Terraced house on a 240 sqm plot - fundamental questions / feasible?

I have been reading the forum for a while now, but this is my first post. After several years of searching in the Stuttgart metropolitan area, we now have the opportunity to buy a relatively small plot of land on the edge of a new development area on short notice.

Plot: 12m x 20m = 240sqm; floor area ratio 0.4; FH max. 9.5m; TH max. 6.0m; SD 35°-40°; 160,000 EUR

The whole thing could be built with a row house, for illustration I have attached the site plan.

To be able to roughly estimate the project, we have a few basic questions, many thanks in advance, that would be a great help to us!

1. Our budget is 560k, is that realistic for a 135sqm house? Roughly estimated: 170k plot, 50k basement, 300k solid house from the developer (2,200 x 135sqm), 40k ancillary construction costs. Is that rather generously or rather tightly calculated? (Buffer is still available)

2. Does it make a big price difference whether we build 1.5 or 2.5 stories?

3. Is a 9x10m house + garage/parking space of 30sqm feasible with the floor area ratio? As far as I have read, for ancillary facilities the floor area ratio may be exceeded by 50%. 90sqm house < 0.4 x 240 + 30sqm < 0.5 x 0.4 x 240

Is there anything fundamental to keep in mind cost-wise with row houses that we have not considered?

Thank you very much in advance!

It is tightly calculated, I would plan about 50,000 more for the house. Then another 50,000 for the garden, kitchen, and furnishings. So about 100,000 are missing.

We are currently also building a row house with similar specifications (plot 14m wide, SD 30-35°, intermediate building min. 5m). There are a few points we didn’t know beforehand regarding the row house construction method, even if some are not difficult to understand.
- The ridge direction is reversed compared to the "standard" houses from general contractors/developers.
- On the ground floor, you have a dark wall analogous to a semi-detached house; if you plan a garage, even two.
- On the upper floor, you need to check everywhere windows are allowed. Two full floors make this much easier.
- If the neighbor plans a garage at your boundary, you must coordinate your basement construction with them; otherwise, it will become more difficult/more expensive.

Regarding 1.: I think the budget could work with 135sqm.
But don’t be lulled by offer prices from general contractors/developers. Regardless of the layouts that come up, no one has been able to transparently show us an adjustment to the framework conditions.
Furthermore, as bookstar wrote, kitchen/outdoor area/intermediate building (which is mandatory) are missing.

Regarding 2.: Yes, it makes sense because of the height. In your case, this could be easier due to the more difficult lighting possibilities on the upper floor, possibly with a "smaller" surcharge.

Regarding 3. I can’t say anything because our architect handled/calculated it. The only thing is you should check if the intermediate building at your place may be 3m wide to reach 9m house width.

Not to sound too negative. We are glad we decided on this. Even though the selection process for a building partner took longer and we ended up with an architect. In hindsight, or so far, that has been a very good decision.

Great, thank you very much for your answers already, really great here

: I'm glad you don't regret the decision. Unfortunately, there is very, very little to be found here on the topic of terraced houses, let alone floor plans or examples.

May I ask if you could show your floor plan or the planned house view? Also happy to receive it via private message. We're still fumbling around in the dark a bit as to how the whole thing might look afterwards

"You should just check whether the connector building may be 3m wide with you to reach a 9m house width." -> What do you mean by "connector building"? The idea was actually 3m garage + 9m house = 12m plot width. I quickly sketched that and attached it.

The neighboring plot is already developed and the garage directly borders our plot. To what extent is this now a problem if we want to have a basement under our house?

P.S. The sketch is of course neither to scale nor 100% accurate

The neighboring property is already developed and the garage borders directly on our property. In what way is this now a problem if we want to have a basement under our house?

Because you are digging a big hole right next to the foundation of the garage.

Because you dig a big hole right next to the garage foundation.

Yes, that is clear to me. Does that mean extra support/securing = more expensive? Or does that practically rule out a basement?