Cost of architect services for prefabricated house

So I find some things more than strange. If I want to build a prefabricated house, then it's about buying one piece of house at a fixed price including all services. I do that myself as a general contractor.

What advantage would a client have otherwise. It’s not even specified here which service phases are exactly included, meaning billing can be done anytime according to HOAI.

Yes, I thought so too and have been very surprised since my first consultation about the "tricks" apparently used in this industry.

When I go through the posts here, I increasingly notice how incomprehensibly large sums are dealt with. Often, a BH is told, as here without reference to actual performance, that they have to pay commissions and architect fees for a prefab house?! I ask you, for a PREFAB HOUSE! Somehow, that must be the wrong name for it if it still requires money to be finished. I would only have a house built if I knew exactly what it would cost beforehand. A price that still grows would not be acceptable to me. That borders on deception.

When I go through the posts here, I increasingly notice how incomprehensibly large sums are handled. Often one tells a BH, as here, without reference to actual performance, that they have to pay brokerage fees and architectural services for a prefabricated house?! I ask you, for a PREFABRICATED HOUSE! Somehow that seems to be the wrong name for it if it still needs money to be finished.
I would only have a house built if I knew exactly beforehand what it would cost. A price that still grows along the way would not be acceptable to me. That's almost deception.

Exactly my thinking and therefore also my objections. For this very reason, I feel like I’m being taken for a ride.
Here it is boasted that one has already built 1000 or God knows how many houses, but when you then ask for a price, suddenly everything is totally opaque. I’m just so annoyed because I expect a precise answer as quickly as possible and don’t want to spend months researching the topic, only to find out that the house ends up costing €100,000 more anyway.

Of course, one must not forget the company's perspective.
Prefabricated houses usually have a lower market value.
The market is steadily shrinking, meaning a company must naturally
get the largest possible piece of the ever smaller pie.
But offer it "cheaper" than a general contractor or architect. Because here the
market value is higher.

As so often, the basic offer is very inexpensive, compare a kitchen unit from
advertising. As soon as you order additional items, the price quickly climbs.
After all, sitting in a show house, one already feels at home.

In conclusion, the decisive factor is the specification of services for execution and planning.
Planning in the sense that, for example, an energy upgrade often already fails
at the basic modules and, for example, required technical building services are often pushed
into the fine print. Which is then often referred to later. Large corporations finally
also have their legal departments.

In no case is the contract probably more important than here.
With a construction period of 2-4 weeks, there is hardly any opportunity to react.

However, as a client, one should also consider that everything is subject to a price-performance ratio.
One should also never overestimate own work and be persuaded to rate it very highly.

Of course, one must not forget the company's perspective.
Prefabricated houses usually have a lower market value.
The market is shrinking, meaning a company naturally has to
get the largest possible piece of an ever smaller pie.
But they have to offer it "cheaper" than a general contractor or architect. Because here the
market value is higher.

As is often the case, the base offer is very cheap, compare to a kitchen unit from
advertising. As soon as you order additional things, the price quickly rises.
After all, sitting in a show house already feels like being in your own home.

Conclusion: the bill of quantities for execution and planning is crucial.
Planning insofar as, for example, an energy upgrade often fails already
at the basic modules and required technical building equipment
is often pushed into the fine print. Which, however, is gladly
pointed out later. Large corporations also have their legal departments after all.

The contract is probably more important here than anywhere else.
There is almost no possibility to react within 2-4 weeks of construction time.

However, as a client, one should also consider that everything is subject to a price-performance ratio.
Also, one should never overestimate own contributions and be persuaded to set them very high.

Thank you for your contribution.
In the conversation, I specified in great detail what I had in mind. A price was mentioned to me. When I asked for an offer, it suddenly became a problem that I could not understand.
The house price was quoted on the base plate, without earthworks, without incidental construction costs, without cellar, without shutters, etc. etc. I have rarely felt so stupid in my life.
I have replayed the conversation in my mind again and am firmly convinced that I gave all these details.
The supplier’s response was that this is usual. But I am not interested in what is usual in the industry; I refer to the one-on-one conversation and the specified features. This really borders on deceit/fraud.
I have never dealt with this industry before, but now I have a small impression of the tricks that go on. Very unprofessional practices. I think I can say this: I had conversations with three salesmen/advisors, all of whom I would classify as unprofessional/hard sellers.

okay, the advantage of the prefabricated house is also just opening a drawer and putting together a few modules. Result price = XYZ

The foundation slab like the basement is always something individual due to the foundation or utility connections. That means planning must also be done for the prefabricated house here. Nevertheless, a cost estimate like a cost calculation should also be possible here.

Here my way is more tedious, I first have to collect the client's wishes and put them on paper as a draft before I can say A costs X, B costs Y, or C costs Z

Everything has its pros and cons. I am not here to demonize prefabricated houses. Of course, as a planner and executor, I also have my own perspective.