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To change the cable section on your main line, you're looking at between 300 and 800 euros depending on your electrician and your region, since you have to work on the entire installation and not just swap out the wire!
It's a job that takes time because you need to pull the new cables through the conduits, redo the connections at the circuit breakers and everything else.
If you just need slightly more power, it might be worth getting three quotes to compare prices, because honestly it can really vary from one electrician to another!
The price range they're giving you is a good ballpark figure, but the actual cost really depends mostly on what your current setup is like. If your circuit breaker and meter can handle 10mm², the electrician will just swap out the cables - it's work, takes a few hours. But if you also need to upgrade the circuit breaker or the protection systems, you're easily looking at 800 bucks or more.
What makes a big difference too is whether your installation is easily accessible or if the cables are buried in the walls. I had friends who paid way less because everything was visible, others who ended up having to break through plaster everywhere. The region matters too - hourly rates vary quite a bit between rural areas and big cities. I'd suggest you call two or three electricians for quotes, it's free and you'll quickly see who adjusts their price based on your situation.
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