A little error slipped into my message. (It was over 20 years ago that I was involved in doing this.) Where I mentioned the official Conseil inspector, I meant, of course the Consuel inspector. This is the geezer who will give you the chit necessary, by law, to connect your new installation to the public supply. We had to have it for a new house, or EDF wouldn't connect us (before ERDF existed). Apparently, you're supposed to have it for a major electrical renovation as well.
FYI, if you haven't heard of it, Consuel stands for Comité National pour la Sécurité des Usagers de l'Électricité. We had to wait nearly 3 months for them to turn up, although at the time they had a commitment to turn up within, I think, 3 weeks of applying. How was this done? You were only allowed to apply on their official form & they simply delayed sending that out!
Hoping I'm not teaching granny to suck eggs, but others reading this might find it helpful if you're already on top of it. More info about the Consuel is on here, which happens to be a French equivalent of Meerkat comparison sites.