I have seen and inspected reference objects myself and talked to the clients. One, for example, they built directly behind us. The clients were very satisfied. The architect is somewhat older. I estimate about 55 years old. Office inspected. He still does everything the good old-fashioned way. He draws everything on the board. Without a computer.
Even with a very well-known prefab house manufacturer, I got a quote (Schwörerhaus) they charged about €15,000 for the architect, structural engineer, and everything that goes with it. I’m just a little surprised, please don’t misunderstand.
I have seen and inspected reference objects myself and also talked to the builders. One, for example. They built directly behind us. The builders were very satisfied. The architect is somewhat older. I estimate about 55 years old. Inspected the office. He still does everything in the good old way. He draws everything on the board. Without a computer.
I find your (merlin83) shell construction and roof costs quite low estimated - especially for BW. We also have just under 200 m² plus 40 m² usable area plus a double garage and were at 160-170 TEUR for shell construction offers and at 40 TEUR for carpenter/roofer (gable roof, two flat dormers, garage flat roof).
Therefore, I would be a bit cautious regarding the costs - for the other positions it usually feels about right.