I understand better how they managed to do that in 32 man.hours... According to the current prices for materials and the hour rate these guys must get, this invoice of 6793 € looks very overinvoiced ! No surprise why we have so many phone calls every day for similar offers !
Knowing the French system, I'm sure that nobody will ever check if the invoices are realistic before paying...
My ex-wife also had her attics insulated thanks to this offer. Nobody checked if it was sensible to do it: I already had insulated these attics with 32 centimeters of fiber glass a couple of years ago !!!
As François Hollande used to say: 'no worry, the state pays for it'.
I'm pleased that you took advantage of this offer. But my common sense can't help thinking that this type of offer is not fair in a country which :
- has not enough money for improving the health system, the vehicles of the police, pay decent pensions to some people, etc...
- has a national debt of 2500 billions euros (35000 per person)
It has already been said here that the taxpayer will pay for that... In fact, it will mainly add to our national debt on which we pay interests yearly: at the moment, the overall income tax is not enough for paying these interests !
These insulation works don't require high qualification. France pays a lot of benefits to unemployed people and we import workers from Moldavia !
My last thought is that they insulated your garage with polystyren which is highly flammable. According to our safety regulations, it should be covered by non-flammable stuff. Mind your insurance policy !