Build an extremely narrow house with a width of 4.5 meters due to setback areas

I currently have a plot reserved on which one could build a maximum of 4.5m wide but up to 14m long.

A bit more info about the plot (including the neighborhood) would be necessary. Also who wants to move in later: a couple or a family. In my opinion, such a project is not suitable for the latter. Couples can turn it into a dream house if they commit themselves and adapt to the house format. There was recently strong criticism of this statement from an architect.

Are there house providers that build such narrow houses? A single build as an architect-designed house would probably be very expensive.

Few. However, it will be an architect project in any case, but it does not have to be more expensive, since the load-bearing walls are only the exterior walls, etc. Usually such a house is a symbiosis of living and garden so that one does not feel trapped.

due to the unfavorable format rather even less.

Or seemingly more, because the corridors are eliminated. House examples: Flying Spaces v Schwörerhaus, mobile homes and/or floating homes. Also, the spatial arrangement of extraordinary motorhomes can (or rather must) inspire.

Take a look at some pictures of the Seven Swans in Frankfurt. Then you'll get a feel for such a house - with the use in Frankfurt absolutely amazing, but not as a residential building.

Well, there is a huge difference between 4.2m internal dimension and 4.5m external dimension. Our living room is 4m wide and I find it almost too narrow...

It basically comes down to a shotgun house, so almost no hallway, you go from room to room. Unthinkable for a family with children.

We have been renting a similar house for about four years: [...] Interior dimensions approx. 4.20x14m.

And now the crucial question: where could half a meter of width still be taken away?

The crucial question is rather why one builds new when one already lives in such a great narrow house for rent, or why one doesn’t make the new building just as nicely narrow if one likes it so much.

The crucial question is rather why one builds new when one already lives in such a great narrow house for rent or why one doesn’t also make the new building so nicely narrow if one likes it so much.

You have already gotten the answer!

The question is whether one is willing to make such compromises when putting 500k on the table for a new build on a plot... After years, we decided that we don’t want that and are now building new.

==> nice cozy house, but many many compromises. And maybe the family is also currently growing or a growth is planned? Because

It might work with one child, but with more the dimensions hardly offer options,

that sounds like family planning.