Semi-detached house in building area 8.5m x 15m (WxD)

Good evening,
wow. Really impressive how much feedback there already is. Thank you very much!

that the „base“ of max. 60cm is to be understood in the development plan. Laymanly, I would assume that one floor (the ground floor? The lowest residential floor? The lowest full floor) may start max. 60 cm above street level.

You seem to interpret the base correctly to me.

Which of the three interpretations then?

If you want to place a whole semi-detached house on only one of the four building plots of the building window, I do not see this as achievable. After all, I do not at least read from the excerpt of the development plan that it is forbidden to place the ensemble with the gable facing the street.

The majority of the houses on the street have the gable facing the street. The ridge direction is not specified.

Functioning semi-detached house (see with the "usual suspects", Büdenbender does not count among them)

Hm, is that a hidden message that one should keep Büdenbender at a distance? Or do you mean that the house I specifically named does not work?

Where should / may the parking spaces go?

The other houses on the street each have (if there are two residential units there) a single garage in each building bay and a parking space in front. This seems to be derived from the NRW parking regulation. This requires for buildings of building class 2 namely 1 parking space / dwelling, whereby a parking space in front of a garage counts. So there would be 4 parking spaces. For multi-family houses, these no longer count, which is expressed by the fact that the multi-family houses in the street use the basement on the entire width for garages.

Placed lengthwise means that for the 2nd house the basement is completely in the slope and in the front house the basement is a fully usable floor.

Yes, that’s true. What does that actually mean for full storey status? Is each semi-detached house assessed individually in the case of an ideal division of the property?

... and maybe a slightly better scan so that you can recognize the contour lines?

That is the official scan from the city administration. You can’t zoom in any further either. Contour lines are not included there anyway, I got those from the TIM. As said: Across the entire building window 2.2m and rising from the street to the garden.

Hm, is there nothing else?

What you have marked now is the entire property? Is the assumption of correct

14.5 meters wide, so about 34 meters long

Are you aware that

53 sqm per unit

of interior floor space per floor is available. This is reduced by walls, stairs, etc.

In our area, there is a very narrow plot that was built on like this:
at the top (north) the street with parking spaces, then the entrances to the east, the gardens to the west. They are pretty houses. The entrances are in the bay window, allowed by the state building code, on the west side two dormers each for two bedrooms. The plot is flat

Very interesting! Could you send me the address via PM so I can have a look at it in Streetview?

Luckily, you can calculate something with the few parameters. 500 sqm, 8.5 m + 2x3 (distance) is 14.5 meters width, so approx. 34 meters length. Building window definitely 8.5 x 15.. 127.5 sqm can be built over. That is about 109 sqm of living area with an external wall thickness of 40 cm, so including partition walls 53 sqm of usable living space per unit. (That’s basically our open-plan room)

53 sqm of usable living space is not a no-go for me now. We’ve also looked at terraced houses with even less. And there are also floor plans of houses with similar outer dimensions. Although not as a semi-detached house, but so-called "city villas" for an 8 x 8 m building plot can be found. Of course, they have windows on all sides and can only serve roughly as inspiration.

Three meters each on the left and right (driveway/access and garden). Question 1: where do you want to park?

I explained that above in the previous post. We can exceed the parking space ordinance requirement by 100%. But we don’t even have a car anyway (whether that stays that way forever is another topic). When our first child was born, we thought we needed one, but somehow it wasn’t necessary after all. With the second child, we really needed one – then the 49€ ticket came into the way and increased the cost gap between public transport and a car so much that we didn’t take the car after all for the ridiculous 2000 km/year.

Question 2: ideal plot division, who gets the back half, which is practically the luxury version despite the slope, because the front half is basically crap (house plus three meters all around, although with certainty in these three meters no terrace is possible).

What does the wording in the development plan mean: "Covered terraces are permitted up to 1.5 m outside the building boundary"?

Whoever pays more gets the back.
That way you quickly theoretically have a floor area ratio of 1.2

Wait. But that applies per plot and not per semi-detached house on it, right?

So: 3D is not necessary at all. Some calculation is enough. I would leave it as a semi-detached house, one way or the other... you won’t be happy with it.

I’ve been reading your posts for years and always had the impression that you can somehow make everything fit. Would you have an idea for our task?

Is what you have marked now the entire property? Is @ypg's assumption correct?

I have drawn in the building envelope. The measurements calculated by ypg are all correct.

I have drawn in the building envelope. The measurements calculated by ypg are all correct.

Phew, well estimated and calculated despite the time.

I have been reading your posts for years and always had the impression that you can somehow make everything fit. Would you have an idea for our task?

Thank you. Yes, that's true. Before leaving things as they are, I try to find possibilities. Thanks for the flattering attention.

What does the wording in the development plan "Covered terraces are permitted up to 1.5m outside the building boundary" mean?

After the 15 meter building envelope, you are still allowed a 1.5 meter covered terrace, not 180 cm or more. This means conversely that an uncovered terrace can also extend deeper.
In your case, it would be for the rear plot at a higher level, i.e. on the upper floor.

The other houses on the streets each have (if there are two residential units) a single garage in each building bay and one parking space in front of it. This seems to be derived from the NRW parking regulation. This requires 1 parking space per apartment for buildings of class 2, whereby a parking space in front of a garage counts. So there would be 4 parking spaces. For multi-family houses these no longer count, which is evident from the fact that the multi-family house in the street uses the basement level with garages across the entire width.

There is a contradiction. Please, this applies to every builder! Whether wanted or mid-way through: draw this for yourselves. Try to understand a meter. Try to understand the plot. Draw with standard dimensions what is even possible there.
You cannot expect two families to block each other with their cars and that this should work. And where should four parking spaces be? You cannot just line up four parking spaces one after another. Plus the slope. Again: beyond the building boundary is the end!
However, you were also asked to show the plot. This is unknown to us. Therefore, no exact statements can be made.

Very interesting! Could you send me the address by PM so that I can look at it in Streetview?

No, of course not, since you have never been active and thus do not have enough posts.
Here is the SV image:

Which of the three interpretations then? :-)

The top edge of the finished floor on the ground floor.

Hm, is that a hidden message that Büdenbender should be kept at a distance? Or do you mean that specifically the house I named does not work?

You can find the "usual suspects" of developers of semi-detached house projects mentioned and listed in numerous of my posts. Their standard models resemble each other like the GDB mineral water bottle. Büdenbender is not among them, nor other timber frame panel builders, and your example model also deviates significantly from this building pattern (starting with the floor plan of each half being closer to a square, I had already told you the typical dimensions of the "üV" models).