There is no concrete price! He just wanted to illustrate to me that it can become significantly more expensive. I think it's good that we don't have a company that tries to sell us every little thing and in the end, the budget is massively exceeded. It would be helpful if someone had built something like this themselves or knows a window manufacturer. The whole speculation doesn't help much either. He wanted to do some more research and say more about it at the next appointment. I just wanted to inform myself in advance elsewhere. It's okay that it's more expensive, but how much that would be is interesting. Not just a number thrown out there...