What does the installation of a roof window for a prefabricated house cost?

Hello, we have just moved into our prefabricated house and now want to make some structural changes under the roof. Specifically, it is about installing a second roof window between two rafters. It should be a simple model without any frills, normal size and, as mentioned, between the rafters. Before we ask the BT, we would like to know what a reasonable price for this would be. We live in Bavaria, so prices in euros ;-)

Around €450 to €600 including installation for an approximately 60 x 80 cm window. However, the developer will - that is the developer's profit - include a markup. So rather calculate with €600.

We looked at some roof windows at Engeser Fensterwelt, and the prices ranged between 600 and 1,000 euros, depending on the material and glazing.

There are also price differences with these roof windows. It depends on the material and the frame. Then the glazing also plays a role. We have a holiday home in Germany and there the roof window including installation cost about 850.00 euros.

I also think that up to 1,000 euros should be calculated here for a roof window in Germany. But installation should be included in this price.

Without installation, our last roof window cost 350 CHF. I then installed this roof window myself. It also had the same dimensions as the old roof window,