Extension of garage & workshop - tips?

Yes, I understand that, but the previous questions were independent of each other. Road law/right of way, financing in general, garage/shed, home automation basics. They are not yet connected, but each one should provide basics for the purchase decision or help to realistically confront them early on.

I don't find it bad that you ask several questions, but the connection is given. For example, how high is the budget? Can you finance the purchase of such a large plot + outbuildings in the desired region? Where would that be? I would focus on plots with a basement in your place. Building 3 buildings, I think, is only possible off the beaten path (so for example Mecklenburg or I also have a bargain at the Czech border).

Hello everyone, another problem with having a basement is that part of the potential plots are located in the floodplain. Others are far from it. Therefore, it is impossible to say this exactly in advance. I would much, much prefer a basement, but you don’t have the luxury of choice. Since the selection is small and so varied, we want to be prepared for each option or know what we definitely have to exclude. As an example: If a basement is prohibited or not advisable (e.g. flooding) but the plot is large and cheap in terms of price per square meter, then it would be an option. But if it is too narrow or too short to plan a workshop/garage, then it would be out. There are various variables that cannot yet be estimated and that will each influence the next step. That’s exactly why I don’t have an overarching thread. Because easements, for example, apply to only very few plots. But if I don’t roughly know beforehand what it means for me as a buyer, then I risk buying a mess or later having problems with the neighbors. For me, planning already begins before I have a plot in sight, because the market demands decisions practically overnight.

They are not yet connected, but each is supposed to provide fundamentals for the purchasing decision or help to realistically confront oneself with it early on.

The common denominator is you, and unless you have a split personality or are planning multiple houses, the same construction project is the goal of the questions.

But if I don’t roughly know beforehand what it means for me as a buyer, then I risk buying junk or later having problems with the neighbors. For me, planning starts even before I have a property in sight, because the market then demands decisions almost overnight.

Free yourself from the delusion that it is possible to train yourself to be a universal scholar for all conceivable building situations and to be savvy with every property from the start. The stem-cell-like omnipotent building plan does not exist. As you yourself say,

There are various variables that cannot yet be assessed and that each influence the next step.

Therefore, even the most experienced advisors lack a crystal ball for the step after the next one. Incidentally, inappropriate decision pressure in absolute tight spots is the "privilege" of unscrupulous "partners".

No, we agree on that. You can't plan everything.

But we basically know how many rooms we need. How the layout should roughly be. What size we roughly require. But details like whether you can easily build an outbuilding or not are the deciding factor when, for example, a plot is just wide enough to place the main house. We know the rough dimensions of the main house for the living area. Now it depends on the shape of the plot to say whether the garages will be attached to the house, freestanding, or something else. The roof shape also depends on how the terrain is cut. If it is narrow and you have problems with the distance to the neighboring property, then maybe a flat roof is necessary. But that only works if there is a basement where you can store things.

So, we are not driving ourselves crazy but gathering information.

's post was, for example, very helpful because I can now also look up BayBo Art. 57. And then maybe ask more focused questions.

's idea also sounds interesting. Although I do have to ask: if the trailer is not taken to the TÜV every two years, the registration expires and then possibly also the permission to park it on the property, right? Then in the end it might be a conscious circumvention of the building regulations. Apart from the fact that it sounds very expensive to buy a 25 sqm trailer.

BayBO Art. 57 contains some exceptions for energy generation systems and the like.
May I ask if it would then be allowed to build a "small house" (essentially a covered, freestanding room) in which components of the heat pump, photovoltaic system, etc. are housed? Essentially, what is normally the boiler room in the basement. Additionally, rainwater barrels as "fixed containers of other kinds with a volume of up to 50 m3". I personally would have no objection to placing 2-3 1000-liter tanks somewhere for garden irrigation. Preferably "inconspicuously". But that's just a thought that came to me while reading the building regulations. Would it then be allowed to build that freestanding and without a building permit? And if yes, directly on the property boundary or only with a distance?

without a building permit

... always sounds so tempting and easy. But the opposite is true. Without a building permit, you are solely responsible for the legality of the project. So you have to find out for yourself which regulations apply to this specific property. This is not just the Building Code, the Land Use Ordinance, and the State Building Regulations. Apart from local statutes, the BayGaV, the BayStrWG, the BImSchG, or the BNatSchG can be mentioned as examples.
You want to build a house. For that, you need a draftsman authorized to prepare building applications. He should then plan everything including ancillary facilities and either take responsibility as an exemptor under Art. 58 or have it approved by the authority under Art. 59. Then you are on the safe side.

And if yes, directly on the property line or only with a setback?

Have you read Art. 6? In NRW the corresponding provision is §6. It does not seem to be that much text. The commentary on it fills a pocket book over 150 pages thick. So many if...then clauses cannot fit into one post to answer your questions without a specific property.