Interpretation of the 1957 development plan <-> possibilities for new construction

Observe the building line of the garage?

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I don't read anything there, is the development plan from 1957 (?)

Correct.

Observe the building line of the garage?

The house has one too.
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11ant, thank you very much for the hint. So you mean, if the existing house subsides, the ground should be checked to determine the properties for a new build. If the ground is good enough, a renovation would also not be out of the question.

Again regarding the garage issue. I was aware that I can split the 9m. I was thinking of a "normal double garage," about 6x7m or so. But with the remaining 2-3m, I can't do anything for a workshop shed. To not exceed the maximum 9m, I would place the shed 3m away from the north boundary. Actually directly attached to the house,... which would probably violate the setback area of the house.... ... or could the shed be part of the house, then the original question arises again whether I am allowed to approach 3m to the boundary behind the garage and only have to meet the 6m in front of the garage.

Regarding the plan: The year 1957 is stated in the Geo-Portal where I downloaded the plan. The employee from the municipality said he also does not have anything else available. I would have to look up the construction year of the house from the documents, but I think 196x is a good estimate.

Our wish would be whether the garage could be placed in FRONT of the house.

I imagined it like this. Red = Garage Blue = House Green = Shed

No, that is not possible. Garage and house must be within the building plot. And if the legend says that red is a building line, then it is mandatory. The shed goes to the back.

Why am I not allowed to build living rooms there then.

Fire protection regulation. I am asking cautiously from the side whether the ridge direction is also specified?

I don’t understand that. The house (blue) must be on the building line to the street -> check. The garage (red) must be on the building line to the northern property boundary -> check. Where the garage is placed in the east-west direction is not specified in the development plan. It must be within the building envelope. But the building envelope is not defined at that point in the plan. Only that it must be "behind the building line of the house." How far is not specified... (I suspect "visually significantly set back). -> check ??? If I were to build an L-shaped house and the shed "was part of the house," then a living room would be possible. As long as I stay 3m away from all property boundaries. And comply with the 6m of the building envelope in front of the garage. Hence the original question. The building envelope is L-shaped and only the garage requires the building line to the northern property boundary. The ridge direction is specified (north-south) and was implemented that way in the existing building. However, in the neighboring environment everything exists. Tent roof. Gable roof.... I believe that as long as you don’t build a flat-roof Bauhaus cube, the municipality will accept it. Diagonally opposite, four urban villas with tent roofs were newly built, although the development plan at that time also specified gable ridge directions.

The building envelope is not defined at that point on the plan.

??? As long as you haven't scribbled on the partially posted development plan, the blue line here should represent the building envelope. Unfortunately, the legend for the plan is missing – check if you have that as well.

I think as long as you don't build a flat-roofed Bauhaus cube, the municipality will agree. Diagonally opposite, four new urban villas with tent roofs were built, although the development plan at the time also prescribed gable roof orientations.

The saying "Belief is for churches" applies here. I think you will get a definite answer with a building inquiry or, briefly, a phone call to the building authority about whether they loosen requirements in old development plans and adapt them to the current houses.