House purchase, prefabricated house from the developer with land

If you refer to advertisements directly from house providers (whether prefabricated house or solid construction), I would like to share with you my many experiences from last year, which, however, do not have to be representative:

You are now confusing house providers and their offers with the actual developers. The developer offers do exist. They sell you both AI.

There are bundled offers, there are house providers who offer their house and offer a plot of land as an option, and there are developer offers, mostly to be "recognized" as row or semi-detached house offers, but they also build single-family houses, usually in a group. Whether you inquire directly with a developer is up to you. However, developers usually have everything handled commission-free through agents because they want to have little to do with the mediation,

There are already other threads here in the forum. It seems to work like this: the prefabricated house providers advertise a plot of land, but only tell you about it after you have signed a contract with them. In the end, the advertised plot usually doesn’t even exist and they offer you worse ones instead.

That's how I experienced it last year as well, except for your distinction between prefabricated houses and solid houses. The company that wanted to sell the plot we had already purchased notarized along with their house was a solid house builder.

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Much more common is the case that a house provider - unfortunately not bindingly available to him - uses foreign plots of land to deceive interested parties into believing that a building contract is ready to be signed, including the required existing land.
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Thank you, you put it much better than I did. It was very important to me to warn the thread starter. Depending on how urgently one is looking for a plot of land and how little experience one has with this environment (the sellers are often "good"), the easier it is to be deceived.

I am skeptical of these tied offers based on my own experience.

there are developer offers, usually recognizable as terraced or semi-detached house offers, but they also build detached houses, mostly in a group. [...] Mostly, the developers have everything run commission-free through agents because they want little to do with the brokerage,

You have now addressed three aspects: 1. yes, an offer can definitely be a serious developer offer even if, atypically, it has no siblings on neighboring plots or is actually a single unit. 2. yes, even for two separate parties there can be the quite banal operational reason that the part "land procurement and brokerage" is practically better placed with an external specialist (agent) than in an internal sales department. 3. in my opinion, there is nothing against actual tied offers (= the plot is available a) concretely, b) the provider as owner or also contractually secured has the decision-making power that the customer can also become the buyer of the plot and c) the shown house is planned for or suitable and approvable for this plot), because here any tax advisor freely chosen by the customer can clarify what tax-related dimensions this tied business can have. On the other hand, I find increasingly common pre-sales objectionable, which in my view is very close to the criminal offense of fraud: in the not uncommon worst case, the house provider has originally discovered point a) (the plot) in a third party's sales offer, to which b) they have no contractual relationship, i.e., they have burdened the plot with no right that would grant them (co-)decision or at least a proposal right regarding a buyer person – and often the owner has therefore already sold the plot to someone else when the interested party reads the house provider’s offer; c) in such cases, the land area is often simply multiplied by the floor area ratio and without clarifying building envelope and other conditions, a model of suitable size is chosen from the portfolio, which is used as a price example. In such cases, therefore, it is objectively impossible to satisfy an aroused interest of the prospective homebuyer in three out of three points – without the magic word "subject to change" this would fulfill the offense of fraud. That is what I mean when I say that Eduard "XY" Zimmermann would turn over in his grave every time for such offers.