Is a 5-meter floor plan width too narrow?

Just use our friend Mr. Googel and search for Reihenhausgrundrisse there. You might find something that suits you. And as I said, the ground floor just has to be bigger.

These are the dimensions of a very narrow terraced house. However, these are usually 2+1-story, but take a look at the floor plans. Of course, a detached house offers more freedom regarding windows and entrance. The critical question will be what the exact regulations for the roof shape are. With a bit of luck, you can also manage two upper floors ("single-story") (attic + loft). Is this about Hamburg? I thought the setback areas there are 2.5 meters or 0.4h.

That is definitely a challenge for the architect.

Depending on the plot, something great can still come out. I would not dismiss the idea per se if everything else is right.

Special requirements can lead to very interesting, individual designs. Even in narrow buildings, zoning is important, which does not necessarily contradict the sometimes required room sequences. However, without careful planning that also pays special attention to the surroundings, it (fortunately) does not work.

Good evening,

The house is detached and I also fear that it would somehow look strange.

No! It requires a creative architect and your willingness to take unconventional paths.

Attached you will find a planned house (unfortunately I am not allowed to show the built original; requirement from our client) as a detached single-family house 5.50 m x 16.50 m as well as a semi-detached house with comparable external dimensions (making use of all the "exceptions" of the development plan).

Everything is possible; I am sure Hanse Haus also has very good architects

Rhine greetings

Just type narrow houses into Google, and you'll find some interesting pictures. I have also looked into it a bit.

The newspaper DAS Haus also has ideas there, google it. And if I remember correctly, I have seen such house examples at a building society as well.