Electric billing - based on which principle?

Especially if you take care of it. Ask around in the new neighboring district. Who knows someone? Then call and say: You were recommended to me by xy. If you are also flexible with appointments, it will work out. The apprentice pulls the wires, installs the boxes, and the journeyman connects and checks afterwards. Always have coffee and cake ready and give a tip. Then everything runs like clockwork.

If the electrician thinks as entrepreneurially as was partially demanded here by the OP, then he will also be available and everyone is happy. Until the OP has a replacement, there are two losers.

Dunning-Kruger effect, I can't think of anything else. As far as I have noticed here, you recently bragged about a follow-up financing... where do you get the expertise and make such claims? In fact, there are one or two craftsmen who are not fully booked.

yes and? one does not exclude the other. I need a professional from time to time. I had 5 sockets to be installed because I don't touch electricity. No one just comes. Nobody shouts "here, come here, I'll install your sockets for free" They charge for travel, small parts, tools, an apprentice comes along. If I remember correctly, the OP wanted 4 sockets. 4 pieces! For that, Elli has to block half a day for 100 € or whatever??? He would rather do a large order in that time. He also has setup time there.

Since I still have to deal with this topic, it seems that there are different approaches.

If the general contractor electrician calls out prices that are beyond reason, it makes sense to have the sockets included in the package optimally installed in order to later multiply the sockets through your own electrician. If I have understood this correctly here and according to my research, multiplying the sockets is rather easy? In addition to the original socket, further holes are made for the plastic inserts and connected from the 1st socket by a bridge? How is it then with the protection? The first electrician will surely only provide protection for his work, or is it more or less irrelevant how the individual sockets are expanded, because the protection is already designed in such a way that nothing can happen and is sufficient?

If sockets are needed in addition to the general contractor package and positioned in places where none from the package are used, it certainly makes sense to commission the general contractor electrician for this, in order to pull cables, mill, and everything related, rather than have your own electrician do such probably more complex work?

Any other thoughts on this?

What is a reasonable price if you expand a socket from the package to xy slots? So from a single to a double or triple. Or is this "expansion calculation" rather something special or normal? How was it done by others here?

Thank you!

Since I still have this topic ahead of me, it seems there are different approaches.

If the GU electrician calls for prices that are beyond good and evil, it makes sense to have the sockets included in the package optimally placed, so that later on your own electrician can multiply the sockets. If I have understood this correctly here and according to my research, multiplying is rather easy? In addition to the original socket, further holes are made for the plastic inserts and connected from the 1st socket via a bridge?

Correct. With the sockets, it is actually irrelevant where exactly they are positioned in the room if you have in-floor electrical wiring. You can simply lay the new cable along the edge between screed and wall.

How is it then with the circuit protection? The first electrician will surely only provide the protection for his work, or is it more or less irrelevant how the individual sockets are extended because the protection is already designed so that nothing can happen and is sufficient?

In 99% of cases sufficient. If you want an extra protected socket, I would have that done by the GU electrician. 80-110€ is reasonable for something like that. For example, in the kitchen – nowadays there is often a cooking island. In the past, stove/oven were always together. That is usually still in the contracts. If you plan a cooking island, you can safely plan the extra 100€ for it. If you plan an electric fireplace in the living room, I would also have that socket individually protected.

Should sockets be needed that are in addition to the GU package and positioned in places where none from the package are used, does it certainly make sense to commission the GU electrician with this, for pulling cables, milling, and everything else connected with it, in order to save your own electrician from such – probably – more complex work?

It depends on the price your electrician calls. As described above, it is not particularly bad to install new sockets as long as painting/flooring work is still pending.

What is a reasonable price if you expand one socket from the package to xy socket outlets? For example, from a single to a double or triple. Or is this "expansion calculation" something special or normal? How has this been done by others here?

Personally never heard of it until now. I know 2 variants. a) Increasing the number of sockets in the room. Up to 30€ I find personally reasonable. But up to 40€ is quite common. There you simply say where the sockets should go and every socket costs the same. b) as described above with the examples of the fireplace or stove/oven. There the cable is laid from the socket to the distribution box and separately protected there.

An expansion by a few [cans] is completely normal and usually still inexpensive or free of charge at the time of purchase. Later it becomes more expensive.