Thank you for all of your responses! Indeed, we have considered the situation having a vengeful seller and possible gossips and bad feelings spread around in the neighbourhood. That is why our enthusiasm about the purchase is also subsiding. However we still wrote the seller a letter today in which we ask to see the ‘diagnostic d'assainissement non collectif’ in order to be able to consider the situation and to possibly find a friendly solution to it. If she does not agree to letting us see it, it is clear that her reasons are only excuses. Our notaire did tell us, tough, as much as that the pre pre contract which is signed is binding her too. If nothing else, at least we have learned from this incident. And maybe we should indeed be happy if we get out of it without further costs. I am not sure if I understood pachapapa correctly, but is there somewhere a forum concerning SPANC questions? If so, would you be able to add the link here?