Liability in case of exemption from approval

I don’t have a plan yet, just a draft. But I do ask myself who is liable in case of violations of regulations, that’s legitimate, right? The draft shows a large retaining wall, seems very massive to me, but I could live with that. I can’t judge whether this complies with the development plan or not, that’s why I’m hiring a general contractor.

You have to align your expectations with reality and ask yourself what causes you less effort and costs less money. Again, by signing you as the builder approve the submission planning and confirm that the submission planning complies with the development plan. Ignorance does not protect against punishment. Basically, you have to decide whether you want to take on your role as the builder and act as a 2nd line to save yourself trouble with the building authority, the general contractor, and neighbors afterwards or not. My neighbor to the north built with a big general contractor and acted exactly like you. Afterwards he had trouble with the general contractor because he planned a gas heating system and changing the heating would have cost an upgrade fee. Now here’s the bad part: the development plan states that the building area will not get a gas connection. The end of story… a gas tank had to be buried in the garden for him. Also, the house feels like it’s built too high relative to street level. That now costs the neighbor a lot of money for garden landscaping. You see, it’s up to you whether you want to have such problems or not. Saying “I pay and expect no problems” is extremely naive and in almost all cases that fails.

The client, who is a layperson and relies on the commissioned professionals not to violate the existing development plan, is responsible, and not the professional ??????????????

Yes, you sign, the "professional" plans and implements for you.

I have read the development plan but did not understand everything.

You do have a mouth to ask. After all, it is YOUR house being planned, which you are paying for and where you are supposed to feel comfortable later. Therefore, everything that is permitted should be taken advantage of.

I pay money for that and expect the corresponding implementation.

Yes, you do get the implementation. The building application includes everything that can be quickly compared with the development plan. The maximum height can be seen on average. The building application states in black and white that the floor area is smaller than the floor area ratio, etc.

When I receive a "medical report," I don't have to understand everything the doctor wants to say.

No, but the doctor also covers themselves if an operation is planned: then you also sign papers that you do not understand.

O. k. Zaba12 and ypg. I must have based my assumptions on the wrong premises. I understood that as the client who signs, I am responsible, even if the planner has violated the development plan. What can I do to ensure that the submission plan does not violate the development plan or other rules if I myself am not able to verify this beyond doubt? I could have the plan and the development plan checked by a construction supervisor, but then I would still be responsible, since it is I who signs and not the consulted construction supervisor. A third party would therefore also not be the solution.

O.k. Zaba12 and ypg. I probably assumed the wrong premises. I understood that as the builder who signs, I am responsible, even if the planner violated the development plan. What can I do to make sure that the submission plan does not violate the development plan or other rules, if I myself am not able to verify this beyond doubt? I could give the plan and the development plan to a construction supervisor for review, but then I would also be responsible, since I am the one signing and not the hired construction supervisor. A third party would therefore not be the solution either.

You can’t get out of the box. Since you place the order and it is above all your property. It is virtually being built on your behalf. This applies to the general contractor, not to a property developer. Responsibility cannot be delegated. You can look for a sworn construction expert who reviews the submission planning and gives you more security. Nevertheless, you remain responsible. Perhaps it would be better for you to build with a property developer. That way you are not responsible and you buy a house on a property.

What can I do to be sure that the input plan does not violate the development plan or other rules if I myself am not able to check this beyond doubt?

As said: building permit process (construction has not yet started).

What can I do to make sure that the input plan does not violate the development plan or other rules,

Check, read through, ask if necessary.

if I am not able myself

It is easier to compare the numbers and sketches than to learn the basics. Why shouldn't you be able to? You have also read and signed your contract for work, haven't you?! If you are mature enough to build a house, you will also have to take responsibility. It is like making children and having children :)