Did you actually find many that stuck to the regs..
New build some do yes, ( depending on where you are ) as EDF inspect before they connect.Renovation and conversions, not so much IME , as EDF don't get involved.
Place going up a 100metres from me most definitely isn't adhering to any regs.The most obvious being that here everything must be connected to mains sewage or septic tank with "epandage".We never thought that the ground could be used for housing as impossible to connect to mains sewage, and not enough land for septic tank etc.
It has been approved with a "puit perdu" ( hole in the ground where the carp etc goes ).I was curious and have a full copy of the plans with the authorisation clearly marked "puit perdu", I know 3 people in the commune ( including the nearest house to me ) whose "puit perdu" had to be converted ( less than 5 years ago ) at great expense to mains sewage system connected because of "les regs".
The rules haven't changed, just the person that can authorise what gets built has.
French sockets and plugs used to be good quality, now the DIY outlets ( brico depot, leroy merlin etc ) stock the good stuff, along side the cheaper that will fall apart or short out if you look at it sideways, all carry the requisite approval markings.French Trading standards offices have been so cut back that the last time I phoned our local one ( St Brieuc ) , I was told that I now have to phone a national "plateforme", the number I was given tells you "this number is no longer in service" and gives no alternative. My neighbour ( en face ) is a recently retired trading standards and hygene inspection officer , he tells me that in most counties, including ours , there are only 3 or 4 inspectors , and no office staff.thus many places and buildings will never get checked out, unless there is a complaint, or they fall down, or someone gets poisoned by a mouldy pizza etc.
A lady further down our private road had no breaker / fuse box at all, just the leccy meter and some connection blocks attached directly to the incoming cables.EDF had been reading her meter for decades, no one was bovvered.
When we bought this house, the earth line was attached to the incoming gas pipe in the kitchen, ( gas and electric done by a "highly qualified" local artisan ) there was no other earth line.As I rewire, I'm constantly finding live cables buried in the plasterwork ( I'm removing all the plaster from all walls ), or cut off flush with it ( but still "live" ) and plastered over where sockets have been "cancelled" , and cables clipped to the walls and over doors to go somewhere else.Our bathroom had 13 amps ( socket with no earth ) available 20 cms from the hand basin and 60cms from the shower curtain, no breaker or fuse on that line at "the box". "Les regs"..they've heard of them.