Thank you
As long as all is done before the kitchen arrives 13-04 ...

Adding a new socket will need a new conduit.
Possibly better to look at multi-sockets. (Ikea or Darty or Leroy Merlin or Castorama or supermarkets). Castorama is part of B&Q company.
In the UK, I have added sockets by piggy backing onto adjacent sockets but it doesn't work like that in France.
There isn't a ring main.
You could ask your electrician what the load is on each circuit breaker.
I recently needed to replace a bulb in my oven but switching off the breaker marked "oven" didn't switch the oven off.
I found the correct breaker by trial and error which served the oven + microwave + fridge/freezer.
HTH

When my house was rewired it did not have a decent earth so a couple of extra earthing posts were put in.The wires were pulled through the existing gaine with me pushing it through and the electrictian pulling.All the switches and plugs(all were doubled) were renewed as was the tableau.One point-I believe that french regs state that there must be a minimum of six plugs in the kitchen-or 3 doubles but we went for eight round the worktops to be sure plus there were others in the wall anyway

When we last upgraded we used the double sockets that fit into a single wallbox that one finds in France but not in the UK. Our installation now needs a total overhaul because of its age and as you say some extending.

Agree with you that one should plan for many more power points than one thinks that one needs, especially in a kitchen.

By modern standards, IME (not in France) even houses built as recently as the 1980's have pitifully few sockets. When I rewired my home (in London) I installed a socket (almost always a double) near every corner of every room, plus half way along the long walls, and also dedicated sockets next to where the TV, VCR/DVD, and hifi were located (the TV was bolted to the wall and I ran a cable up to a socket next to the TV and the shelf underneath for the VCR/DVD). In the kitchen there were sockets behind the counter about every 50-60cm (it was only a very small kitchen about 2m x 2½m, so three on each side - the end was where the sink was located).

See https://fr.wikipedia.org/wiki/NF_C_15-100 for an overview of the regulations, including: Legrand's interpretation is available at https://www.legrand.fr/pro/normes-et...uivez-le-guide

Some really valuable information here. Thank you.