Unequal width in the planned semi-detached house

It would be at least sporty to still want to overtake the neighboring half now, just so you as co-basement dwellers could be the first builders (which would, however, be highly advisable). However, according to a rough estimate, about 146 sqm can be created, which relaxes the need for storage space. Then you partially put the technical room in the roof, so it will work without the basement becoming the killer criterion.

Now my question to the forum: would you build such an asymmetrical semi-detached house? [...] Maybe someone has experience or tips for a rather unconventional semi-detached house!

Profile-aligned at the "bonding edge" is the key trick to defuse the bomb. Asymmetry then only concerns the width and is completely unproblematic. You don't need a downright "unconventional" semi-detached house, but we also have an example for that here:

as early as 2018 @MadameP or discussed an asymmetrical (corner) semi-detached house;

Thanks in advance for all the super helpful answers. Do you have any figures in mind for what a later start of construction for our house with a basement would mean in terms of additional costs? For us and possibly also for the neighbors?
I have attached the site plan with property dimensions here. The one on the left would be ours. Including garage (6m) or carport (5m), there would still be 8 or 9 meters of width remaining.

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Do you actually want to build with Danwood? It would at least save the construction crane. You can also share the construction site toilet and electricity/water. One installation appointment... the savings can add up.

Then you partially put the technical room into the roof, so it works even without the basement becoming the killer criterion.

With Danwood, probably a no-go like with so many budget builders. I don't consider Danwood flexible either. Apart from that - the hip roof of the 116w is probably just barely about 2 / 2.20 meters high at 22 (not 25) degrees. Try sending a craftsman up there; he will think you’re crazy if he has to move around there.

Do you have any figures in mind about what a later start for our house with basement would mean in extra costs?

I think time won’t play such a big role. The houses will be built, possibly in a year. I don’t know exactly. But certainly enough time to conjure up a basement between the building permit and the installation date.

If you and the neighbors build without a basement, then hurry up and be the first. Otherwise, it will be complicated and expensive!

How is that supposed to work if the semi-detached house partners already have the building permit and the questioner doesn't even know what he actually wants?

Rushing to slap something together just to be the first to build. That can only go wrong.

What does the development plan say about the design of the semi-detached house? Are there any specifications? If not, the size of the neighbor’s house does not initially matter. One could even rotate the roof to deliberately differentiate. Visually, it might even be more pleasing if you want and are allowed to build higher.

How is that supposed to work when the semi-detached house partners already have the building permit and the questioner doesn’t even know what he actually wants? Rushing to slap something together just to be the first to build. That can only go wrong.

Danwood has lead times of 1 to 1.5 years. In that time, with a good general contractor, you can finish the house including the basement.