This refers to the way your window treatments will attach to your window. Inside mount measurements are made inside your window. You will provide us the size of your window recess and we will take deductions on the size of of your window treatment so that it fits correctly in your window frame.
For an outside mount measurement please measure your window treatment where the window treatment would exactly cover.
This way we'll make them exactly the size you order. Outside mounts can be used to install your window treatments on walls , doors, and trim.
Please refer to the measurement instructions or contact us if you are not clear on how to approach this because providing us with the correct size is essential in having a window treatment that fits perfectly.