I can only contribute one thing: New building, shell construction condition, in the countryside. No electricity, cables freshly laid, screed fresh. Thunderstorm in June. Damage: Over 8000 euros. Trades, above all electricians (60 years of experience): lightning strike in the shell construction - we have NEVER experienced that before... The matter has been dragging on with repercussions until today. I am for anything that could help even remotely... you learn from damage...