New single-family house - Join us on this journey!

Dear community,

we are finally getting a step closer to our dream of a single-family house.
The plot is purchased, building plans analyzed, construction type decided, etc. We have now commissioned the architect of the general contractor of our choice with the planning assignment and are currently fine-tuning the house planning. I would very much like to take you along on this journey and incorporate your valuable feedback.

The current focus is on the house planning.

Regarding the framework data:
Plot: 1062m2; approx. 25.5m x 41.64m
Orientation: Northwest -> The arrow in the 3D view screenshot comes from the south

Desired room layouts:
Ground floor:

[*]Large living/dining area with adjoining (yet separable) kitchen bottom left plus gallery overlooking the 1st floor
[*]Utility room
[*]WC
[*]Garage
[*]Separate apartment top right with separate entrance for parents-in-law

Upper floor:

[*]Gallery overlooking the ground floor
[*]2x children’s rooms with attached bathrooms
[*]1x playroom (initially cinema room, later repurposed) above garage
[*]Parent wing with master bedroom, dressing room, bathroom

Attic:
Note: I am in exchange with the architect about this. Due to the roof shape (hip roof), the actual living space has shrunk too much. Therefore, further discussions will take place to accommodate the other rooms. I had underestimated the ratio of gross to living space.

[*]2 separate offices
[*]1 guest room
[*]1 small guest bathroom

Basement:

[*]1 technical room
[*]1 laundry room
[*]1 storage room
[*]Large fitness room
[*]Wellness room with sauna

Additional plans:

[*]Air-to-air heat pump or air-to-water heat pump
[*]Photovoltaics with/without storage
[*]Possibly pool (3.5/4m x 8m or 3.5/4m x 12m) with heat pump (and counter-current system)
[*]Sauna in the basement room
[*]Air conditioning of various rooms
[*]Smart home – probably via KNX
[*]Garden: Currently 2 terraces planned – 1x to the left somewhat more south, 1x towards main part of the plot more north

Now to my first questions for you:

[*]How do the floor plans appear to you? Are they logical with regard to the dynamics of family life?
[*]The arrangement of the separate apartment was made according to our wishes. We wanted a strict clear spatial separation with a separate entrance. Do you have any comments on this?
[*]Do you consider the utility rooms in the basement to be sufficiently sized (keyword KNX, heat pump, ...)?

My biggest construction pain at the moment is the room layout in the attic. There are two alternatives:
- Different roof shape, which generates larger living space in the attic at higher costs
- We give up the playroom on the upper floor, make it a guest room and build only the two office rooms in the attic (no guest room, no bathroom)

Thank you in advance for your comments.

At a glance, I find your wishes quite well implemented. What I absolutely do not like, however, is the layout of the [Einliegerwohnung]. Sleeping with your head by the garage and the bathroom as a room divider, the chill corner practically as a pass-through room – I would not want to live there.

I quickly find your wishes quite well implemented. What I really don't like at all, however, is the layout of the granny flat. Sleeping with your head toward the garage and the bathroom as a room divider, the chill corner basically functioning as a passage room – I wouldn't want to live there.

Thank you, Katja. Great suggestion. I lack a bit of imagination regarding the granny flat. For cost reasons, it was important that the structure of the granny flat be arranged as it is, basically adjoining the garage and the main building. Also, we all agreed that the "main living" of the granny flat takes place in the living room, and therefore it is nicer to enter the terrace from there, instead of swapping living room and bedroom. I can understand your room divider comment. What alternatives do you have in mind? Any other remarks about the rest?

How high is your budget for the house (purely the house)? 900k?

How high is your budget for the house (house only)? 900k?

I had hoped we would stay under 1.15-1.3 million. However, it seems that the total turnkey construction will be in the range of 1.35-1.4 million. Do you have an opinion on that? The region is Southern Bavaria - Munich surrounding area

I had hoped we would stay under 1.15-1.3. However, it seems like the entire turnkey construction is heading towards 1.35-1.4. Do you have an opinion on that? The region is Southern Bavaria - Munich outskirts

It depends on the total area. For 250 sqm, for example, and the wishes, it would be very realistic.

My question would be, if you are spending that much money, why are you saving on the heating and not using a geothermal heat pump with deep drilling? No ugly outdoor unit and definitely more effective. And what about controlled residential ventilation?