Measuring For Decorative Drapery Hardware
Measure the width of your window treatments, taking into account if you want to mount hardware on the wall or directly on the window trim.
Allow 1 1/2" - 3" on each side of the window for when the drapes are completely open.
Be sure to consider extra wall space needed for decorative finials, as the rod dimensions do not include additional width added by each finial.
To make the windows appear larger, mount the curtain rod 6" above the trim and allow the rod width to extend 3" beyond the window's actual width.