Floor plan design for a single-family house with a granny flat

"Housing units are rooms located in a self-contained context and intended for permanent residential purposes in residential buildings, which enable the running of a household (own lockable access, room, supply connections for kitchen/kitchenette and bath/WC)." Nothing more and nothing less.

That’s exactly the point – there is no separate lockable access. The access is shared with the "other housing unit" through the main door. It would be different if there was a common hallway from which two apartment doors lead – one for the main housing unit, one for the second. I have discussed this topic with several general contractors, energy consultants, and architects. Believe me, you are not smarter than the rest of the world...

@Costruttrice: The guest WC already has a shower, as shown in the plan.

I have already seen that a shower is planned in the ground floor bathroom. I just hadn’t considered this bathroom in your plan as the guest WC for the main apartment, because it is planned there as the bathroom for the granny flat. But with your reasoning

that the granny flat was built in accordance with KfW compliance.

it becomes clear that it’s only a granny flat pro forma because of the subsidy, and this bathroom will quite well serve as a guest WC and the granny flat will probably be used as a guest room for the few overnight guests during the year. For those few times it is even slightly larger than your children’s rooms, which are occupied year-round. But the children don’t need a ballroom; the parents generate one for guests, but it is supposed to raise capital after all. That’s exactly my kind of humor. An office accessible through the bedroom you like just as much, as well as everything else. Then go for it, it has to become your dream house, not the forum user’s.

I can only agree with my predecessors. The granny flat will not work like this. Keyword: subsidy fraud.

Is this the planning of an independent architect or a house provider?

Without having read all the comments - the following points would bother me at first glance:

- No consideration of the terrain / connection to the outdoor area
- Utility room not practically usable
- Bedroom almost as large as the two children's rooms combined
- Office as a walk-through room
- Bathtub in the swing area of the door
- Little storage space in the kitchen. (The kitchen may look good visually but will not work well in everyday life if you want to cook frequently)

To me, it seems like an amateur planning. Please press the RESET button, find a new planner, and be open to new ideas. The plot seems to have potential.

Best regards

Your plan is quite nice, but it doesn’t work for several reasons: the west side is the only side where houses stand, so it’s unsuitable for a terrace. To the north there is open field, to the south/east an unobstructed view into the wide valley. The street in front (your planned driveway) is a dead end and we are the last house; after that it turns into a dirt road. Accordingly, the orientation of our house is already perfected (see above). Also, in my opinion, your planned driveway is far too sharp-angled; I wouldn’t want to always drive or maneuver the car in there. As I said, well-intentioned, but unfortunately not suitable for our property. (We initially even brainstormed that way with our architect, but then reasonably discarded it for the reasons mentioned.) Thanks anyway!

My plan is not only nice but well thought out. Due to lack of necessary information only partially perfect. But in any case better than the one you proposed. Where is your terrace? How do you want to shape the terrain? Are you allowed to fill the terrain that extremely? Or do you want an elevated terrace? All questions that remain unanswered.

One day you will be glad to get some shade from the west. Especially since you can also orient the terrace completely to the south. You neither show the surroundings nor have you said what is important to you.

Show an aerial photo and photos of the surroundings.

What does the municipal ordinance, the development plan, or if in doubt the state building code say about the parking spaces? You don’t respond to inquiries. I would never plan such a long steep driveway, and then still in the southwest?

Where are the parking spaces for the second residential unit supposed to go?

Are you sure that nothing will ever be built to the north? Why not orient the house to the north then? If that is so important to you.

You planned a house and then placed it somewhere. That makes no sense to me. On a slope you plan together with the terrain shape. For example, I positioned the house "Tieger" so that extremely large fillings aren’t required.

Provide all the necessary information, then I’ll reconsider a perfection.

I don’t see a complete second residential unit in your plan. That is easy to fix, but it’s not present in your plan.

Hello, as promised I am getting back to you regarding your statements. Since the topic of a granny flat has caused the most discussion among some here, I would like to address this first. I had written that the granny flat was created with regard to KfW compliance. The credit information sheet states: "Residential units are rooms located in a self-contained context and intended for permanent residential purposes in residential buildings, which enable running a household (own lockable access, rooms, utility connections for kitchen/kitchenette and bathroom/WC)." Nothing more and nothing less. I do not find anything there regarding DIN standards, minimum sizes or rental obligations etc. It may be that some people have mixed up a few things. With the LaBo the whole thing looks different again, for example, but we are not planning with that.

The KfW only promotes what is compliant with the state building regulations. Since the KfW knows that the building regulations are a state matter, they save themselves a more detailed definition or listing according to the respective state building regulations in the description.

The information from a "Merkblatt" is just that - initial information. Before the funding from KfW is paid out, the apartment must be approved as such within the framework of the building application. This means it must meet all requirements regarding fire protection, sound insulation, and parking space regulations. These are additional costs that usually exceed the subsidy amount. However, a good architect should be aware of this. A contractor may provide less customer-oriented advice in this regard.