Measuring for INSIDE
Measure the width top, center and bottom, recording the narrowest width. Measure the height left, right and center recording the shortest height. When you specify inside mount, we will make your blind slightly smaller than specified to allow for operating clearance. We will deduct between 1/16" to 3/8" from the width on each side, and 1/4" to 1/2" from the height. For a flush inside mount (the blind completely recessed so the top of the blind does not project out of the opening) check that you have enough depth.
Measuring for OUTSIDE
Measure the opening width. If there is room, add at least 4" on each side of the window opening to ensure minimum light gap. Measure the opening height. Add a minimum of 2 1/2" in height to allow for mounting brackets above the opening and add your desired overlap for the bottom. If your window treatment will hang down to the floor, please allow at least 1/2" clearance on the bottom for proper operation. If you specify an outside mount, we will not take any size deductions - your blind will be made at the exact size you specify.