Rough cost estimate house renovation built in '73 - appraiser

This picture could already be seen in the exposé and at first I thought it was just extremely poorly installed.
Can water damage cause the substrate to warp so much that the tiles look like in the picture and all remain intact? Wouldn't they all have to be loose then, like laid on sand?

Now the question is whether it makes sense to send an expert again or to leave it alone. Because we don't have money for an expensive repair!

An expert is always good when there are serious doubts. If you still want the house, then get the expert.

This picture could already be seen in the exposé and at first I thought it was just extremely clumsily installed. Can water damage cause the substrate to bulge so much that the tiles look like in the picture and still all remain intact? Wouldn't they all have to be loose then, as if laid on sand? A surveyor is always good when in strong doubt. If you still want the house, then get the surveyor.

They canceled because even a repair over €20,000 would exceed our budget. Bulges across the entire basement can never be caused by water damage. That's my opinion.

Canceled because even a job over €20,000 would exceed our budget

Maybe still a good decision. You always need a buffer for renovations.

Bowing across the entire basement can never be caused by water damage.

Just asking around: Where can such bowing even come from? The house isn’t that old to have been built on wood without a concrete slab.

Bowing does not have to be caused by the settling of the house. Lack of workmanship can also be the reason – and often the cellars were tiled by oneself:

[*]No attention paid to expansion
[*]No good adhesion to the adhesive
[*]Poorly prepared substrate
[*]Moisture in the subfloor can also be caused by incorrect cleaning or other water sources

The tiles shown are most likely not stoneware tiles, but earthenware. They react somewhat differently to water and can become brittle over time, so they no longer withstand expansion movements caused by moisture and temperature fluctuations. In addition, there is always some concrete shrinkage. The combination can create such a tile pattern without real damage when you want to tear out the tiles anyway.

I think I expressed myself incorrectly, the bulges were everywhere, in every room, including those with stone floors.

I think I expressed myself incorrectly, the bulges were everywhere, so in every room, even with stone floors.

I think when it comes to such things, the building intuition is simply important. If the property is rated at the upper end of the scale for you, and the buffer is low, there shouldn't be any obviously odd conditions.