For Wall Mount Heavy-Duty And Decorative Traverse Curtain Rods: The
Return measurement is the distance from the wall to where
your fabric will be hanging. It's important to remember that
this distance is not always to the actual center of the drapery
rod. Return is frequently confused with the clearance measurement.
Clearance represents the space from the wall to
the back of the drapery rod and is used to determine if you
have room to install a second layer of fabric underneath.
Most brackets allow for on-site adjustment and are frequently represented as "3 1/2" to 4 1/4" Return". A Return measurement is not required for ceiling mount rods except under special circumstances like bay windows.
Most curtain rods have Return options up to about six inches.
If you need more than that, then you’ll have to create
your own solution with the help of a drapery installer
or general contractor.
One of the easiest workarounds is to install a block of wood, painted your wall color, and use it as a spacer block. Make sure the wood spacer block is installed properly as it will be required to bear the weight of your treatment.