To accomplish that you would need to make sure the curtain rod is at least 20 inches larger than the original window size of 48 inches or 68 inches.
Curtain rod length for standard window.
This look offers a few advantages.
This would result in all 48 inches of window glass showing when curtains are fully opened.
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First because the rod extends beyond the width of the window the curtains won t block any light when you choose to push them back.
You can find curtains in a few standard lengths.
Windows with plenty of wall space on either side can afford a longer rod and larger finials.
In traditional style the curtain rod is about 6 inches above the top of the window and it extends beyond the window 3 inches on each side.
This doesn t mean these are the only curtain lengths it s just what you re likely to find online and in stores ready made.
The most commonly sought after sizes and styles feature a 1 and 3 8 inch in diameter size curtain rod to a 2 inch curtain rod typically for windows with a length measuring between 66 120 inches.
Measure 3 6 inches 7 6 15 2 cm beyond the window frame for rod length.
The curtain will hang 3 inches below the bottom of the window sill.