t stated anywhere, right? Do you have a construction year at hand? Have you seen the house? Or is it a prefab house with formaldehyde? According to the opening post, it’s an old shack; at the moment, I almost believe it just needs modernization and adaptation according to the Building Energy Act.
Sometimes photos also help...

Well, if it’s about an old house and talks about demolition, then you assume a very old house without any intrinsic value and calculate accordingly: with demolition costs. When you buy an old house itself, you actually expect to fully enter renovation. In the past, a value for the house was taken based on the market value. A used property is also calculated this way, where you only have to modernize. So, what this is about is nowhere stated, right? Do you have a construction year at hand? Have you seen the house? Or is it a prefabricated house with formaldehyde? According to the initial post, it is an old dump; at the moment, I almost believe it only needs to be modernized and adapted according to the building energy law. Sometimes photos also help...

The year of construction is 1920, so it is 100 years old... But it doesn’t look ready for demolition (at least not from the outside). It is still inhabited, so it definitely doesn’t have to be torn down. I don’t know what such a renovation costs :-( The viewing is yet to come... then I will know more.. (hopefully)

Brief feedback. Unfortunately, that was not possible; it would have become too expensive for us. Thanks again. The search continues...