External construction supervisors Berlin / Brandenburg towards West

Hello, we are looking for an external construction supervisor who is active in West Brandenburg? Should one rather take one from Derka or a freelancer?

We are building a single-family house with a company that is not very big.
Thank you for your help

Bauherren-Schutzbund already known? Lawyers (for checking the construction service description/contracts) and construction supervisors are offered there at fixed prices. We are also members there and very satisfied with our construction supervisor (North Berlin).

we also had that with the Bauherren-Schutzbund, checking the contracts by the lawyer and construction supervisor, Berlin East

Hello,
we are currently also looking for competent and independent construction supervision by an expert.
Important to us are:
* Review of the contract and the scope of construction services for possible “traps” in the area of prefabricated house construction before concluding a service contract
* Supervision of the construction and inspections during the construction phase, as well as interim and final acceptance(s)

Question 1) Are there concrete recommendations for the postal code area 15…
Question 2) How does it work, for example, with the already mentioned [Bauherrenschutzbund]? Do I have to become a member here (for a fee) and can then accordingly access appropriate experts (also for corresponding costs depending on the service)?

Thanks in advance for your help!

* Examination of the contract and the construction performance description for possible "traps" in the field of prefabricated house construction before concluding a contract for work * Accompaniment of the construction and inspections during the construction phase, as well as intermediate and final acceptance(s)

From my point of view, these are two lots; a lawyer is better suited for one, and for the other you need a technical expert. In postal code area 15, well, I'll call into the thread for you ;-)

The mentioned association has an online map with the experts. Search for one nearby (short distances, quick availability) of the construction site and call to arrange an appointment with you. You will clarify everything else at the table. We have purchased contract reviews and construction supervision (all together about €3,000).