Temporary power supply - What costs are involved?

So with us, the construction site power box (rental) cost a flat rate of €180. The meter and connection at EnBW, I believe, something around €450. Additionally, the consumption of about €250 including the screed program.

A new construction connection box costs about €1000. You always need an electrician to have it connected by the energy provider.

As already mentioned, I got a construction power box myself for a small price and then had it connected by the energy provider. Maybe you can explain exactly again which documents and applications have to be obtained/submitted by the builder with the help of the electrician? Just for completeness. I think I only needed one document that confirms that the construction power box is in order and meets the state of the art. In this case, a lot of money can be saved since the box can be resold after use and hardly loses any value.