Salamander / Brügmann BlueEvolution Windows

To avoid "successful operation, patient dead": there are window sellers who send subcontractors to install; they somehow bang the windows into the house, afterwards the windows are installed and the reveals are pitiful, and there were foam parties. Good installation begins with proper measuring. From this it necessarily follows that only one offer can be derived from the plan and that with the order, the actually existing shell must be awaited.

I would advise every builder to invest the 54€ in the purchase of the "Guideline for Planning and Execution of the Installation of Windows and Front Doors for New Construction and Renovation" by the RAL Quality Association. It basically contains everything. You might even get it second-hand (current version from 2014).