Our site manager is great. He is also perfectly familiar with the latest DIN standards and ensures professionally perfect execution and a well-managed construction site. He has been working with the construction companies for more than 20 years, and all these companies continue their professional development and are always up to date. I have absolutely no worries there. Although, for example, we are doing conventional construction, our electrician is also very well versed in KNX, etc. Our site manager, for instance, requires us to commission a geotechnical report. So everything is perfect.
Unfortunately, we have experienced that many companies, when you ask a bit more, always say they have "always done it this way" or "You are only building a single-family house." With that sort of attitude, the site manager would have no fun with us, or we with him.
But in the current setup, with a personally liable site manager hired by us with over 25 years of professional experience, I have absolutely no problem. He has free rein.
And the best part, 1-2 percent cheaper than the babbling construction companies. By the way, we are now building with an engineering office with architects, structural engineers, and civil engineers and commission the companies directly (or our site manager himself). But only companies that have been working with the engineering office for many years (including no exorbitant prices for additional requests and a cooperation based on mutual trust).
I must revise one statement, of course. If I had worked with this engineering office from the beginning, they would have also created a great floor plan for us, and we would have saved a lot of stress. So by now, I am in favor of LPH 1-4 per architect (but not just any architect: our engineering office has already supervised hundreds of houses).