My general contractor is currently charging 70€ per empty conduit ending in an empty box. This involves a two-story semi-detached house in the countryside. How and when did you lay the conduits yourselves? Were there no objections from the general contractor regarding delays in the construction work?
I laid the empty conduits after placing the slab ceiling elements and before the in-situ concrete was poured. There was no delay; the slabs were installed on Friday in coordination with the general contractor and the concrete was poured on Monday.
The way it’s usually done:
On one side into the ceiling breakthrough, on the other side either into the ceiling box (light, smoke detector, presence detector) or a hole drilled so that you can then reach down in the wall chase.
For the holes, suitable tools are recommended. I bought a Bosch rotary hammer in the 6kg class for this, costs 500€, which I had wanted for a long time anyway.
With the conduits, you quickly rack up meters. But to later still get an empty box attached, it takes at least as much work again:
Drill the box, chase with a wall chaser, chisel out, plaster the box in:
All in all, not for someone with two left hands!