There is an official price list from the manufacturer....does he not have to justify why he charges so much more?
Also, if I had done it in writing like: Please take these and those tiles and I assume they are cheaper.....if he then gives me a bad price, am I supposed to change the roofer...that’s not possible either....
It’s just not nice when you have to record everything in detail in writing beforehand, no changes are really possible anymore, and you get ripped off like a Christmas goose....but apparently that’s how our law is?
From now on, I do everything only in writing. Everything.