Floor plan single-family house 110m² - ground floor + upper floor - first draft room layout

Can you explain more precisely what the legal requirements are regarding the room in the attic? That must be clearly defined. Would it possibly be allowed to set up a play area for the children there? I would take a very close look at it. The space must be good for something. And from when is it allowed to be used as living space?

We live in a 100m2 terraced house. Everything works wonderfully. But for us on 3 levels, our house has different external dimensions. We have a "large bathroom," which is still smaller than the second bathroom in most homes here, and on each floor a toilet with a washbasin. In tighter conditions, simple floor plans without convolutions and focusing on what is really necessary help. You can't avoid compromises. But then you have a house later where you don't have to clean yourself to death and have lower energy costs and that still fits you when the children have moved out.

The attic is not allowed to be living space but only storage space. No water pipes, underfloor heating, etc., may be installed. To my knowledge, the conventionalization is due after 15 or 25 years.

Start drawing yourself. Breathe life into the floor plans. This is not the planner's job. Sofa, table, bookshelf, sound system, etc. How should he know about your shoe collection and the overly long bed?

Everyone here has moved furniture and walls; everyone has made compromises. It is a squaring of the circle.

How is your couch/sofa/TV behavior? Is a slouch couch with wall shelves enough, or does it have to be the showcase sofa with side table? I once had a REH with 116 sqm plus cellar without an attic. It wasn’t cramped downstairs.

A slouch couch is totally enough for us ;)

No water pipes, underfloor heating, etc. may be connected either.

Therefore, the empty conduits are for later, that is possible in any case.

Yes, it is appropriate here to engage with the Bauhaus style as a source of inspiration. Hardly any style has brought the essential so much into the foreground; some actors of the Bauhaus dealt with the rational-functional use of space – such as the great and rarely mentioned architect Margarete Schütte-Lihotzky. It can be said that the Bauhaus school laid a crucial foundation for what we today call "modern." (That it has become common to call everything angular and with a flat roof "Bauhaus" is just as absurd as calling a station wagon "sporty" and is pure marketing hype. – I just couldn’t resist...)

As much as I appreciate the Bauhaus and especially Margarete Schütte-Lihotzky, the Bauhaus style can only be implemented with lots of space given the mass of items that people own today. It was already like that in the past. The sleek style of the Villa Tugendhat is only possible thanks to the many utility rooms that the visitor does not see.

100 years ago – so in the Bauhaus era :) – an average household in Germany managed with around 180 items. Today, according to the Federal Statistical Office, Germans hoard around 10,000 things in their four walls. With such small floor plans of less than 30 sqm per person, I would lean more toward the American style and plan built-in niches, wall cupboards, room dividers. Especially the partition walls between bathroom and bedroom and between the children’s rooms offer such solutions – instead of space-consuming walk-in closets, pardon, dressing rooms. Design wardrobes so that you switch between winter and summer clothes and store the unused clothing in the attic.

So what is completely unclear to me personally:

- 2 balconies -> additional cost 20k
- children's bathroom + 4th toilet in the basement -> additional cost 15k
- fireplace -> additional cost 15k
- glazed corner window -> additional cost?
- triple underground garage -> additional cost????
....

That all sounds like a luxury palace and are things we didn't even afford with 160sqm because it's too expensive. But that doesn't fit at all with the mandatory funding for the 110sqm or is there 50,000€ or more for that? So, to put it differently, why don't you give up the 110sqm?