Plot Single-family house New development area

Wait, we never talked about 180sqm,

The floor area was never the topic.

But your requirements foresee much more than these 180sqm:

Our requirements were:
...
... "party room"

Just an age-appropriate office/bathroom on the ground floor already requires more sqm. In a 10sqm office, you simply can’t place a double bed with age-appropriate distances to walls and a 3-meter wardrobe. Handling is also not age-appropriate in a 4sqm shower bathroom. Then the wish for a party room, so then the >€100,000 expensive basement... overall a lot of fuss in the wishes that requires space.

For me personally, the age-appropriate wish already contradicts having a basement... but I stopped preaching about that.

not too complicated and build cost-efficiently

You have to take the blinkers off yourself.

Okay, do you see the current plan (with 146sqm + basement) as realistic for our budget, or isn’t even that enough? I think I’d rather give up the ideas of age-appropriate preparation than the extra space (party room and workshop were just an example, it’s not a must-have, but if there is "leftover" space in the basement it has to be used ;) ), but if even that isn’t possible I have no problem accepting that and trying to accommodate the basement rooms on the ground floor/upper floor.

You often read this from young builders these days, bathroom and office on the ground floor should be age-appropriate for possible living on one level. But for that, the rooms are simply too small in terms of square meters. Of course, you can create a compact office that fits a double bed and a wardrobe and put a shower in a guest toilet. But that really has nothing to do with "age-appropriate." Even without a wheelchair and without a caregiver, you need space in old age to move safely, but certainly no narrow spots.

My parents built a new house again in their early 50s, purposely so that the house could be divided into 2 separate apartments. But everything there is much larger in size so that it really makes sense in old age. They still occupy both floors in their mid-70s and don’t even dream of separation and living on one floor; by now, they would rather install a stairlift. What I want to say is: you can’t plan for all eventualities, who knows what will happen then. You want a house now, it should and must fit now, and affordability is part of that.

You also don’t have to have a finished plan drawn up by this company to then inquire with others; another company has different floor plan ideas, perhaps even better ones. Of course, it’s a different matter if you hire an independent architect and refine the floor plan with them until you have the perfect layout for you, and then approach the general contractors with it.

Okay, do you see the current plan (with 146sqm + basement) as realistic for our budget,

Do you mean the one from #11? I see some bottlenecks there: for example, no wardrobe at all... well, other small mistakes can be fixed without immediately getting bigger. You can calculate that yourself: 146sqm x at least €3000 = €438,000, so €450,000 Basement 75sqm: €75,000-€100,000 as a usable basement without heating (rather €100,000), heated higher costs, around €100,000 - €150,000 (rather €150,000). Just for the house. Additional costs for incidental building expenses, garage or parking space and landscaping. (The calculation does not foresee any significant additional costs except for painting and flooring (before some here again think everyone must be as great as they are, who have done a lot of DIY)) By the way: the ads are covering all texts again, on the phone only half visible, due to some redirects no new posts are visible via Firefox or Safari.

Either your information about the property (16*30m) is incorrect or your plans are wrong. Is there a survey plan of the property?

75sqm basement: €75,000-€100,000 as a usable basement without heating (rather €100,000), heated higher costs, estimated €100,000-€150,000 (rather €150,000).

Sorry, I think I wasn’t at a minimum of €1500/sqm basement... (that was once used as a calculation factor a few years ago)... but with a heated party room I consider €150,000 quite realistic.