ᐅ Semi-detached house: one unit with a basement and the other without?

Hello everyone,

In our new residential development, semi-detached houses including the land are being offered. We have purchased a plot and now want to sign the contract for a semi-detached house without a basement. All the semi-detached houses were originally planned without basements by the same developer.

Now we have learned that the buyer of the neighboring plot with the other semi-detached house that is also to be built plans to build with a basement after all. We are expected to start construction at roughly the same time.
The big question now is: who has to cover the additional costs? The person ordering the basement should actually be the one to pay, right?

In my opinion, the structural engineering calculations would need to be redone, and stepped foundations must be built under the semi-detached house without a basement, correct?

Have you had similar experiences?

I'm calling in @11ant and getting the popcorn ready.

If all of this is handled by a developer, they have most likely calculated everything accordingly. If the standard is without a basement, the purchase price does not change due to modifications made at the neighboring property.

I would also say that as long as this is carried out simultaneously by the same builder, you already have the best option.

filosof schrieb:

I’m calling @11ant and grabbing the popcorn.

Hopefully, you also have some popcorn bag clips, because this nonsense will be over quickly.

Häuslebauer36 schrieb:

All semi-detached houses were originally planned without basements by the same developer.
Now we’ve learned that the buyer of the neighboring plot with the other new semi-detached house would like to build with a basement after all.

Oh, the neighbor wants that. I want a million, with cream. And for chickens to actually be able to fly seriously.

Unfortunately, you didn’t mention the project, so I can’t check it case by case. I’m always willing to learn, so please provide that information. Strictly speaking, the non-existence of the Wolpertinger is an unproven assumption scientifically, and such a project would be “only” as rare as hitting seven with a bonus number. So I would genuinely like to get to know it if it exists.

Based on my experience, I can rule it out with 99.75% certainty. At most — and even that would be extremely rare — a project might exceptionally offer both “with and without basement” variants, but only entire semi-detached houses of the same type. Regarding basements, dizygotic twins are basically possible and require hardly more effort than building the basement half before the no-basement half; and personally I would usually make the foundation of the no-basement half stepped and deeper than if both were without basements. But that’s just an explanation for readers interested in the fundamental answer. In a developer project, I consider this rare building form extremely unlikely.

It’s possible the developer offers the basement variant in a neighboring construction phase, and the neighbor misunderstood this. Typically, these models all exist in the drawer as basement versions and are adapted to the particular conditions of the building area. And these conditions are usually the same for each “row,” e.g. “no basement due to adjacent water protection area,” “no basement because district heating negates need for a large technical room,” and rarely “with basement because of a sloping site.” When building a basement for a house with the same above-ground footprint, we are not talking about a trivial additional cost like a fifth course or second side mirror. Instead, it’s roughly a 25% surcharge, which significantly changes the pool of interested buyers. This means marketing must address a completely different target group. But as I said, please tell me the specific project.

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11ant schrieb:

fifth corridor

Of course, fifth corridor. I did attend school before Pisa, but the processing time of a maximum of four minutes is sometimes a bit tight at my age.

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