Inside mount blinds are installed inside the window casing.  The window must be at least 3/4" deep for inside mount blinds.  

• Measure the exact inside width of window casing from one inside edge to the other in three different places.  Record the narrowest measurement.
• Measure the exact height in three different places from the top edge of opening to top of sill.
• Do not take deductions.  Allowances are made at the factory to ensure a perfect fit.
• Always round down to the nearest 1/8".
• Measure the window on the diagonal. If the two diagonal dimensions are not exactly the same, it may be more appropriate to specify an outside mount shade for optimal light control and privacy.
• Order the narrowest width measurement and the shortest height measurement.
• Be sure the window opening is deep enough to install the mounting bracket.

• Measure the exact width to be covered.  Be sure the measurement overlaps the window by at least 2" on each side (4" total overlap) to ensure light control and privacy.
• Measure the exact height to be covered, including desired overlap (Typically from top edge of molding to bottom edge, or to sill if there is one).
• The factory makes no allowances on outside mount.
• When measuring the height, take into account the requirements for mounting the bracket attachment.