I have a new home we just moved into with Andersonn 200 double hung and Anderson 400 casement series windows. We built a custom high end home.

When measuring for blinds we noticed that the casing on the double hung windows only extended out from the Anderson frame by 1/4 inch. The Anderson frame is 1 1/4 inches. The builder said this is the way Anderson windows are hung and we will need to hang outside the frame blinds.True or False