Building an end terraced house - Which technical requirements should be considered?

The development plan for this is not relevant to the question of the TE; at least there are no usual requirements that the appearance; or roof shape and similar must be uniform within a house group.

However, I know development plans where something like that is prescribed.

Maybe the administration missed that in this case; but that should be just fine for the TE.

From my point of view, the municipality really dropped the ball: legally, I actually only see joint applicants obligated to coordinated planning here, but technically it should generally be like that. The application form should have included who you want to build with (equating prefabricated house manufacturers with solid construction developers); and then the plots should have been allocated accordingly so that it fits together. So, for example, a Weberhaus group, a Schwörerhaus group, a Huberbau house group, etc.; and applications for specific plots only if you join the majority within your group of four.

How else is that supposed to work? - the building authority would have to notify the others in each house group when the first applicant’s plan was stamped as received, and declare the first one’s sectional drawing as the standard for the others, or what? - someone clearly didn’t think this through.

A group of four is three times as complex to coordinate as a semi-detached house, and even there I clearly advocate joint planning.

I see no-basement owners, partial-basement owners, sloped roofers, and recessed top-floor owners heavily armed dragging each other before the judge. The mayor won’t need to run again in the next direct election.

Not giving the entire development area to a single developer is commendable – but here, in the details, it probably isn’t well thought out.

From my point of view, the municipality totally dropped the ball:

(…)

Not handing over the entire development area to a single developer is commendable – but here in detail it seems not well thought out.

especially since they determine the number of plants per area including the planting list, but fail to establish, for example, a roof shape & uniform ridge height per sub-area. If it is supposed to be colorful, okay, then each sub-area could have been designed differently, but like this... what kind of chaos is this supposed to become?

How else is that supposed to work? - the building authority would have to notify the others in each housing group as soon as the first applicant’s plan has been stamped received, and declare the first person’s sectional drawing as the scale for the others or what? - someone wasn’t thinking straight.

It doesn’t have to. A RH beam doesn’t have to look the same.

And technically that’s not a problem either

And technically that's not a problem either

When the neighbor coming from the basement arrives later, it's always a complication.

A RH beam doesn't have to look the same right away.

Of course, everyone can comply with the development plan differently than their neighbor. But then the row looks like crooked teeth as an ensemble, and the fact that the "seam lines" of the shared house sides wildly intersect along the height line is also not a dream of some component sealing for their numb feet. Consideration—both for the neighbor and for the viewer of the houses—is not a weakness of individuality. Make Love, Not War—garden fences into plowshares

It is stated in the development plan:

In WA1 and WA3, the following roof types are permitted:
- Gable roofs, tent and hipped roofs: up to a maximum roof pitch of 40°.
- Shed roofs: up to a maximum roof pitch of 15°.
- Flat roofs: up to a maximum roof pitch of 10°.

In practice, however, it is advisable to build the group of three with the same roof type.
Technically, different types are possible, but this is certainly not desired. However, the development plan does allow it for now.

Well, I will NOT look into the development plan. You can gladly copy the facts in here.
However, I see things getting difficult for the houses if each person has their detached house or semi-detached house designed by an architect individually. Then a two-story building with a hipped roof as a semi-detached house will be planned next to a gable roof variant with a different ridge height... Not to forget the facade design - one might have a modern cuboid with a shed roof, the other sash windows/country house style.