Land planning - which house type/size is most sensible?

I would address the dog issue politely.

I would too. Or invite the neighbors for coffee on the terrace when it especially stinks... no, seriously. They probably don't even know. People who communicate get help.

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But just doing that without asking... is not okay.

We have been living there for almost 3.5 years and our neighbors for almost 3 years. Shortly after they moved in, the landlord sold the house and the rich snob bought it. At first, he completely modernized the 8-year-old house and then had the garage built. He asked the tenants beforehand, who said they didn’t want a garage. But he just did it.

So if he doesn’t even take his tenants seriously, he probably won’t do it for us either.

It’s pretty harsh that 613 sqm is not enough for storing excavated soil.

One general contractor didn’t point that out to us at all. The second said that with 389 sqm, the excavated soil can’t be stored on the side and would have to be transported away immediately. Costs about 2k.

I would address the dog issue politely. You can say something like: "It’s a bit awkward for me, but I have to bring something up.

We are always polite

Our dog also kept messing at the neighbor’s without us knowing. At some point, the neighbor told us

We have already said that the dogs have been messing in the garden, they always pick it up too.

The landlord wouldn’t have to “make sure” that the dogs can’t get over there, would he?

We put up a fence right at the beginning of the renovation because of our dog. So that the dog doesn’t run over and leave unnoticed little piles behind. We informed the neighbors about the fence beforehand and about the rough schedule of the renovation (topic noise).

So definitely put up a fence and talk to the neighbors about the bins. Would there be another place for the bins?

And the garage can be nicely improved, as mentioned.

Bold decision! We sold our house directly. We don’t regret it for a moment in our situation. That, of course, makes the decision to build new much easier. But your reasons should mostly become clear, and the land itself is certainly a good investment for your children!

Would there be another place for the bins?

Honestly, I can't think of another one.

But how do you dispose of dog poop without leaving such smells?

Brave decision!
We sold our house right away. I don’t regret it for a moment in our situation either. That certainly makes the decision to build new much easier. But your reasons should mostly clarify themselves, and the plot itself is definitely a good investment for your children!

I'm very happy for you!! Exactly that thing with regretting it weighs so heavily on my husband..

Our daughter will surely be happy when we tell her in 15 years that she can build right here with us ..

Not at all. It has to go in the residual waste bin... of course, one could ask them to put sturdy plastic bags around it (the dog poop bags are very thin and in my opinion hardly block any smell).