@Superduner
Oh if only that were the case..The reality is that any mayor in any one of the over 30 something thousand "communes" ( towns villages and cities here ) can make up all sorts of local law ( décrét municipal, arrété municipal ) , specific to their commune. Ours for instance requires permission from the mayor ( actually it is the planning councilor../ retired music therapist in our case, who decides, the mayor just "signs off" ) for any solar panels on any roof at any height, and for any panels on the ground ( they forgot to mention "on walls" when they drew up that local reg* ), If permission is granted, they also require a "tax" of €25.00 per sq metre per year, which is added to the tax foncière. Two km away from here, in an other commune there is no charge for any panels, and no permission required for solar panels on the ground.
I used to get on well with our current mayor, ( pre-covid ) my best computer chair was one of his medical chairs, that he was replacing when he still had his lab. I voted for him. But, as happens with many mayors, as soon as they become mayor, they start spending on buildings, hiring friends or relatives, and making petty laws. He has been a major disappointment to many, he knows this is the general feeling, so he has said recently that he will not be running again, This will mean that we will get an entire new "team" or "list". In each French commune, each mayoral candidate heads a "list", if they win, that "list" become councilors. Some also become "adjoints" , which is a sort of senior councilor with special responsibilities, such as planning rules.
I'm one of many hoping for a new mayor with a new team, and some sensible rules.
*I could put solar panels up on one of our house walls now, but the only one with enough space to put two 45W panels has lousy exposure and is shaded for all but 4 hours per day even in summer on a sunny day , not really worth it on that wall. The current "rules" mean I do not need permission, but I'm certain that if I did, they'd be difficult about, or refuse permission for my extension of the atelier, they would not have to give a truly coherent reason, no mairie does, hence the use of "not in keeping".
Many people across France use EDF to do their installations of solar or heat pumps etc, in which case all the "paperwork" is done by EDF. Others ( such as one of my two neighbours, use private companies, he was unlucky and got a cowboy outfit that fitted his heat pump incorrectly and then went bust and vanished, cost him 16K, he's only used it for 3 days since it was fitted 15 years ago ). You apparently had a better experience.
One of the companies that I have "trade account" with is Asturienne ( the trade roofing side of Point P ) ..I asked them for a quote for slate a year ago.they now spam me daily with various totaly non related offers.The most common of which is that I should attend a three day course with them at Rennes, on completion of which ( and in exchange for a sum that they have not mentioned ) I would be a fully qualified Solar Installer.. "agrée " . Three days and I'd be considered as totally qualified ..you could n't make it up..c'est la France.