Floor plan design single-family house (city villa 140 sqm) on a slope with double garage

What is your absolute pain threshold with everything, so that everything except lawn, fence, and little trees is set up? Because 250k€ is totally unrealistic

Well, eventually it comes to an end. I think 250k€ is already a lot, especially since the land is already paid for. The amount should "only" be enough for the house somehow, if possible!?

I would have seen 1400 euros plus additional costs (these are higher at Hang) as an absolute lower limit. No anthracite-colored windows, no large-format tiles, etc., energy saving ordinance, no bay windows, etc.

Do you want to build stone on stone, timber frame, solid wood, or does it not matter to you? Much or little own effort?

Look for talks with architects, construction companies in the region and with those from other regions. Decide what kind of equipment you really want. Visit a tile studio and have a look around. Visit a prefabricated house supplier’s exhibition and see what is standard.

With that budget, he can only go to a general contractor with a predefined standard and cost framework.

With an architect, you go crazy with uncertainty about the costs given the budget.