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

I have to ask again, you paid the equivalent of €667/sqm for the plot, or is there a typo?

What is the deal with the 3m noise barrier at the rear boundary?

Unfortunately, there is very, very little to be found here on the topic of chain houses, let alone floor plans or examples.

We are still fumbling in the fog a bit, trying to figure out how the whole thing might look afterward

Basically, a mid-terrace house is being planned here.
The floor area ratio would also be interesting... sometimes you are actually allowed more than on the ground floor, for example a carport extension.
By chain terrace house I understand houses that are built next to each other in such a way that courtyards are created. Unfortunately, the garage, which would provide the separation to the neighbor, may only be built up to the boundary. Or?
The development plan would be interesting. And then an experienced architect!

I have to ask again, you paid the equivalent of €667/sqm for the plot, or is there a typo? What’s the story with the 3m noise protection wall at the rear boundary?

We haven’t paid anything yet, precisely because I want to estimate the total costs of the project first before buying the plot. It’s clear this is not ideal, but the market for plots here in the region is practically non-existent. Either there is nothing available, it’s sold after just a few days, or it’s unaffordable. We always wanted >350sqm plot area, detached house, but that’s currently unrealistic here.

So now there is somehow the "pressure" to make the best out of a non-ideal plot, rather than searching for years and having prices rise even more in the meantime. Stupid situation right now. :-( The €160k for 240sqm is correct, unfortunately no typo.

The 3m noise protection wall borders the plot at the rear to the village main road, but we don’t really mind that.

Regarding the floor area ratio, the development plan doesn’t say anything in my opinion, only "site coverage ratio 0.4; FH max. 9.5m; TH max. 6.0m; SD 35°-40°". Concerning garage/carport the development plan states "In WA1 the allowable building height of garages and carports is limited to a maximum of 414.00 m above sea level. Roof terraces are permitted on all boundary garages / carports". Since 0 = 410m, a height of 4m would be possible.

That gives the mathematician the creeps.
My suggestion:
Floor plan I (Max): 240m² * 0.4 = 96m²
Floor plan II (Max): 96m² * 1.5 = 144m²
For a house of 9m * 10m, there are therefore still 6m² left for the terrace and then another 48m² for the garage/parking space and driveway.

Actually, I meant it that way too, so thank you very much for the precise derivation - I wasn’t even clear on the exact calculation logic yet. Thanks, you learn something new here every day.

We have an appointment with the city on Thursday. I will critically address the issue of the boundary/neighbour’s garage/basement there, as well as with the potential builders.

The larger quantities in the negotiation and the freer execution planning are automatically reflected in the price. Whether a developer necessarily has to take this on is another question,

Quantity discounts are marginal for a row of three houses and do not yet exist for a semi-detached house. A common planner "only" saves complications because the possibly unequal twins (semi-detached houses are typically left/right, rows of three are typically left/left/right or left/right/right, and terraced houses are typically laid out uniformly aligned) hatched in the same brain fit safely together at the interface (and because it can be better coordinated if one wants to build with a basement and the other without). With a mirror clone or identical clone, a fee saving of 5% is possible - maximum.

Now we have another question, the neighbor's garage (which would directly border our house/basement) is unfortunately causing us quite a headache by now.

It is clear that it is not ideal and it would have been much more sensible to build it "from a single source." But should we rather abandon the whole project because of that? Is this more something that just makes it more expensive due to additional safety measures (5k? 10k? 20k? 50k?), or could the entire project fail later because of it? Or would you rather forego the basement? Although with the small plot size, a basement is really a basic requirement for us...

Unfortunately, the garage, which would form the separation to the neighbor, may only be built up to the boundary. Right?

: What do you mean by that? Of course only up to the boundary, I can’t build on the neighbor’s property. Or which boundary do you mean?