ᐅ Build a Duplex or Two Single-Family Homes on One Lot?

Created on: 12 Aug 2017 17:02
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Rob1107
Hello dear forum,

We are currently planning the development of the plot of land attached. The previous owner’s initial plan was to build a duplex (see preliminary building inquiry in the attachment). As the new owners, we are now wondering if there might be enough space on the property to build two single-family houses while complying with the boundary building regulations. The plan is to divide the plot in half and possibly build two single-family houses. However, this could be quite challenging due to the building boundary limits.

Are there any exceptions regarding boundary construction if an agreement on a reduced distance is reached with the future neighbor? Or is it generally not allowed to reduce the distance because of fire safety regulations and similar requirements? I have attached the relevant zoning plan provisions (upper information, MI).

Thanks in advance.

Best regards

Architektur-Grundriss eines Baugrundstücks mit Bebauungslinie, Wohnhaus und Parkplätzen


Technischer Bauplan mit Rohbau- und Fundamentkonturen, Messwerte und Linien
RobsonMKK12 Aug 2017 19:08
A semi-detached house is also a single-family home [emoji6]
11ant12 Aug 2017 19:24
Rob1107 schrieb:
Are you sure about that? Do you possibly have a legal basis for that in Baden-Württemberg?

For such matters, @Escroda is much more knowledgeable, but I don’t see anything speaking against it. Semi-detached houses exist in Baden-Württemberg as well, typically with separate landowners.
Rob1107 schrieb:
Actually, both parties would like to each build a single-family house.

By single-family house, do you mean "detached" in this case?
Rob1107 schrieb:
One party would also like to build with a basement, the other without. If the space doesn’t allow, in the end it will be two semi-detached houses.

If building together or at the same time, having one with and one without a basement is like a house with a partial basement and is unproblematic. With staggered construction, a symbolic house spacing will not be sufficient (if the basement house is built after the no-basement house).

If basement/no-basement is the only difference, I don’t see a problem—just as there wouldn’t be if it’s only about different interior layouts. Different floor heights are a bit more complex for semi-detached houses.
Rob1107 schrieb:
And on what do you base that?

On the plot, as he wrote. The setback areas clearly define the framework, meaning the entire cluster has to fit into the red hatched area—at least as rectangles. They could also form an L or T shape overall, but that does not significantly affect the available total area here.

Two widths of 9 meters (30 feet) each is just right for two nice semi-detached houses. That is less narrow than typical traditional terraced houses.

The beach is not in the Alps, you have to go to the sea for that.
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Rob1107
12 Aug 2017 19:57
="11ant, post: 217650, member: 32750"]Someone like @Escroda here is much more knowledgeable about this, but I don’t see any reason why it wouldn’t be possible. Even in Baden-Württemberg, there are semi-detached houses with separate property owners as usual.

Yes, as already mentioned, it would alternatively be two semi-detached houses.
By single-family house, you probably mean "detached," right?

Exactly, two detached single-family houses.
About the plot, he already wrote about that. The setback areas clearly define the boundaries here, so that the entire building mass must fit within the red hatched area — at least as rectangles. Overall, they could also form an L or T shape, but that won’t change much regarding the available total area.

Two times 9 m (30 feet) wide is just right for two nice semi-detached houses. That is less narrow than typical classic townhouses.

Still, it is worth checking whether there might be space for two single-family houses. In our opinion, two single-family houses are more attractive than one semi-detached building. That is why I started this topic—to ask if it might be possible to reduce the building setback.
RobsonMKK12 Aug 2017 20:43
I believe the appeal of two detached houses is misleading. It’s better to have a well-designed semi-detached house than two poorly executed single houses.
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Rob1107
12 Aug 2017 20:47
RobsonMKK schrieb:
I think the appeal of two detached houses can be deceptive. Better a well-designed semi-detached house than two poorly executed singles.

That may be true, but considering that one party wants to build with a basement, construction might start at different times, possibly with two different contractors, and the party with the basement requires more square meters (square feet) of living space, planning can become quite complicated...
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Nordlys
12 Aug 2017 22:12
Then you have chosen the wrong plot. Selling to a developer who delivers a turnkey home, where each party then selects a suitable single-family house, would be my advice. Before you try to force something onto the land that it can’t support. Karsten