The first and most costly mistakes are already made during the planning phase. It is not uncommon to submit faulty bids or bids that are not understandable. Planning offices generally fail to provide clear answers to detailed queries since the requisite knowledge on networks is often lacking. Pay close attention to the section on network and communications if a tender is involved.
It is fairly common to forget during initial clarifications to set up the system on an existing network or infrastructure (rack, cabinets, switches, cabling, etc.) at the customer. An appropriate examination can save unnecessary costs.
Provided of course that the customer's infrastructure meets the same requirements for reliability, performance, availability, expandability, IT security, etc. as described in this document. If new networks are unavoidable, it makes sense to consider topics such as digitalization, cloud solutions, scalability, and flexible administration using virtual and easy-to-administer networks.
Building automation and control systems do not play a significant role here.