Floor plans of a single-family house with a granny flat, please tips and feedback

Hello 11ant. My pictures already show the existing old property that extends over the [U]entire plot, which is to be divided. The old property is only to be demolished and rebuilt in such a way that 2 separate houses are created, as with many neighbors, with a shared central part. This is also provided for by the development plan. The neighboring house opposite, to which an extension is to be attached, has no windows on the southwest side for this reason, since it was already clear that an extension would be built eventually. In addition, there is a fire protection wall between the two existing houses (opposite each other) that is to remain. It would be a waste not to use this wall for a room/extension.[/U] Distance from the boundary does not help much if a house stands 3m further away. Besides, the space in the middle is explicitly desired. Since the immediate neighbor will/wants to extend there as well, as can be seen in the previous picture (blue frame). If he does so, there will be 0m boundary distance, but rather a continuous building substance with 2 houses.

It is really difficult to recognize this from your jumble. This text addition should have belonged at least in the description if you either cannot or do not want to represent it in planning terms. The plan reader cannot read your thoughts.

Finally, finally some suggestions :) I gladly accept the last 3 posts! I had already given up on anything constructive coming out of here!
A little something general about the plot/basement. Yes, the plot is tiny, that's known, but there's no more! And in this area, €400,000 is paid for the 320 sqm (no joke). Supply and demand here is like heaven and hell. Our city is also called that. The 2nd Munich because everyone is looking for something but there is nothing. We want a basement because the plot is tiny and you thus have more space and flexibility (rental, lots of depreciation (interest and garden), office, kids, etc.). The basement should be a residential basement according to the state building code so that afterward no one can complain if there are too few windows or the room height, as with many others, is not correct. I have gathered a lot of experience from landlords there. Likewise, the basement will have its own central ventilation system (smaller unit) so that it can individually control the air volume from the ground floor/upper floor/attic itself. The costs for the basement are of course high, about €130,000 but not €200,000, for added value and also corresponding appreciation upon sale. We actually didn’t want any discussion here since we want a basement, no matter how it will be used later. You can look at how to change the light wells or use the corner room in the basement without a light well. What do you think here, does anyone have an idea? The other windows then just have to be large enough. I think about 1/3 of window area is required for a residential basement, but I’m not sure anymore.

About the association and basement rental: The association has its rooms right next door and could stay there as well.
But since we want to rent out the granny flat, it would of course be best to use the granny flat professionally ourselves as if renting it out 365 days, 24/7 to strangers.
We need the space in the basement, except the technical room and a small storage room, not really.

About my intended flexibility: In my environment, grandparents really have problems with their houses. Either it’s too big. Bad possibility to accommodate care or the sometimes large houses are planned in such a way that you cannot later create a separate living unit. I’m aware that I won’t succeed with my "jack of all trades" idea. But I was already thinking of the separate granny flat and at least the upper floor that one can later also use as a living unit, hence also the kitchen connections. The connections that can be branched off from the bathroom cost only a small part more in planning. Afterwards, you can forget about that in a solid house or it costs at least €20,000. Primarily, we want a nice home with a granny flat in the basement without compromises. But we also want to plan so that, for example, the living unit in the upper floor would be possible later with little effort and not with great effort. All my grandparents were accommodated in a care bed on the ground floor until their death because they did not want to go to a home. It worked, but it was not very great for the caregiver. Here, for example, the granny flat with an internal breakthrough could provide relief.

The office or the room in the living room was thought to be functional. It could be a dressing room or a guest room for visitors, an office room, a junk room, whatever. If we only have 3 living rooms upstairs for four people, then an extra room downstairs is worth gold.
I admit the supposed misplanning upstairs. It’s just a pity because a lot of time went into it. Also, we playfully placed the furniture/kitchen as we thought. Of course, that can still be adjusted. The thing with the sofa is nonsense too. At the beginning, we just had the big room in SweetHome3D and couldn’t imagine it, so the furniture.

We want to build for this now but plan for contingencies, I won’t let that take away from me. The minimal effort for kitchen connections upstairs or a hidden door opening to the basement doesn’t cost the world. Also at least 1-2 M25 empty conduits from every room to the technical room. Who knows what technology will bring in 30 years.
I added a railing to the entrance of the granny flat, that had of course been missing.
House entrance plinth was play. You just have to see how high the elevation is and then do something reasonable.

Assuming the floor plan can be built like this. How could I create 3-4 equally sized rooms with this L-section? The problem here is the gable.

Thanks first for the advice. We will implement many things and hope that more and more good things come out of it.

Your ground floor is not suitable for care.

Why should the living space in the basement cost less per square meter than above ground?

What you write can also make sense. However, the floor plan is not suitable for that. If you or your wife need care, it can be assumed that the two children's rooms are no longer occupied. So there would be space. It seems to me that you prioritize the granny flat or the care possibility more than a house where you feel comfortable with the family. And that for 700,000,- (although to be honest I somewhat doubt that if the price per square meter is so high in your area).

Assuming the floor plan can be built like this. How could I create 3-4 equally sized rooms with this L-section? The problem here is the gable.

Thanks in advance for the advice. We will implement many things and hope that more and more something good comes out of it.

Of course you can build the floor plan like this, but you really shouldn't. You waste the money and are never truly happy with the result.

The first idea to mirror the neighbor's floor plan is at least unsuitable for your requirements.

I would move the gable about 2 m further towards the street, then divide it in the middle and relocate the granny flat/office on the southeast side on the ground floor. Only partially basement to compensate for the additional costs.

Terrace facing south/west.

The basement costs more than building above ground.

,
Of course you can build the floor plan like that, but you really shouldn’t. You’ll waste your money and never be truly happy with the result.

The first idea of mirroring the neighbor’s floor plan is at least unsuitable for your requirements.

I would move the gable about 2 m further towards the street, then split it in the middle and relocate the granny flat/office on the ground floor to the southeast side. Only partially basement it to offset the additional costs.

Terrace facing south/west.

The basement living area costs more than building above ground.

But the house must be mirrored, at least the overall width, roof pitch, eaves height. Optionally, you can build lengthwise or widthwise up to the property boundary on the left.
Of course I can build the house deeper, but then I’d soon be on the street and have no garden at all.
Do you mean something like in the diagram?
Here the driveway/entrance would also have to be taken into account, which would mess everything up again. In addition, the sun, as known, comes from the south.