Problems electrician due to reinforced concrete

Hello,
all our walls are made of reinforced concrete. So the electrician has a lot of work creating the grooves and holes for the cables, boxes, switches... Some holes have a diameter of 6cm. Some empty conduits are also present, through which the old cables were routed. However, the electrician says they are not usable because the diameter is too small. Since we want more sockets overall and also LAN cables in some rooms, too many cables would have to pass through the existing empty conduits, and for the new boxes he would need a diameter of 80mm. Is all this normal? Or can you ask that at least some of the pipes and holes be used after all, for example where no socket is being added, the cables should still fit through the pipe, right? Or does that seem petty? In total (it’s a large house), quite a lot adds up if everything has to be newly drilled/milled/chiseled out...

Thank you very much for your tips!

Sounds like a planning error. If there is not enough space in the designated pipes, they simply have to be chased. Laying part in the chases and another part in the pipes seems pragmatic at first glance, but overall it makes everything more confusing and complex than necessary. I would then lay everything in the chases as recommended by the electrician.

ok thanks for the answer! I forgot to write above that the house is from 1966. So for the needs at that time, the planning was probably appropriate.

I forgot to write above that the house is from 1966. So for the needs at that time, the planning was probably appropriate.

Then it is certainly not a planning error, but a common renovation challenge. Nevertheless, I would use the new slots.

Thank you for the advice.

All walls, including the interior ones, are made of concrete? Apart from the fact that it is a huge amount of work to cut grooves there, it can also be structurally problematic. Someone knowledgeable should have a look before the electrician starts. I would probably try to do as much as possible via the floor, which makes the grooves correspondingly shorter. For walls with a lot of installations, one could also consider a [Vorbauwand].