Are the installation costs for window fitting market-appropriate?

Hello, I am of the opinion that far too little information has been disclosed here to be able to make a well-founded statement. Do you mean, for example, "window sheets" as window sills? Then it also depends on the wall structure; with a "sensitive ETICS" made of wood fiber insulation boards, window sills are essential for a lifespan > 5 years for the house. From my own experience: they are really expensive then! With insulation wedges + second water-conducting level etc. including installation, it quickly adds up to €300 per running meter! Of the 5 Venetian blinds, we also don’t know if they are 30 cm wide and 1 m long or 4 m wide and 280 long? What now? Just post the complete offer anonymously ...

This is how our offer is composed. Including 4m lift-and-slide door, venetian blind on the ground floor, roller shutter on the top floor, aluminum front door including side panel and garage door. Windows are anthracite PVC from Weru.

Our current window offer for a total of 24 windows includes installation costs of 3,350 Eur net.