Rule Third: Correct configuration correctly!
Very often the cost of the window depends on the configuration and some main structural elements. So, for example, you should not order a multi -chamber profile or double -glazed window for a balcony if it is not used as a dwelling. The correct choice of configuration will be very common to stop the main source for saving. In addition, we must not forget that the number of opening wings, as well as the mechanism that allows them to open, often affects the cost. Therefore, it is worth considering in which cases you can exclude the presence of windows.
Source of information: Ramnah