The subsequent search for the cause led to us almost literally leaving no stone unturned...
When we then opened up the outside deck to see if anything was happening underneath, we found out the builder had not been very diligent in putting it back together after opening it up during renovation works. You can play the game of "spot the mistakes"
So Dirk then decided the deck had to go. Completely
With the upside, we can now lower the deck to a level that makes it more appealing.
In the mean time we made some makeshift steps, resulting in the fact that Mees now insist we live in a tree house (the height between de kitchen door and the outside floor is now ~ 1 - 1.5 meters.
Work in progress!!