Planning / Architect, involvement of specialist planners for the approval plan

Hello everyone,
our architect would like to involve HLS and electrical engineers as specialist planners for the approval planning. He explained it by saying that, for example, the structural engineer needs to know what will be embedded in a concrete ceiling.
But I don't have an electrician or sanitary company yet. The tender is still to come. For me, this presents a classic chicken-and-egg problem.
How is something like this usually handled?

Thanks for your help.

Specialist planner is not the same as the executing company

Thank you for your reply!

Ok. Understood so far. But it wouldn’t be entirely wrong if I also let the executing company do the planning, would it? We are talking about a single-family house, so I’m not sure if I want to get myself a TGA.

I can understand that well. Usually, a specialist company can also do that with their experience. But you are somewhat right about the chicken and egg problem. Every planner costs additional money. But the structural engineer should, from experience, know what should go into the concrete slab. Or the architect could also know it. But they prefer to give the task to someone else.

Electrical installations on the concrete ceiling should be fairly irrelevant since there is hardly anything significant lying on or built up there. Controlled residential ventilation pipes are a different matter; that’s why I have already had the system planned before the mat plan, so that the structural engineer is informed.

It is better if planning and execution are separated. There are also special planning offices that focus solely on planning. Whether this is worthwhile for a single-family house, in my opinion, depends on what technology is to be included.

Best regards
Dirk Grafe