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.
Curtain rod length for standard window.
When installing curtain rods hang the rod so that it extends at least 3 or 4 inches beyond the window on each side which allows your curtains to overlap both the window and the wall to prevent light from leaking in around the window s edges.
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.
Measure 3 6 inches 7 6 15 2 cm beyond the window frame for rod length.
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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.
Windows with plenty of wall space on either side can afford a longer rod and larger finials.
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.
Also the hung curtains will completely cover the window frame.
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.
This would result in all 48 inches of window glass showing when curtains are fully opened.
You can find curtains in a few standard lengths.